# JASBUG

JASBUG is a security bug disclosed in February 2015 and affecting core components of the Microsoft Windows Operating System. The vulnerability dated back to 2000 and affected all supported editions of Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, Windows Server 2012, Windows RT, Windows 8.1, Windows Server 2012 R2, and Windows RT 8.1.
The vulnerability allows hackers to remotely take control of Windows devices that connect to an Active Directory domain.
JASBUG is registered in the Common Vulnerabilities and Exposures system as CVE-2015-0008. The Industrial Control Systems Cyber Emergency Response Team, part of the Department of Homeland Security, issued ICS-ALERT-15-041-01, warning control systems owners that they should expedite applying critical JASBUG fixes.
Microsoft released two patches, MS15-011 and MS15-014, to address JASBUG on the same day the vulnerability was disclosed. These fixes took Microsoft over a year to develop and deploy due to the complexity of the JASBUG vulnerability.
At the time of disclosure, more than 300 million computers were believed to be vulnerable to the exploit.

## History

JASBUG was disclosed to the public by Microsoft as a part of "Patch Tuesday," on February 10, 2015.

### Background

The vulnerability was initially reported to Microsoft in January 2014 by Jeff Schmidt, founder of JAS Global Advisors. After Microsoft publicly announced the security vulnerability, it garnered the name JASBUG in reference to the role JAS Global Advisors played in discovering the exploit.

### Discovery

In 2014, JAS Global Advisors was working on an engagement with the Internet Corporation for Assigned Names and Numbers (ICANN), the organization governing the standards of the Internet, to research potential technical issues surrounding the rollout of new Generic Top Level Domains (gTLDs) on the Internet.
While working on the research, JAS Global Advisors, with business partner SimMachines, uncovered the vulnerability by applying "big data" analytical techniques to very large technical data sets.

## Effect

JASBUG principally affects business and government users. Home users are less likely to be affected by JASBUG because they do not use domain-configured computers.
White House cybersecurity advisor Michael Daniel spoke about the importance of addressing JASBUG in a meeting of the Information Security and Privacy Advisory Board of the National Institute for Standards and Technology, and the Office of Management and Budget and the Department of Homeland Security immediately took steps to fix the vulnerability on federal networks.
Suzanne E. Spaulding, serving as Under Secretary for the National Protection and Programs Directorate (NPPD) at the Department of Homeland Security, mentioned JASBUG in a February 2015 House of Representatives hearing that touched on the potential effect of a DHS funding hiatus.
In the aftermath of JASBUG, various government agencies have updated their technical specifications to mitigate exploit risks. For example, the United States Department of Veteran Affairs decided in May 2015 to "unapprove" the use of Windows Server 2003 based on JASBUG risks.

### Exploitation

According to Microsoft, the exploit takes advantage of how Group Policy receives and applies policy data when a domain-joined system connects to a domain controller. One likely exploitation of the flaw involves deceiving a user with a domain-configured system into a network controlled by a hacker.
Despite the potential effect, there is no indication that the JASBUG vulnerability was ever used by cyberhackers to access corporate or government computers.

### Specific systems affected

JASBUG affects Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, Windows 8.1, Windows Server 2012, Windows Server 2012 R2, Windows RT, and Windows RT 8.1. Windows Server 2003 is also affected, but there will not be a JASBUG patch this platform, as Microsoft has indicated that it is not feasible to build a fix for this version. JASBUG also affects Windows XP and Windows 2000, but no patch will be made available for these operating systems as they are no longer supported by Microsoft.

## Bugfix and deployment

Unlike other high-profile vulnerabilities like Heartbleed, Shellshock, Gotofail and POODLE, JASBUG was a design problem, not an implementation problem, making this type of vulnerability unusual and much more difficult to fix. The fix required Microsoft to re-engineer core components of the operating system and to add several new features, including additional hardening of Group Policy, the feature that organizations use to centrally manage Windows systems, applications, and user settings in Active Directory environments.
Microsoft was not able to fix the JASBUG flaw on Windows Server 2003 systems, noting that "The architecture to properly support the fix provided in the update does not exist on Windows Server 2003 systems, making it infeasible to build the fix for Windows Server 2003."
For unpatched and unpatchable platforms that may be vulnerable to JASBUG, security firms like Symantec recommend that organizations use intrusion prevention systems (IPS) to monitor network activity for possible malicious JASBUG traffic.