Cisco Security Advisory
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AV:N/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C
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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 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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Vulnerable Products
Cisco Secure ACS for Windows versions 4.0 through 4.2.1.15 are affected by this vulnerability when configured as a RADIUS server with EAP-FAST authentication.
Cisco Secure ACS, when configured as TACACS+ server only, does not support the EAP-FAST authentication method, and is not vulnerable.
Products Confirmed Not Vulnerable
Cisco Secure Access Control Server Express, Cisco Secure Access Control Server View, and Cisco Secure Access Control System are not affected by this vulnerability.
No other Cisco products are currently known to be affected by this vulnerability.
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Cisco Secure ACS operates as a centralized RADIUS and TACACS+ server, combining user authentication, user and administrator device access control, and policy control into a centralized identity networking solution.
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.
Commands are executed in the context of the System user for Cisco Secure ACS authentication service running on Microsoft Windows.
Cisco Secure ACS uses the standard RADIUS UDP port 1812 or 1645 for EAP-FAST authentication.
This vulnerability has been documented in Cisco bug ID CSCui57636 (registered customers only) for the Cisco Secure ACS and has been assigned the Common Vulnerabilities and Exposures (CVE) ID CVE-2013-3466.
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There are no workarounds for this vulnerability.
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When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
This vulnerability is first fixed in Cisco Secure ACS for Windows release 4.2.1.15.11.
Cisco Secure ACS for Windows can be downloaded from the Software Center on Cisco.com by visiting http://www.cisco.com/cisco/software/navigator.html and navigating to Products > Security > Access Control and Policy > Policy and Access Management > Cisco Secure Access Control Server for Windows
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
This vulnerability was reported to Cisco by Brad Antoniewicz from McAfee and Foundstone Professional Services. Cisco would like to thank Mr. Antoniewicz for reporting this vulnerability to us and for working with us towards coordinated disclosure of the vulnerability.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessRevision 1.0 2013-August-28 Initial public release
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