glsa-200503-12.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="200503-12">
  <title>Hashcash: Format string vulnerability</title>
  <synopsis>
    A format string vulnerability in the Hashcash utility could allow an
    attacker to execute arbitrary code.
  </synopsis>
  <product type="ebuild">Hashcash</product>
  <announced>March 06, 2005</announced>
  <revised>May 22, 2006: 02</revised>
  <bug>83541</bug>
  <access>remote</access>
  <affected>
    <package name="net-misc/hashcash" auto="yes" arch="*">
      <unaffected range="ge">1.16-r1</unaffected>
      <vulnerable range="lt">1.16-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Hashcash is a utility for generating Hashcash tokens, a proof-of-work
    system to reduce the impact of spam.
    </p>
  </background>
  <description>
    <p>
    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.
    </p>
  </description>
  <impact type="normal">
    <p>
    Successful exploitation would permit an attacker to disrupt Hashcash
    users, and potentially execute arbitrary code.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All Hashcash users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=net-misc/hashcash-1.16-r1&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0687">CVE-2005-0687</uri>
  </references>
  <metadata tag="requester" timestamp="Wed,  2 Mar 2005 21:44:06 +0000">
    koon
  </metadata>
  <metadata tag="submitter" timestamp="Wed,  2 Mar 2005 22:42:04 +0000">
    taviso
  </metadata>
  <metadata tag="bugReady" timestamp="Sun,  6 Mar 2005 10:00:09 +0000">
    koon
  </metadata>
</glsa>