ESET Research white papers

TLP: WHITE

How I (could’ve)stolen yourcorporate secrets
for $100

Author:Cameron Camp
Contributor:
Tony Anscombe
April 2023

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How I (could’ve) stolen your corporate secrets for $100

CONTENTS
Executive summary  .
Getting started  .

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Details of routers acquired  .

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Customer data  .

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Third-party data  .

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Trusted parties  .

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Extensive core routing information  .
Trusted operators  .
What’s the risk?  .

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The human element  .
Third-party trust  .

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Specific applications  .

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Trusting e-waste disposal companies  .

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Who is really telling the truth?  .
Industries impacted  .
Notifications  .

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What other devices might have secrets?  .

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Best practices and guidance  .

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How should you dispose of your routers?  .

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Should you engage a data disposal or e-waste service?  .
What if the device is “dead”?  .

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What if the previous owner’s information is on a secondhand device?  .
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What if you already have unsecured routers somewhere “out there”?  .

Potential further research  .

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Conclusion  .

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How I (could’ve) stolen your corporate secrets for $100

LIST OF TABLES
Table 1. Routers obtained for this research  .

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Table 2. Accessibility of uniquely identifiable network configurations  .

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Table 3. Overview of the companies identified from the nine easily accessedrouter configurations in this study  .

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LIST OF FIGURES
Figure 1. Sample of routers purchased for this research  .
Figure 2. A Juniper SRX550 router  .

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Figure 3. Extract from a Juniper SRX series configuration  .

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Figure 4. Extract from another Juniper SRX series configuration  .

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Figure 5. CompactFlash card storage slot on two Cisco devices (lower) andthe Fortinet Storage Module (FSM) slot on a FortiGate (upper)  .

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TLP: WHITEEXECUTIVE SUMMARY
There are well documented processes for the decommissioning of hardware, yet ESET researchers
found during a period of discovery and extensive analysis that core routers, the kind that are likely to befound in corporate networks, are often not wiped clean before they are decommissioned and offered
for resale. This leaves critical and sensitive configuration data from the original owner or operator
accessible to the purchaser and open to abuse.
Results reported here show that a majority of the secondary market core routers sampled contained
recoverable configuration data from their previous deployments, replete with sensitive, and evenconfidential, data. This allowed ESET researchers to identify devices previously used in a data center/cloud computing business (specifically, a router provisioning a university’s virtualized assets), a
nationwide US law firm, manufacturing and tech companies, a creative firm, and a major Silicon Valleybased software developer, among others. Obviously, these industry sectors were just the “luck of thedraw”; such a profusion and array of victims suggests that many organizations – including some thatreally should know how best to handle such tasks – do not have reliable decommissioning processes inplace, or perhaps place undue trust in their managed service providers or e-waste contractors.
The results of unreliable or incomplete decommissioning of such devices could be catastrophic for an
impacted organization. We found, among the networks represented by the functioning routers wepurchased, that 56.25% contained trivially accessible and sensitive corporate information. Among those
identifiable networks:• 22% contained customer data
• 33% exposed data allowing third-party connections to the network• 44% had credentials for connecting to other networks as a trusted party• 89% itemized connection details for specific applications• 89% contained router-to-router authentication keys
• 100% contained one or more of IPsec or VPN credentials, or hashed root passwords• 100% had sufficient data to reliably identify the former owner/operator
Much of this information would be very useful to anyone planning an attack.
Equally concerning was the difficulty the team experienced during the disclosure process whenattempting to contact the companies concerned, to disclose that our researchers were in possession ofa device with the company’s sensitive network configuration data.
On many levels, this research is about human error compounding to create a potential breach, and themitigation steps companies can take to reduce or avoid such pitfalls moving forward.

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How I (could’ve) stolen your corporate secrets for $100

GETTING STARTED
Cybersecurity literature and popular media contain many studies and cautionary tales of secondhand
computing equipment being found for sale with the previous owner’s data – often of a very personaland sensitive nature – still intact. These studies have consistently shown that a majority of used hard
drives [1] [2] [3] [4], USB flash drives [5], SD and other memory cards [6], and mobile devices such as
phones and tablets [7] purchased secondhand have had no, or very incomplete, data wiping procedures
applied to them before being offered for resale.
One might hope that these well-publicized studies – which have looked mainly at preowned consumer
devices – would lead to a heightened sense of awareness in general, and especially among systemadmin and security staff disposing of used corporate equipment with storage functions, and whose
configuration data can contain the keys to the (virtual) kingdom.
Such optimism, sadly, is often misplaced in cybersecurity circles…
Musings such as these, though, were not the inspiration for this research. About a year ago we set
up a lab for testing real-world attacks against multiple attack surfaces like RDP, Microsoft Exchange,
industrial control systems (ICS), and others. While sourcing equipment, we chose devices that would
most closely mimic typical current production environments for a representative test, including corerouters typical of organizations of various sizes. Generally, these would be a generation old, but stillsolid, well tested, and very widely deployed in current environments across the globe. Further, they
are a class of device that is commonly available at bargain basement prices in the secondary market(US$50–150). To test variants, we selected multiple brands and specific equipment types most suitedfor corporate use.
Much to our surprise, we found, as we staged the lab and these devices started to arrive, that many– notably core routers – still contained sensitive information. This raised a great deal of concern.
For instance, the very first core router we received originally belonged to a reputable, major, Silicon
Valley-based, household-name software vendor with a global footprint and contained such sensitive
corporate data.
This surprising discovery temporarily diverted the path of our research – we branched out to investigate
the prevalence of sensitive corporate network configuration data being, presumably unwittingly,
available for sale on the secondary market. To determine if this initial finding was a one-off, we beganprocuring more device variations, as used in different market segments.

