Squid: Multiple Denial of Service vulnerabilities

Security Team Contact Address

Updated March 24, 2009

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200903-38 / Squid
Release Date	March 24, 2009
Latest Revision	March 24, 2009: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-proxy/squid	< 2.7.6	>= 2.7.6	All supported architectures

Related bugreports: #216319, #257585

Synopsis

Multiple vulnerabilities have been found in Squid which allow for remote Denial of Service attacks.

2. Impact Information

Background

Squid is a full-featured web proxy cache.

Description

The arrayShrink function in lib/Array.c can cause an array to shrink to 0 entries, which triggers an assert error. NOTE: this issue is due to an incorrect fix for CVE-2007-6239 (CVE-2008-1612).
An invalid version number in a HTTP request may trigger an assertion in HttpMsg.c and HttpStatusLine.c (CVE-2009-0478).

Impact

The issues allows for Denial of Service attacks against the service via an HTTP request with an invalid version number and other specially crafted requests.

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-2.7.6"

4. References