[NEWS] Cross-Site Scripting in Cisco Secure ACS

From: support@securiteam.com
Date: 06/15/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sat, 15 Jun 2002 21:41:02 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  Cross-Site Scripting in Cisco Secure ACS
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SUMMARY

 <http://www.cisco.com/warp/public/cc/pd/sqsw/sq/> Cisco Secure ACS
provides authentication, authorization, and accounting (AAA-pronounced
"triple A") services to network devices that function as AAA clients, such
as a network access server, PIX Firewall, or router. A security
vulnerability in the product allows for the presence of a cross site
scripting vulnerability.

DETAILS

Vulnerable systems:
 * Cisco Secure ACS version 3.0 (Win32)

Testing Cisco Secure reveals a cross-site scripting problem in the web
server component. Specifically, the "action" argument that the setup.exe
handler uses does not appear to do proper input validation.

Proof-of-concept:
http://IP.ADD.RE.SS:dyn_port/setup.exe?action=>alert('foo+bar')</script>&page=list_users&user=P*
(URL may wrap)

Obviously one needs to already be authenticated to the ACS web server for
this to successfully be carried out.

Solution:
Follow best practices, don't make the web component of ACS server
available over the Internet.

Vendor status:
Cisco was contacted on May 21st. They have committed to fixing this in the
next release of the software, due out in "mid to late summer".

ADDITIONAL INFORMATION

The information has been provided by <mailto:dpalumbo@yahoo.com> Dave
Palumbo.

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