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