full-disclosure - [FD] F5 Unauthenticated rsync access to Remote Root Code Execution

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Message-ID: <9700D2E023CDBD459EAB0EB9732B8146095046@sa-exch02.security-assessment.local>
Date: Thu, 28 Aug 2014 22:34:48 +0000
From: Thomas Hibbert <Thomas.Hibbert@...urity-assessment.com>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: [FD] F5 Unauthenticated rsync access to Remote Root Code Execution

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                presents..

F5 Unauthenticated rsync access to Remote Root Code Execution

Affected Versions: F5 BIG-IP 11.x versions before 11.6.0, 11.5.1 HF3, 11.5.0 HF4, 
                   11.4.1 HF, 11.4.0 HF7, 11.3.0 HF9, and 11.2.1 HF11, 
                   Enterprise Manager 3.x versions before 3.1.1 HF2
PDF: http://www.security-assessment.com/files/documents/advisory/F5_Unauthenticated_rsync_access_to_Remote_Root_Code_Execution.pdf

+-------------+
| Description |
+-------------+

When configured in a high availability mode, the F5 solution suffers from an 
unauthenticated rsync access vulnerability that can be leveraged to upload a
malicious SSH key and gain remote root access to the appliance.

The BigIP platform configures an rsync daemon listening on the ConfigSync
interfaces when the system is configured in a failover mode. The rsync 
daemon as currently configured does not require any authentication and the 
"cmi" module has complete read/write access to the system. If the ConfigSync
IP addresses are accessible by a malicious third party, it is possible to
upload an authorized_keys file directly into the /var/ssh/root directory and
then open a root SSH session on the f5 device.

+--------------+
| Exploitation |
+--------------+

Detailed exploitation information is available in the PDF version of this
Advisory, available at http://www.security-assessment.com.

+----------+
| Solution |
+----------+

F5 have published a detailed advisory, including patch and mitigation 
information, at the following URL:

http://support.f5.com/kb/en-us/solutions/public/15000/200/sol15236.html

+---------------------+
| Disclosure Timeline |
+---------------------+

24-04-2014: Vendor notified at security-reporting@...com
24-04-2014: Vendor responds with intent to investigate, and opens a support
            ticket to track the issue
05-05-2014: First follow up sent
06-05-2014: Vendor responds with internal bug numbers
10-05-2014: Vendor advises code fixes are complete and offers an embargo 
            date of 29-08-2014 for advisory release
12-05-2014: Embargo date accepted
29-08-2014: Advisory released

About Security-Assessment.com
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services to clients throughout the Asia Pacific region. Our clients include
some of the largest globally recognised companies in areas such as finance,
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Security-Assessment.com is committed to security research and development,
and its team continues to identify and responsibly publish vulnerabilities
in public and private software vendor's products. Members of the 
Security-Assessment.com R&D team are globally recognised through their release
of whitepapers and presentations related to new security research.

For further information on this issue or any of our service offerings, 
contact us:

Web www.security-assessment.com
Email info@...urity-assessment.com
Phone +64 4 470 1650

Thomas Hibbert
Security Consultant
Security-Assessment.com

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