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[SA16530] Cisco Clean Access Host-based Check Bypass Security Issue

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Tue Aug 23 2005 - 13:23:31 CDT


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TITLE:
Cisco Clean Access Host-based Check Bypass Security Issue

SECUNIA ADVISORY ID:
SA16530

VERIFY ADVISORY:
http://secunia.com/advisories/16530/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
From local network

SOFTWARE:
Cisco Clean Access (CCA) 3.x
http://secunia.com/product/5561/

DESCRIPTION:
llhansen has reported a security issue in CCA (Cisco Clean Access),
which can be exploited by malicious people to bypass certain security
restrictions.

The security issue is caused due to the CCA Server relying on the
"User-Agent" string sent by the user's browser to determine whether
to install the CCA Agent. This can be bypassed by sending a fake
"User-Agent" string.

Successful exploitation allows a Windows system to bypass host-based
checks.

The security issue has been reported in versions 3.5.3.1 and 3.5.4.

SOLUTION:
See the vendor's advisory for recommended solutions.

PROVIDED AND/OR DISCOVERED BY:
llhansen

ORIGINAL ADVISORY:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sn-20050822-cca.shtml

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