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Gentoo Linux Security Advisory                           GLSA 200503-12
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                                            https://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:

  https://security.gentoo.org/glsa/200503-12

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/