GLSA 200501-25: Squid: Multiple vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	Squid: Multiple vulnerabilities
Date:	01/16/2005
Bugs:	#77934, #77521
ID:	200501-25

Synopsis

Squid contains vulnerabilities in the the code handling NTLM (NT Lan Manager), Gopher to HTML, ACLs and WCCP (Web Cache Communication Protocol) which could lead to ACL bypass, denial of service and arbitrary code execution.

Background

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

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-proxy/squid	< 2.5.7-r2	>= 2.5.7-r2	All supported architectures

Description

Squid contains a vulnerability in the gopherToHTML function (CAN-2005-0094) and incorrectly checks the 'number of caches' field when parsing WCCP_I_SEE_YOU messages (CAN-2005-0095). Furthermore the NTLM code contains two errors. One is a memory leak in the fakeauth_auth helper (CAN-2005-0096) and the other is a NULL pointer dereferencing error (CAN-2005-0097). Finally Squid also contains an error in the ACL parsing code (CAN-2005-0194).

Impact

With the WCCP issue an attacker could cause denial of service by sending a specially crafted UDP packet. With the Gopher issue an attacker might be able to execute arbitrary code by enticing a user to connect to a malicious Gopher server. The NTLM issues could lead to denial of service by memory consumption or by crashing Squid. The ACL issue could lead to ACL bypass.

Workaround

There is no known workaround at this time.

Resolution

All Squid users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-proxy/squid-2.5.7-r2"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200501-25.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.