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Squid: Denial of Service through DNS responses


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200502-25 / Squid
Release Date February 18, 2005
Latest Revision February 18, 2005: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-proxy/squid < 2.5.8 >= 2.5.8 All supported architectures

Related bugreports: #81997


Squid contains a bug in the handling of certain DNS responses resulting in a Denial of Service.

2.  Impact Information


Squid is a full-featured Web proxy cache designed to run on Unix-like systems. It supports proxying and caching of HTTP, FTP, and other protocols, as well as SSL support, cache hierarchies, transparent caching, access control lists and many other features.


Handling of certain DNS responses trigger assertion failures.


By returning a specially crafted DNS response an attacker could cause Squid to crash by triggering an assertion failure.

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-2.5.8"

4.  References


Page updated February 18, 2005

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