Cisco PIX/ASA/FWSM WebSense URL Filtering Bypass - Secunia Advisories - Vulnerability Intelligence

Cisco PIX/ASA/FWSM WebSense URL Filtering Bypass
Secunia Advisory:	SA20044	Advisory Toolbox: Issue ticket Save in to-do list Mark as handled Exploit information Download as PDF Review actions Add comment
Release Date:	2006-05-09
Popularity:	24,093 views

Critical:	Less critical
Impact:	Security Bypass
Where:	From local network
Solution Status:	Vendor Patch

OS:	Cisco Adaptive Security Appliance (ASA) 7.x Cisco PIX 6.x Cisco PIX 7.x

Software:	Cisco Firewall Services Module (FWSM) 2.x Cisco Firewall Services Module (FWSM) 3.x

Subscribe:	Instant alerts on relevant vulnerabilities

CVE reference:	CVE-2006-0515

Description: George D. Gal has reported a vulnerability in Cisco PIX/ASA/FWSM, which can be exploited by malicious people to bypass certain security restrictions. The vulnerability is caused due to an error within the handling of fragmented HTTP requests. This can be exploited to bypass Websense URL filtering and gain access to restricted websites via HTTP GET requests that are fragmented into multiple packets. Successful exploitation requires that PIX, ASA, or FWSM are configured to use Websense/N2H2 for content filtering. The vulnerability has been reported in the following products: * Cisco PIX software version 6.3.x and older. * Cisco PIX/ASA software version 7.x. * Cisco FWSM software version 2.3 and 3.1. Solution: Update to the fixed versions. FWSM version 2.3: Update to version 2.3(4). http://www.cisco.com/pcgi-bin/tablebuild.pl/cat6000-fwsm?psrtdcat20e2 FWSM version 3.1: Update to version 3.1(1.7). Contact Cisco TAC or Cisco support partner for the updates. PIX version 6.3.x: Update to version 6.3.5(112). Contact Cisco TAC or Cisco support partner for the updates. PIX/ASA version 7.x: Update to version 7.0(5) or 7.1(2). http://www.cisco.com/pcgi-bin/tablebuild.pl/pix?psrtdcat20e2 http://www.cisco.com/pcgi-bin/tablebuild.pl/asa?psrtdcat20e2 Provided and/or discovered by: George D. Gal Original Advisory: Cisco: http://www.cisco.com/warp/public/707/cisco-sr-20060508-pix.shtml Virtual Security Research, LLC: http://www.vsecurity.com/bulletins/advisories/2006/cisco-websense-bypass.txt

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