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TITLE:
Blue Coat ProxySG HTTP "Host:" Header Security Bypass

SECUNIA ADVISORY ID:
SA34064

VERIFY ADVISORY:
http://secunia.com/advisories/34064/

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

The security issue is caused due to ProxySG 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:
The vendor has published workarounds. See the vendor's advisory for
additional information.

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

ORIGINAL ADVISORY:
https://hypersonic.bluecoat.com/support/securityadvisories/ProxySG_in_transparent_deployments

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

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