DETAILS OF ROUTERS ACQUIREDOur budget allowed us to obtain 18 routers, covering a range of models from three of the big vendors inthis space. Once received, all devices detailed in Table 1, with some pictured in Figure 1, were kept in asecure location and were never connected to the internet, or any network.
Table 1. Routers obtained for this research
Manufacturer

Device type

Number

Cisco Systems

ASA 5500 series

4

Fortinet

FortiGate series

3

Juniper Networks

SRX Series Services Gateway

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Figure 1. Sample of routers purchased for this research

And there were also a couple of 2U devices like the one in Figure 2, which weren’t in the rack for theprevious photo.

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How I (could’ve) stolen your corporate secrets for $100

Figure 2. A Juniper SRX550 router

Of these 18 core routers, and despite them all being advertised as fully functional, one was deadon arrival (when powered on, the fan spun up but there were no indicator lights and no accessible
console). As we initially had decided not to make any heroic efforts, such as data recovery or forensic
investigation, we have eliminated this device from our remaining results, although perhaps simply
replacing its power supply might have rendered it bootable, and if so, it seems likely that would haveresulted in the configuration data – which was present when the device “died” – becoming accessible.
Using only standard operating system commands, and utilities supplied by the device manufacturers,
we discovered that two devices were a mirrored pair from a cluster configuration, failing over to eachother. Of the remaining 16 routers, two were more heavily protected than the others, only disclosing
the internal and external network IP space; thus, we were able to extract nine (56.25%) complete, uniquesets of previous configuration data from those devices. The remaining five devices contained no triviallyextractable configuration data, appearing to have been cleaned via their standard device-specific “wipe”
procedures. Table 2 summarizes our results after removing the dead router and one of the mirrored
routers; assuming that the functional devices with no readily recoverable configuration data were allfrom different networks, the 18 original devices represent 16 unique networks.
Table 2. Accessibility of uniquely identifiable network configurations
Network configuration status

Number

Percentage1

Complete configuration data available

9

56.25

Wiped properly

5

31.25

Hardened2

12.50

Dead (no recoverable data)

1

N/A

Second device in mirror pair

1

N/A

No procedures or tools of a primarily forensic or data recovery nature were ever employed, nor were any
techniques that required opening the routers’ cases.
1 Percentages are based on the 16 functioning devices with unique network configurations.

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How I (could’ve) stolen your corporate secrets for $100

In all nine of the networks from which we recovered configuration data, that data allowed us toascertain with very high confidence the previous owners of those routers. Table 3 outlines somecharacteristics of those companies where router configuration data was discovered and analyzed.
Table 3. Overview of the companies identified from the nine easily accessed router configurations in this study2
Vertical

Reach

Employees

Revenue (US$, M)

Light manufacturing/‌supplier

Products/subassemblies integrated inlarger companies’ products

5–50

5–25

Legal

Nationwide (US) law firm

50–100

5–25

Creative

Services multiple tier one, householdbrand companies

100–500

25–100

Data center

Direct data services, as well as managed
MSP services for region

100–500

25–100MSP

Manages fintech companies

100–500

25–100Open-source software

Has over 100 million users, worldwide

100–500

500–1,000

EventsOperates trade shows and equipment
rentals

1,000–5,000

25–100Multinational technology
company

Global data company

10,000+1,000+

Telecoms

This was CPE (Customer Premises
Equipment) for a transportation company

10,000+1,000+CORPORATE SECRETS ABOUND
A range of sensitive data was found on many of the core routers we obtained for this research.
Even for those not familiar with these devices, it’s no surprise that IP lists might be found in theirconfiguration data – that’s what routers do. While our data may not be representative of theinformation inadvertently available on such devices on the secondary market – or even on routers ingeneral – it may come as a considerable surprise, and concern, what we found in our sample.
It is a treasure trove for a potential adversary – for both technical and social engineering attacks.

