From: Secunia Security Advisories (sec-advsecunia.com)
Date: Mon Feb 23 2009 - 17:20:05 CST

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TITLE:
Ziproxy HTTP "Host:" Header Security Bypass

SECUNIA ADVISORY ID:
SA34018

VERIFY ADVISORY:
http://secunia.com/advisories/34018/

DESCRIPTION:
A security issue has been reported in Ziproxy, 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).

The security issue is reported in version 2.6.0. Other versions may
also be affected.

SOLUTION:
The vendor recommends to use a proxy server with better security
capabilities between clients and Ziproxy. 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

http://www.kb.cert.org/vuls/id/MAPG-7N9GN8

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