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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
Squid Host Header Processing Lets Remote Users Bypass Security and Poison the Proxy Cache
SecurityTracker Alert ID:  1035768
SecurityTracker URL:  http://securitytracker.com/id/1035768
CVE Reference:   CVE-2016-4553   (Links to External Site)
Date:  May 6 2016
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.2.0.11 - 3.5.17, 4.x - 4.0.9
Description:   A vulnerability was reported in Squid. A remote user can poison the proxy cache.

A remote user can submit a specially crafted Host header value to bypass security policy and poison the proxy cache and any downstream caches.

Jianjun Chen from Tsinghua University reported this vulnerability.

Impact:   A remote user may be able to poison the proxy cache and downstream caches with arbitrary content.
Solution:   The vendor has issued a fix (3.5.18, 4.0.10).

The vendor's advisory is available at:

http://www.squid-cache.org/Advisories/SQUID-2016_7.txt

Vendor URL:  www.squid-cache.org/Advisories/SQUID-2016_7.txt (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 31 2016 (Red Hat Issues Fix) Squid Host Header Processing Lets Remote Users Bypass Security and Poison the Proxy Cache
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Jun 9 2016 (Ubuntu Issues Fix) Squid Host Header Processing Lets Remote Users Bypass Security and Poison the Proxy Cache
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, 15.10, and 16.04 LTS.



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