Customer data
In some cases, core routers point to internal and/or external information stores with specificinformation about their owners’ customers, sometimes stored on premises, which can open customers
up to potential security issues if an adversary is able to gain specific information about them. We foundsuch data for two (22%) of the networks represented in our tests.

Third-party data
As we’ve seen in real-world cyberattacks, perhaps most (in)famously in the Target incident in 2013 [8] [9],a breach of one company’s network can proliferate to their customers, partners, and other businesses
with whom they may have connections. Sensitive data allowing such third-party connections to othercompany’s networks was present for three (33%) of the configurations we recovered for these networks.

Trusted parties
Trusted parties (which could be impersonated as a secondary attack vector) would accept certificatesand cryptographic tokens found on these devices, allowing a very convincing adversary in the middle(AitM) attack with trusted credentials, capable of syphoning off corporate secrets, with victims unaware
2 Based on publicly available data, using multiple independent sources when possible.

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for long periods. Four (44%) of the networks would allow AitM attacks, were the configuration data tofall into hostile hands.

Specific applications
Complete maps of major application platforms used by specific organizations, both locally hosted andin the cloud, were scattered liberally throughout the configurations of these devices. These applications
range from corporate email to trusted client tunnels for customers, physical building security such as
specific vendors and topologies for proximity access cards and specific surveillance camera networks,
and vendors, sales and customer platforms, to mention a few. These include, in alphabetical order,
Exchange, FTP, LDAP, Lync/Skype, PeopleSoft, Salesforce, SharePoint, Spiceworks, SQL, VMWare Horizon
View, and VoIP. Three of the most popular of these applications have had, respectively, three CVEs in2022 with a maximum severity of 4.9 (Medium severity), nine CVEs assigned so far in 2023 and 18 in
2022, with a maximum severity of 8.3 (High severity); and six CVEs assigned so far in 2023 and 28 in
2022, with maximum severity of 9.0 (Critical severity).
Additionally, ESET researchers were able to determine over which ports and from which hosts those
applications communicate, which ones they trust, and which ones they don’t. Due to the granularity of
the applications and the specific versions used in some cases, known exploits could be deployed acrossthe network topology that an attacker would already have mapped. In our sample, we found application
data for eight (89%) of the networks.

Extensive core routing information
From core network routes to BGP peering, OSPF, RIP, and others, we found complete layouts ofvarious organizations’ inner workings, which would provide extensive network topology information
for subsequent exploitation, were the devices to fall into the hands of an adversary. Recovered
configurations also contained nearby and international locations of many remote offices and operators,
including their relationship to the corporate office – more data that would be highly valuable topotential adversaries. IPsec tunneling can be used to connect trusted routers to each other, which
can be a component of WAN router peering arrangements and the like. In our sample, we found IPsec
credentials for two of the nine networks (22%); for eight of the networks (89%), we found router-torouter authentication keys/hashes and the expected IP tables. We found it interesting that all networks
in our sample had at least one of these types of sensitive data present.

Trusted operators
The devices were loaded with potentially crackable or directly reusable corporate credentials – including
administrator logins, VPN details, and cryptographic keys – that would allow bad actors to seamlessly
become trusted entities and thus to gain access across the network. Here, the IPsec info we mentioned
above also applies (22%); for seven networks (78%), we found VPN credentials, and root hashes for eight(89%) of the networks.

WHAT’S THE RISK?
What could an adversary do with these types of corporate secrets? In short, plan and execute an
attack with inside information normally visible only to highly credentialed personnel. Even within an
organization, rarely do folks outside core network routing, systems, and security administration haveaccess to this level of sensitive information. Core routing is normally within the realm of network
administrators and their managers, and precious few others.

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It’s not just the network. Quite often lists of application types and network locations were available, andin some cases remote cloud applications hosted in specific remote data centers, complete with whichports or controlled access mechanisms were used to access them, and from which source networks.
Additionally, there were firewall rules used to block or allow certain access from certain networks;
often, specifics about times of day they could be accessed were available as well.
With this level of detail, impersonating network or internal hosts would be far simpler for an attacker,
especially since the devices often contain VPN credentials or other easily cracked authentication tokens.
We also knew about their administrators. Some companies used a centralized admin identity to manage
company-wide assets; others designated specific individuals by name with administrative access to thelowest levels of the device.
Moreover, we knew about each organization’s approach to security in general. By noting how detailed
or vague their security defenses were on these devices, we could make a reasonable approximation
about the security levels in the rest of their environment. The irony is that the security expertisedemonstrated in these devices’ security configurations didn’t seem to map directly to the size or
sophistication of their organization: apparent security expertise was all over the map.
We would expect to see a large, multinational organization have a very structured, standards-driven,and complete set of security initiatives reflected in their devices’ configurations, but that just wasn’t
always the case.
We also noted, significantly, that multiple devices were acquired following decommissioning frommanaged IT providers who operate networks for much larger organizations, so often the affectedorganizations would have no idea that they may now be vulnerable to attacks due to data leaks bysome third party. This seemed like a massive security attack surface that was potentially wide open toa whole host of target organizations. Two such IT companies (an MSSP in one case) managed networks
for hundreds of clients in a variety of sectors including education, finance, healthcare, manufacturing,and professional services, among others.
We sampled across multiple device manufacturers to emulate a typical environment and foundunredacted configuration data distributed fairly uniformly across device types. Some devices had better
default security settings that made some data harder to access, but all devices had settable options toguard against the proliferation of “residual data”, even if they weren’t implemented; settings that would
have been free and fairly simple to implement had the previous owners or operators3 known – or cared– to enable them.
For example, here we provide a couple of heavily redacted samples from two routers we purchased.
Figure 3 shows a variety of administrative access and methodologies along with crackable passwords.

