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Squid: Denial of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200703-27 / squid
Release Date March 31, 2007
Latest Revision March 31, 2007: 01
Impact low
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-proxy/squid < 2.6.12 >= 2.6.12 All supported architectures

Related bugreports: #171681


Squid is affected by a Denial of Service vulnerability.

2.  Impact Information


Squid is a multi-protocol proxy server.


Squid incorrectly handles TRACE requests that contain a "Max-Forwards" header field with value "0" in the clientProcessRequest() function.


A remote attacker can send specially crafted TRACE HTTP requests that will terminate the child process. A quickly repeated attack will lead to a Denial of Service.

3.  Resolution Information


There is no known workaround at this time.


All Squid users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-proxy/squid-2.6.12"

4.  References


Page updated March 31, 2007

Summary: This is a Gentoo Linux Security Advisory

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