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Category:   Application (Web Server/CGI)  >   Squid Vendors:   Squid-cache.org
Squid Lets Remote Users Bypass Same-Origin Restrictions on the Target System
SecurityTracker Alert ID:  1035769
SecurityTracker URL:  http://securitytracker.com/id/1035769
CVE Reference:   CVE-2016-4554   (Links to External Site)
Date:  May 6 2016
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.x - 3.5.17
Description:   A vulnerability was reported in Squid. A remote user can bypass same origin restrictions on the target system.

A remote user can supply a specially crafted header value to bypass same-origin restrictions on the Host header and poison the proxy cache.

Jianjun Chen from Tsinghua University reported this vulnerability.

Impact:   A remote user can bypass same origin restrictions and poison the proxy cache on the target system.
Solution:   The vendor has issued a fix (3.5.18).

The vendor's advisory is available at:

http://www.squid-cache.org/Advisories/SQUID-2016_8.txt

Vendor URL:  www.squid-cache.org/Advisories/SQUID-2016_8.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 Lets Remote Users Bypass Same-Origin Restrictions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
May 31 2016 (Red Hat Issues Fix) Squid Lets Remote Users Bypass Same-Origin Restrictions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Jun 9 2016 (Ubuntu Issues Fix) Squid Lets Remote Users Bypass Same-Origin Restrictions on the Target System
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, 15.10, and 16.04 LTS.



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