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Squid: Multiple Denial of Service vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200701-22 / squid
Release Date January 25, 2007
Latest Revision January 25, 2007: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-proxy/squid < 2.6.7 >= 2.6.7 All supported architectures

Related bugreports: #162364


Two vulnerabilities have been found in Squid which make it susceptible to Denial of Service attacks.

2.  Impact Information


Squid is a multi-protocol proxy server.


Squid fails to correctly handle ftp:// URI's. There is also an error in the external_acl queue which can cause an infinite looping condition.


An attacker could attempt to retrieve a specially crafted URI via a Squid server causing the service to crash. If an attacker could generate a sufficiently high load on the Squid services, they could cause a Denial of Service by forcing Squid into an infinite loop.

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-2.6.7"

4.  References


Page updated January 25, 2007

Summary: This is a Gentoo Linux Security Advisory

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