Figure 3. Extract from a Juniper SRX series configuration

3 For brevity’s sake, we will use owner or owners from here on, but it should be read as “owner(s) or operator(s)”.

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Figure 4 shows the relationship between the previous owner’s company and many of their vendors andtechnologies, with specific IPs, to give a hacker a massive head start attacking from many potential
angles. It also outlines real names of trusted personnel on the network, and some malware they were
having problems with, so blacklisted a couple of entire IP blocks.

Figure 4. Extract from another Juniper SRX series configuration

THE HUMAN ELEMENT
Like many tales in cybersecurity, this is a story about human error and lack of resources.
It is tempting to assume that companies – especially large multinationals – have rooms full of security
analysts working on security issues, but often that is simply not the case. Most network admins arehopelessly over-subscribed and often swamped by tech support tickets. And even if a company has an IT
department, it may not have any security specialists at all [10]. (ISC)2 reported in its 2022 Cybersecurity
Workforce Study an estimated global cybersecurity workforce of 4.7 million people, but with a 3.4 million
shortfall; an estimated 410,695 of those unfilled positions were in the US alone [11]. Further, ISACA’s Stateof Cybersecurity 2022 report found that over 60% of surveyed information security professionals worked
in organizations that had either, or both, unfilled cybersecurity positions or cybersecurity teams thatwere understaffed [12] [13].
This pushes the myriad tasks of rolling out and managing best practices on security gear to the backburner. Normally the emphasis is on getting the equipment up and running – then keeping it that

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way – but hardly ever on training and continuing education to understand the latest security defenses
available. Security is often viewed as a cost that’s hard to justify. But then, so are breaches.

THIRD-PARTY TRUSTThird parties – from cloud providers to managed service providers (MSPs) to hosts of others – vie forour attention, but they also may represent vulnerable security services that are hard to understand,control, and remediate in the event of a security breach.
Speaking of trust, and its implied responsibility, who is most responsible for these corporate leaks? Thereactually is a chain of mistrust, starting with the party that originally owned these devices, and running
through the third parties they trusted to manage, secure, deploy, and maintain them. Then there’s theissue of what happens after these devices leave the premises, either expectedly or unexpectedly. Our
research points to both, and lots of shades of responsibility.
When equipment and services move outside of your perimeter, there is a fresh chain of potential
security issues, and little control determining which ones are trustworthy, and with what confidence
level. It’s also unclear if and when your primary provider swaps out their “trusted” third parties’ tech on
their integrated platforms. Some overzealous third parties tend to lead with marketing, not security, andthen try to get customers to indemnify them against exposure to security breaches.
In our research we found some large gaps in the processes, which are basically divided into a couple ofcategories: MSPs and third-party equipment disposal companies. Both are partially culpable for allowing
sensitive company information to leak, but not necessarily how you would expect.
In the current surge of corporate mergers and acquisitions, companies test a third party and then – if it’sa good fit – purchase and integrate its technology into their own, a process that rarely goes smoothly in
the initial stages.
Since the acquired third party does many things differently, there is a pruning process to make theirtechnology work with the acquirer’s stack. The acquirer, however, is then responsible for whatever techis involved in the mashup.
In one case, a reputable data center had a business arrangement (we didn’t deep dive into the detailsof what the arrangement was) where the data center asserted that a contracted third party did shoddy
work for a college, which eventually leaked outside the organization on some resold routing equipment.
Or so the data center said. There are several problems here:
1. Maybe the data center is ducking responsibility by shuffling the blame – the corporate equivalent of thecommon practice of blaming “the guy who left last month”. It’s uncanny how often the guy who just left
has been found to have done bad things. Or at least that’s a pretty convenient way of framing blame.
2. If the third party was, indeed, terrible, why was it engaged or acquired?
3. How are we to understand what other insecure or incompetent services may have been engaged by any
given tech provider?
In this case the data center actually has a good reputation, suggesting this sort of thing can happen
to reputable companies even if (which we couldn’t verify) they did their due diligence. The lesson here
might be that even if you’re doing your best work, relying on third parties to perform as expected is aprocess that is far from perfect.
Either way, this kind of thing could definitely have repercussions for the parent organization, which isprobably a good lesson to learn from someone else’s experience.

