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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>