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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200312-05">
<title>GnuPG: ElGamal signing keys compromised and format string vulnerability</title>
<synopsis>
A bug in GnuPG allows ElGamal signing keys to be compromised, and a format
string bug in the gpgkeys_hkp utility may allow arbitrary code execution.
</synopsis>
<product type="ebuild">GnuPG</product>
<announced>2003-12-12</announced>
<revised>2003-12-12: 01</revised>
<bug>34504</bug>
<access>unknown</access>
<affected>
<package name="app-crypt/gnupg" auto="yes" arch="*">
<unaffected range="ge">1.2.3-r5</unaffected>
<vulnerable range="le">1.2.3-r4</vulnerable>
</package>
</affected>
<background>
<p>
GnuPG is a popular open source signing and encryption tool.
</p>
</background>
<description>
<p>
Two flaws have been found in GnuPG 1.2.3.
</p>
<p>
First, ElGamal signing keys can be compromised. These keys are not commonly
used, but this is "a significant security failure which can lead to a
compromise of almost all ElGamal keys used for signing. Note that this is a
real world vulnerability which will reveal your private key within a few
seconds".
</p>
<p>
Second, there is a format string flaw in the 'gpgkeys_hkp' utility which
"would allow a malicious keyserver in the worst case to execute an arbitrary
code on the user's machine."
</p>
</description>
<impact type="minimal">
<p>
If you have used ElGamal keys for signing your private key can be
compromised, and a malicious keyserver could remotely execute arbitrary code
with the permissions of the user running gpgkeys_hkp.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All users who have created ElGamal signing keys should immediately revoke
them. In addition, all Gentoo Linux machines with gnupg installed should be
updated to use gnupg-1.2.3-r5 or higher:
</p>
<code>
# emerge sync
# emerge -pv '&gt;=app-crypt/gnupg-1.2.3-r5'
# emerge '&gt;=app-crypt/gnupg-1.2.3-r5'
# emerge clean</code>
</resolution>
<references>
<uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0971">CAN-2003-0971</uri>
<uri link="http://marc.theaimsgroup.com/?l=gnupg-announce&amp;m=106992378510843&amp;q=raw">GnuPG Announcement</uri>
<uri link="http://www.s-quadra.com/advisories/Adv-20031203.txt">S-Quadra Advisory</uri>
</references>
</glsa>