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Date: Mon, 8 Jan 2007 20:29:23 +0100
From: thorben schroeder <>
Subject: cisco nac bypass vulnerability - cisco trust agent

hello list,
the  cisco  network  admission control system gives an adminitrator the
chance  to  check  the  clients,  whether  they have installed certain
patches / hotfixes. this check is not reliable.

programm version: cisco trust agent (probably all versions)
os: windows xp sp2
vendor informed: yes (got only automated feedback mail)
severity: low - med

vulnerability:  the cta checks the patch level only with some registry
queries which can be manipulated

- "Cisco:Host:Hotfix contains KB919007" as posture validation
- the KB919007 hotfix is not installed!
- copy the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows
XP\SP3\KB873339 key and change it into a KB919007 key
- result: client is healty


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