Squid: Denial of Service through DNS responses

1. Gentoo Linux Security Advisory

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

Synopsis

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

2. Impact Information

Background

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.

Description

Handling of certain DNS responses trigger assertion failures.

Impact

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

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

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

CAN-2005-0446

Updated February 18, 2005

Summary: This is a Gentoo Linux Security Advisory

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