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TRUSTING E-WASTE DISPOSAL COMPANIESMany companies, instead, engage a third-party e-waste disposal service, charged with representing andverifying secure destruction and disposal of digital equipment and the data contained therein. In one of
the cases we researched, this is exactly what the original owner of a router we had purchased had done.
That clearly didn’t go as planned.
The medium sized manufacturing business that used this type of third-party disposal service wasshocked by the data we had (when we finally were able to get them on the phone). This data revealed
company specifics like where their data centers are (complete with IPs) and what kinds of processes
happened at those locations. From this information an adversary could get a critical view into
proprietary processes that could be invaluable to the company – their “secret sauce” – which could
be quite damaging. In an era where potential competitors digitally steal technical research, productdesigns, and other intellectual property to shortcut engineering R&D processes, this could have had areal financial impact.
The manufacturing company, in this case, was relieved to know that at least part of its sensitive data
was held securely by a cybersecurity company that then notified them, rather than that their data wasstill in the open marketplace. A representative of the company then had plenty to say about the thirdparty disposal company they contracted with, much of which is not suitable for print, but which strongly
suggests that this manufacturing company was not pleased with the “secure service”.

WHO IS REALLY TELLING THE TRUTH?
Of course, this could also just be a scapegoat for other mishandled internal processes at the
manufacturing company – it’s hard to know with our limited information. But it still begs the question
whether you really can trust a third-party disposal process, and if it can be verified that your data wastruly securely disposed of in the end. It may also depend on how much your data may be worth to othernefarious parties or for resale to the highest bidder.
In general, throughout this investigation, it was hard to know who was telling the truth. One of thecompanies that we identified as a previous owner of an investigated device, and that we successfully
contacted, claimed that the device was stolen and asked us to return it to them. We requested proof,
such as a copy of a police report or direct contact from the relevant law enforcement agency, eventually
returning the device anyway. We still haven’t been contacted by law enforcement, so we really cannot
confirm this claim.
It’s clear that trust could have been violated at a number of steps along the circuitous path before thedevices ended up in our research lab. What is not in question is that they arrived in our research lab
after being legally purchased. None of the original owners we managed to contact were thrilled tohear that these devices were out of their control and still contained sensitive company information.
Some were further surprised to learn that their former device was still in existence, having paid to haveit shredded. They were pretty happy that the devices had not fallen into the wrong hands, and that weengaged in a coordinated disclosure process and that we would not identify them beyond broad sector
and regional categorizations. And it wasn’t just tech companies we were talking to; the previous device
owners that we identified came from across the business landscape.

INDUSTRIES IMPACTED
Surprisingly, the issues were spread across multiple verticals, affecting everything from lightmanufacturing to financial, legal, and creative service companies; from SMBs to large multinational
technology companies. The takeaway? Basically, anyone who runs a moderately sophisticated network,

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TLP: WHITEor hires someone to assist them in operating one, could be affected. We broke down the specifics of theaffected organizations seen in our research in Table 3.
While their responses, and indeed abilities to respond, differ greatly across sectors and organizations,
we found that technology companies generally did a better job. They usually had more clearly definedprocesses for both disposing of equipment and responding to incidents (see the Notification section,
below). Other companies apparently have no prepared response other than fright, prayer, or ignoring
the messenger. None of these should be considered an acceptable security strategy.

NOTIFICATIONS
Once we identified organizations involved, we also initiated a separate process to attempt to notify theformer owners of the routers we had purchased. While some were responsive, others were incredibly
difficult – or impossible – to reach.
You might expect – as we did – that affected organizations would be anxious to hear about the issues
we had uncovered. That would be wrong. While it varied by organization, it was perplexingly difficult
to get responses from most of them. We discussed contacting the Cybersecurity and Infrastructure
Security Agency (CISA) – just so some of these organizations would respond. But that seemed likeoverkill for what should have been simple data leakage notifications.
After trying for many months, we still have been unable to get a response from three organizations.
One is a creative/PR agency handling major accounts for large healthcare vendors, and whose networks
contain those clients’ information. You might imagine PR agencies would be easy to get ahold of, given
their field and their understanding of potential brand damage, but it was simply not the case here.
On the other hand, they perhaps best understand the reputational damage they might suffer should
information about such a leak become public. After two months of trying to contact them, we were left
with radio silence.
We had another idea of contacting companies through LinkedIn. One fintech executive we tapped
told us that such an approach might be more effective, raising our alert above the noise threshold.
Using LinkedIn worked in a couple of cases, but was still ineffective with the creative agency, evenafter contacting two senior VP staff there. The same with the nationwide law firm, famous for its
high-volume television commercials. We got the distinct impression that neither really wanted tohear from us. Here are some potential reasons why:
1. Notification fatigue – Staging and deploying a network security suite is an exercise in tuning. If you set
the gear to default and just turn it on, you may get 30,000 notifications a week. Some operators create
an email rule that pours this torrent into a folder, which they can then ignore until they can tune thesystem. All too often, though, this flood of security notifications causes the security team to get sloppy
and ignore important ones. This is a common reason why we see teams deploy the latest technology andstill have security issues.
2. They don’t want to hear it – IT staff is famously overtaxed by support requests during normal workflows,leaving precious few cycles to track down potentially difficult problems that take many cycles to triage,and may come from a multiplicity of potentially noisy sources.
3. They don’t have a point person – At many organizations there’s not a well-defined single point of contact
for reporting security issues, so it becomes a “best effort” to determine who should be responsible, which
can lead ultimately to little or no response.
4. They don’t have a plan – It’s hard to tell, from an outsider’s perspective wanting to notify an organization,
what plan they would be expected to follow to report. We got the distinct impression from multiple
organizations that this was because they didn’t have a plan, or only a very loosely defined one. There were
exceptions: for example, the Silicon Valley-based software developer had multiple security and system

