[Full-Disclosure] [ GLSA 200503-12 ] Hashcash: Format string vulnerability

From: Thierry Carrez (koon_at_gentoo.org)
Date: 03/06/05

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    Date: Sun, 06 Mar 2005 14:15:52 +0100
To: gentoo-announce@lists.gentoo.org

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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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