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Gentoo Linux Security Advisory                           GLSA 200504-11
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                                            https://security.gentoo.org/
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  Severity: High
     Title: JunkBuster: Multiple vulnerabilities
      Date: April 13, 2005
      Bugs: #88537
        ID: 200504-11

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

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

Affected packages
================
    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  www-proxy/junkbuster     < 2.0.2-r3                   >= 2.0.2-r3

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. Tavis
Ormandy of the Gentoo Linux Security Audit Team identified a heap
corruption issue in the filtering of URLs.

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.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All JunkBuster users should upgrade to the latest version:

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

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/200504-11

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/.

License
======
Copyright 2005 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.0/