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TITLE:
Websense "Via" Header Filtering Bypass Security Issue

SECUNIA ADVISORY ID:
SA39931

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/39931/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=39931

RELEASE DATE:
2010-06-05

DISCUSS ADVISORY:
http://secunia.com/advisories/39931/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/39931/

ONLY AVAILABLE IN CUSTOMER AREA:
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https://ca.secunia.com/?page=viewadvisory&vuln_id=39931

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
mrhinkydink has reported a security issue in Websense, which can be
exploited by malicious people to bypass certain security
restrictions.

The security issue is caused due to the Websense ISAPI Filter plug-in
improperly filtering HTTP requests. This can be exploited to bypass
URL filtering rules and access restricted websites without monitoring
by including an HTTP "Via" header in outgoing HTTP requests.

The security issues is reported in version 6.3.0 with Hotfix 54 or
later, configured with Microsoft ISA Server 2004 or 2006 or with
Microsoft Forefront TMG 2010.

SOLUTION:
Disable the "IgnoreForwardedRequest" configuration option. Please see
the vendor's advisory for additional information.

PROVIDED AND/OR DISCOVERED BY:
mrhinkydink

ORIGINAL ADVISORY:
Websense:
http://kb.websense.com/display/4/kb/article.aspx?aid=5117&n=1&docid=1557093

mrhinkydink:
http://mrhinkydink.blogspot.com/2010/05/websense-633-via-bypass.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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