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Category:   Application (Security)  >   Cisco Secure Access Control Server Vendors:   Cisco
Cisco Secure Access Control Server EAP-FAST Authentication Flaw Lets Remote Users Execute Arbitrary Commands
SecurityTracker Alert ID:  1028958
SecurityTracker URL:  http://securitytracker.com/id/1028958
CVE Reference:   CVE-2013-3466   (Links to External Site)
Date:  Aug 28 2013
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0 through 4.2.1.15
Description:   A vulnerability was reported in Cisco Secure Access Control Server. A remote user can execute arbitrary code on the target system.

A remote user can exploit a flaw in the in parsing of user identities in the EAP-FAST authentication module to execute arbitrary commands on the target Cisco Secure ACS server.

Systems configured as a RADIUS server are affected.

The vendor has assigned bug ID CSCui57636 to this vulnerability.

Brad Antoniewicz from McAfee and Foundstone Professional Services reported this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130828-acs

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130828-acs (Links to External Site)
Cause:   Input validation error
Underlying OS:   Windows (Any)

Message History:   None.


 Source Message Contents

Date:  Wed, 28 Aug 2013 12:00:26 -0400
Subject:  Cisco Security Advisory: Cisco Secure Access Control Server Remote Command Execution Vulnerability

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Cisco Security Advisory: Cisco Secure Access Control Server Remote Command Execution Vulnerability

Advisory ID: cisco-sa-20130828-acs

Revision 1.0

For Public Release 2013 August 28 16:00  UTC (GMT)

+----------------------------------------------------------------------

Summary
=======

A vulnerability in the EAP-FAST authentication module of Cisco Secure Access Control Server (ACS) versions 4.0 through 4.2.1.15 could allow an unauthenticated, remote attacker to execute arbitrary commands on the Cisco Secure ACS server. This vulnerability is only present when Cisco Secure ACS is configured as a RADIUS server.

The vulnerability is due to improper parsing of user identities used for EAP-FAST authentication. An attacker could exploit this vulnerability by sending crafted EAP-FAST packets to an affected device. An exploit could allow the attacker to execute arbitrary commands on the Cisco Secure ACS server and take full control of the affected server.

There are no workarounds for this vulnerability.

Cisco has released free software updates that address this vulnerability. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130828-acs
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