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admin staff in a virtual “war room”, analyzing our initial, low-fidelity report within a couple of hours ofreceiving it (and it was late Friday afternoon on the US West Coast).
5. They thought we were selling something – Fear can be a sales tactic, and nothing strikes fear like a
notification of a potential breach, or security issue. Unscrupulous sales teams use similar tactics often, so
thresholds for ignoring such contacts are artificially inflated just due to the noisiness of it all.
6. They thought we were scammers – Claiming something bad has happened is often the first step in a con,so it’s likely easy to dismiss.
In the end, it’s unclear why many organizations responded so poorly, if at all. While we focus on security
as practitioners – WeLiveSecurity after all – it’s pretty clear this isn’t top of mind for many organizations
who simply want to use technology, but not necessarily focus on security. Some organizations engage
managed service providers (MSPs) and hope for the best. That’s a reasonable thing to do, but it requiresa level of trust that your MSP is doing the right thing as well. We found that wasn’t necessarily the case.
If anything, this whole process highlights the issues with third-party trust from a whole bevy of parties
ranging from MSPs to “secure equipment disposal” companies, and others.

WHAT OTHER DEVICES MIGHT HAVE SECRETS?
It’s not just routers: as mentioned earlier, all kinds of hard drives and removable media in the secondary
market have already been investigated and found to be positively oozing the previous owners’ mostsensitive data, and there promises to be a proliferation of stored data on IoT devices throughout thecorporate environment. If miscreants manage to exploit one of a family of IoT devices, it seems likelythat they would be able to gather corporate secrets on the secondary market for a whole class ofdevices, and then sell that data to the highest bidder or do the exploiting themselves.
With less of a set perimeter these days, the network is more like a data swarm all around the corporate
environment, so data will be widely available wherever an individual happens to be at the moment.
Protecting what remains of that perimeter is difficult, but policing potential IoT breaches that allow
corporate security failures will be exponentially more difficult in practice.
Whether it would have been more secure to keep data within your corporate walls in this case isunclear, but cloud providers are notoriously opaque related to security issues, except to possibly say“we’re being very secure”, which is not an answer at all. In the end, you should expect that cloudproviders care far less about your data than you do ... and will try far less hard to get it back should
the inevitable happen.

BEST PRACTICES AND GUIDANCE
Everyone has a router, sometimes in production long after security updates are no longer available. But
one day its time will come. When it does, what should you do to protect yourself while disposing of it
and upgrading? Sometimes the original network administrator that set the unit up isn’t even aroundanymore to assist. Hopefully the following observations and recommendations are helpful.

How should you dispose of your routers?
Each manufacturer has specific guidelines they suggest for restoring the devices to factory default. We
researched three of the big vendors in the space; there are many others, each with their own processes
for securely wiping configuration data, so consult the manufacturer’s website for specific information
on your router. For example, instructions to reset a Cisco ASA 5500 series device to its factory default
configuration are available in [14], a Fortinet FortiGate series device in [15], and a Juniper SRX550 Services
Gateway in [16].

