Date: Sun, 06 Mar 2005 14:15:52 +0100
From: Thierry Carrez <koon@gentoo.org.>
To: gentoo-announce@lists.gentoo.org
Subject: [ GLSA 200503-12 ] Hashcash: Format string vulnerability
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Gentoo Linux Security Advisory GLSA 200503-12
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http://security.gentoo.org/
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Severity: Normal
Title: Hashcash: Format string vulnerability
Date: March 06, 2005
Bugs: #83541
ID: 200503-12
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Synopsis
========
A format string vulnerability in the Hashcash utility could allow an
attacker to execute arbitrary code.
Background
==========
Hashcash is a utility for generating Hashcash tokens, a proof-of-work
system to reduce the impact of spam.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 net-misc/hashcash < 1.16-r1 >= 1.16-r1
Description
===========
Tavis Ormandy of the Gentoo Linux Security Audit Team identified a flaw
in the Hashcash utility that an attacker could expose by specifying a
malformed reply address.
Impact
======
Successful exploitation would permit an attacker to disrupt Hashcash
users, and potentially execute arbitrary code.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All Hashcash users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/hashcash-1.16-r1"
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200503-12.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
http://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.
http://creativecommons.org/licenses/by-sa/2.0
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