----------------------------------------------------------------------

Did you know? Our assessment and impact rating along with detailed
information such as exploit code availability, or if an updated patch
is released by the vendor, is not part of this mailing-list?
        
Click here to learn more about our commercial solutions:
http://secunia.com/advisories/business_solutions/
        
Click here to trial our solutions:
http://secunia.com/advisories/try_vi/

----------------------------------------------------------------------

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

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------