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Category:   Device (Firewall)  >   Cisco ASA Vendors:   Cisco
Cisco ASA Input Validation Flaw in Clientless SSL VPN Feature Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1022122
SecurityTracker URL:  http://securitytracker.com/id/1022122
CVE Reference:   CVE-2009-1220   (Links to External Site)
Updated:  May 5 2009
Original Entry Date:  Apr 24 2009
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 8.0.4(28) and prior versions
Description:   A vulnerability was reported in Cisco ASA. A remote user can conduct cross-site scripting attacks.

The clientless SSL VPN 'index.html' page does not properly filter HTML code from user-supplied input in the HTTP Host header before displaying the input. A remote user can create a specially crafted HTTP POST request that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the Cisco ASA SSL VPN page and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

The vendor was notified on February 15, 2008.

Cisco has assigned Cisco bug ID CSCsy82093 to this vulnerability.

BugsNotHugs reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the Cisco ASA VPN site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   No solution was available at the time of this entry.

The vendor plans to include a fix in versions 8.0.3.31, 8.1.2.22, and 8.2.0.

The vendor's advisory is available at:

http://tools.cisco.com/security/center/viewAlert.x?alertId=17950

Vendor URL:  www.cisco.com/ (Links to External Site)
Cause:   Input validation error

Message History:   None.


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