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The irony is that these devices are typically fairly simple to wipe, often with just a command or two.
Some units, however, store historic configurations that may still be accessible, so you should carefully
verify that there really is none of your information left on any of these devices.
Many of the devices we obtained for this research were still supported by the manufacturer, despite
not being bleeding edge or current models. In some instances, it was challenging to obtain end-of-life
information about the no longer supported devices. This was partially due to equipment manufacturers
removing information about discontinued or end-of-life devices from the public internet, and wherethat was not the case putting device information behind subscription paywalls. And, even when
information was readily available, the lack of common terminology and phrasing among the different
equipment manufacturers made these instructions more difficult to follow.
For end users who are operating core networking gear (routers and switches), and other devices whose
configuration may expose sensitive company information, we recommend doing the following:
1. Because the information for your device can go away at any time, we recommend that you save copies of
all relevant information, such as manuals and knowledge base articles, while the device is still covered byits maintenance contract. Do this regardless of whether that information is available in a public forum or
behind a subscription paywall. This includes:• copies of device firmware (all versions used in your organization),• copies of any software used with the device (all versions used in your organization),• any documents (bulletins, documentation, FAQs, knowledge base articles, etc.) you have previously
referred to when configuring, troubleshooting, or updating the device,• any documents explaining how to decommission and securely wipe the device, and• information from all support tickets opened on the device, including symptoms, troubleshooting,and steps to resolve.
2. This information should be stored in a secure location on the company’s network. This could be an
intranet, wiki, network share, or whatever method works best for organizing the information.
3. For devices with support subscriptions, create 30, 60, and 90-day alerts in your calendar for when thesubscriptions expire. Activities to occur on alerts:• 90 days out: Determine whether support subscription is to be renewed and begin the purchaseprocess for it.
• 60 days out: Begin collecting and organizing information mentioned in steps 1 and 2, above.
• 30 days out: Begin testing procedures for securely wiping a device, verifying that company sensitive
information is no longer present, and re-provisioning/staging it for use. In the event of any issues
arising with any of these procedures, resolve them by opening a ticket with the manufacturer while
the device is still under support contract.
For device manufacturers, we recommend the following:
1. Provide to the public, at no charge, full and complete instructions for securely wiping devices, even fordevices that are no longer sold or supported, and even if the information was previously behind a paywall.
2. For secure-wipe instructions, use similar language and terms not just across product lines and models,
but also across the industry so that the instructions are clear and unambiguous: remember that theperson performing the wipe may not be as familiar with your vendor-specific terminology or equipment,
and may make assumptions about how to securely wipe a device based on familiarity with a different
vendor’s tools and commands. Ensuring that your instructions are as similar and consistent as possible
with those of other manufacturers will reduce the risk of sensitive data exposure due to wiping processes
being applied incorrectly or incompletely.
3. In future designs, consider only using easily removable media to store configuration information.
Depending upon the type and complexity of a device’s configuration, this could be a CompactFlash17

How I (could’ve) stolen your corporate secrets for $100

TLP: WHITE(CF) card, SDXC card, USB flash drive, SATA DOM, or even a 2.5" or M.2 SSD. The use of proprietary form
factors is not recommended, as they decrease a legitimate operator’s ability to confirm that the storage
has been successfully wiped by removing it from the device and connecting it to a computer for externalverification and remediation, if required.
Note that some Cisco devices have such an option, using a CF card, already; see the two lower devices
in Figure 5. In the same image, the (upper) FortiGate unit has a Fortinet Storage Module option. Other
manufacturers have multiple options for device and configuration storage.

Figure 5. CompactFlash card storage slot on two Cisco devices (lower)
and the Fortinet Storage Module (FSM) slot on a FortiGate (upper)

Should you engage a data disposal or e-waste service?
Some of the original owners of the devices in our research had trusted third-party data disposal
companies to securely wipe their devices. All we can say is that these devices still made it into our
research white paper. Of course, for the minority of devices we purchased that had been wiped, wecannot tell if any of them had been handled by such third-party services or by their previous owners.
If you decide to use a third party, make sure you get some kind of certification that the work has been
completed, with an option to audit their process on request. It’s also good to know how they plan todispose of your devices once wiped. Regardless, it’s pretty straightforward to do a factory reset yourself.

What if the device is “dead”?
Recall that one of the 18 routers we initially purchased would not boot? It seems quite likely that was
the reason it was disposed of and ended up in the secondary market.
However, were any steps taken to clean this device of its configuration data? Our results suggest that56.25% of the time, the answer would be “no effective steps were taken”; we also took no further steps
to check that specific device. If you have such a “dead but configured” device, how do you wipe yourconfiguration data from a router that has no functioning console access?
One answer is to ensure that the whole device goes into the e-waste stream as an item that must be
physically shredded. Other more complicated options depend on the device, but if you are sure thatthe only place that sensitive data is recorded is some form of removable storage medium – an internal
hard drive, or internal or external removable storage media such as a CompactFlash card or similar –then physically separating the storage media from the router, and taking appropriate data wiping anddisposal steps for that media should be sufficient.

