TITLE:
Cisco Secure Access Control Server Downloadable IP Access Control
List Vulnerability

SECUNIA ADVISORY ID:
SA18141

VERIFY ADVISORY:
http://secunia.com/advisories/18141/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From local network

OPERATING SYSTEM:
Cisco PIX 6.x
http://secunia.com/product/56/
Cisco PIX 7.x
http://secunia.com/product/6102/
Cisco VPN 3000 Concentrator
http://secunia.com/product/90/
Cisco VPN 3002 Hardware Client 3.x
http://secunia.com/product/3382/

SOFTWARE:
Cisco Firewall Services Module (FWSM) 1.x
http://secunia.com/product/2273/
Cisco Firewall Services Module (FWSM) 2.x
http://secunia.com/product/5088/
Cisco Secure ACS 3.x
http://secunia.com/product/679/

DESCRIPTION:
ovt has reported a vulnerability in Cisco Secure ACS (Access Control
Server), which potentially can be exploited by malicious people to
bypass certain security restrictions.

The vulnerability is caused due to a design error in the Downloadable
IP ACL (Access Control List) feature. This can be exploited by
malicious people who knows the name of a Downloadable IP ACL
configured on the ACS server to authenticate to the RAS/NAS (Remote
Access Server/Network Access Server) by using the name of that ACL as
their user name.

Successful exploitation requires that the attacker knows the name of
the Downloadable IP ACL e.g. by sniffing network traffic between the
RAS/NAS and the ACS server.

SOLUTION:
The vulnerability has been fixed in the following versions.
* Cisco Secure ACS Version 4.0.1
* PIX version 6.3(5)
* PIX/ASA 7.0(2)
* Cisco IOS Software Version 12.3(8)T4
* VPN 3000 versions 4.0.5.B and 4.1.5.B

Cisco FWSM:
Refer to vendor's original advisory for workaround instructions.

PROVIDED AND/OR DISCOVERED BY:
ovt

ORIGINAL ADVISORY:
Cisco:
http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_field_notice09186a00805bf1c4.shtml

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