JunkBuster: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200504-11 / junkbuster
Release Date	April 13, 2005
Latest Revision	April 21, 2005: 02
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-proxy/junkbuster	< 2.0.2-r3	>= 2.0.2-r3	All supported architectures

Related bugreports: #88537

Synopsis

JunkBuster is vulnerable to a heap corruption vulnerability, and under certain configurations may allow an attacker to modify settings.

2. Impact Information

Background

JunkBuster is a filtering HTTP proxy, designed to enhance privacy and remove unwanted content.

Description

James Ranson reported a vulnerability when JunkBuster is configured to run in single-threaded mode, an attacker can modify the referrer setting by getting a victim to request a specially crafted URL (CAN-2005-1108). Tavis Ormandy of the Gentoo Linux Security Audit Team identified a heap corruption issue in the filtering of URLs (CAN-2005-1109).

Impact

If JunkBuster has been configured to run in single-threaded mode, an attacker can disable or modify the filtering of Referrer: HTTP headers, potentially compromising the privacy of users. The heap corruption vulnerability could crash or disrupt the operation of the proxy, potentially executing arbitrary code.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All JunkBuster users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-proxy/junkbuster-2.0.2-r3"

4. References

Updated April 13, 2005

Summary: This is a Gentoo Linux Security Advisory

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