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JunkBuster: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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).


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


There is no known workaround at this time.


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


Page updated April 13, 2005

Summary: This is a Gentoo Linux Security Advisory

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