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 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 --------------------------------------- Nikhil Mittal