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TITLE:
Squid HTTP "Host:" Header Security Bypass

SECUNIA ADVISORY ID:
SA34019

VERIFY ADVISORY:
http://secunia.com/advisories/34019/

DESCRIPTION:
A security issue has been reported in Squid, which can be exploited
by malicious people to bypass certain security restrictions.

The security issue is caused due to the application relying on HTTP
"Host:" headers when acting as transparent proxy. This can be
exploited to e.g. access restricted websites or bypass a browser's
security context protection mechanism by sending HTTP requests with a
forged HTTP "Host:" header.

Successful exploitation requires that the attacker can forge the HTTP
"Host:" header (e.g. via active content).

SOLUTION:
Use a proxy server with better security capabilities between clients
and Squid. Use a firewall to restrict access to untrusted websites.

PROVIDED AND/OR DISCOVERED BY:
US-CERT credits Robert Auger, PayPal Information Risk Management
team.

ORIGINAL ADVISORY:
US-CERT VU#435052:
http://www.kb.cert.org/vuls/id/435052

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