Full Disclosure: Tortoise SVN DLL Hijacking Vulnerability

[Nikhil Mittal <nikhil_uitrgpv () yahoo co in>]

1. Overview
Tortoise SVN is vulnerable to Windows DLL Hijacking Vulnerability. Version 1.6.10, Build 19898 (latest available on 
30th August 2010 was tested) is vulnerable.

2. Vulnerability Description
Tortoise SVN passes insufficiently qualified path for the dll "dwmapi.dll" while opening a file using TortoiseProc

Timeline
30-08-2010 - Discovered Vulnerability
30-08-2010 - Informed the developers
30-08-2010 - Response from developers (in 25  minutes)
31-08-2010 - Disclosure


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-3199 to this issue. This is a 
candidate for  inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems.


3. Exploitability
A file extension needs to be registered with TortoiseProc to exploit the vulnerability and a crafted file needs to be 
opened from a network share.

4. Versions Affected
TortoiseSVN 1.6.10, Build 19898 and lower.

5. POC/Exploit
Done with Webdav hijack module of Metasploit

6. Impact
Remote Code Execution in context of TortoiseProc

7. References
http://tortoisesvn.tigris.org/ds/viewMessage.do?dsForumId=4061&dsMessageId=2653163

8. Solution
Fix awaited from Microsoft. Meanwhile workarounds can be found here 
http://www.microsoft.com/technet/security/advisory/2269637.mspx

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Nikhil Mittal





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