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What if you already have unsecured routers somewhere “out there”?
That’s a hard one since a targeted attack won’t be very noisy. If an attack methodology has highly
specific information about your network, it would often suggest an insider threat, but this may be
another attack vector to consider in your red/blue team exercises.
If you have a policy to rotate your cryptographic keys periodically, that can also help, but we didn’t
assess whether this was happening frequently on devices we tested. In something like Active Directory
there are ways to enforce password policy, but we didn’t see any examples of centrally managed keys.
Many of the keys were used by things like IPsec for peering with other data centers or locations, which
probably rarely – if ever – change. This means if someone has the configuration for a disposed router,they may be able to gain trusted access to other devices on your network with key reuse.
If you’ve already implemented Zero Trust in your organization, you’ll do better than other organizations.
There are two organizations we researched on these devices that actually had reasonable controls
in place and highly segmented networks, which is very good. Although the devices, complete withinformation, still left their organization, so it would still classify as a failure.

What if the previous owner’s information is on a secondhand device?
Should your organization purchase a pre-owned device and you discover the previous owner’s
information is still on it:
1. Start taking notes. These could be paper, electronic, or both. Note the time and date the device waspurchased, from whom and the order number, when it arrived, when you first accessed it, and what you
discovered. These do not have to be down to the second, but with as many of the details as you can recall.
This will be helpful if an investigation needs to be performed for insurance or legal reasons.
2. Disconnect the device from any network(s) it is attached to, even if they are only internal networks withno outside connection to the internet.
3. If the device is in a “public” area within your facilities, move it to a more secure area. This could be a locked
office or a file cabinet.
4. Contact a CISA regional office if you are in the United States, or a similar agency for your country.

POTENTIAL FURTHER RESEARCHAs already described, we did not employ any procedures or tools of a primarily forensic or data recovery
nature, nor did we open the cases of the devices purchased for this research. However, many of thesedevices contain internal hard drives, CompactFlash, or other common removable media devices, ininternal slots. Simply opening the cases of apparently wiped devices, removing such storage media,
and analyzing the devices with suitable forensic or data recovery tools might reveal how well – or how
poorly – the standard wiping procedures are implemented. Devices from all three brands involved in
the current research are based on common Unix-like OSes (Linux: Cisco IOS XE and FortiOS; Linux plus
FreeBSD: JunOS; and QNX: Cisco IOS XR), so are likely to feature well-known file systems.

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TLP: WHITECONCLUSION
Our research clearly shows there are gaping security holes in modern IT environments that can produce
data leaks that have the capability of allowing more serious data breaches, corporate theft, and othersecurity risks with significant potential impacts to the organization, its customers, and the industry.
Perhaps more concerning still is that these leaks in the corporate sector apparently are occurring at close
to the rate of analogous leaks in the secondary consumer market for hard drives and other storage
media. And that is despite the research documenting the latter failure to properly wipe such storage
devices being covered repeatedly in the popular media.
Companies should take a prominent and direct role in protecting their data and devices within their
responsibility, both when on premises, and when obsolescence or other imperatives dictate theirdisposal and movement outside the organization’s boundaries.
Further, it is not enough to assume proper disposal by third parties; this must be verified to determine
no future impact to the organization, and third-party equipment disposal companies need to up theirgame. Clearly, there is room for ongoing research in this space to determine whether such reforms
actually happen, and whether more network configuration data might be being leaked if forensic tools
are applied to the storage media of apparently wiped network devices.

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S. L. Garfinkel and A. Shelat, “Remembrance of data passed: A study of disk sanitization practices,”
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[2]

A. Jones, C. Valli, I. Sutherland and P. Thomas, “The 2006 Analysis of Information Remaining on Disks
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A. Jones, O. Angelopoulou and L. Noriega, “Survey of Data Remaining on Second Hand Memory Cards
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L. Myers, “Target targeted: Five years on from a breach that shook the cybersecurity industry,” 18 12
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[Online]. Available: https://www.welivesecurity.com/2021/04/07/supply-chain-attacks-when-trust-goeswrong-try-hope/. [Accessed 26 03 2023].

[10]

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[11](ISC)², “(ISC)² 2022 Cybersecurity Workforce Study,” 18 10 2022. [Online]. Available: https://www.isc2.org/-/
media/ISC2/Research/2022-WorkForce-Study/ISC2-Cybersecurity-Workforce-Study.ashx. [Accessed 26 03
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[12]ISACA, “State of Cybersecurity 2022 Part 1 Infographic,” 16 03 2022. [Online]. Available: https://www.
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[14]

Cisco Systems, Inc., “Cisco Security Appliance Command Line Configuration Guide, Version 7.2,” Cisco
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[15]

Fortinet, Inc., “Technical Tip: How to reset a FortiGate with the default factory settings/without losing
management access,” Fortinet, Inc., 07 09 2015. [Online]. Available: https://community.fortinet.com/t5/
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Juniper Networks, Inc., “Resetting the SRX550 Services Gateway,” Juniper Networks, Inc., 13 09 2017.
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ABOUT ESETFor more than 30 years, ESET has been developing industry-leading IT security software and services
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and consumers worldwide. ESET has long pioneered machine learning and cloud technologies thatprevent, detect and respond to malware. ESET is a privately owned company that promotes scientificresearch and development worldwide.