73 lines
2.6 KiB
XML
73 lines
2.6 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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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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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="200603-08">
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<title>GnuPG: Incorrect signature verification</title>
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<synopsis>
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GnuPG may erroneously report a modified or unsigned message has a valid
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digital signature.
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</synopsis>
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<product type="ebuild">gnupg</product>
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<announced>March 10, 2006</announced>
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<revised>March 10, 2006: 01</revised>
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<bug>125217</bug>
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<access>remote</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">1.4.2.2</unaffected>
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<vulnerable range="lt">1.4.2.2</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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The GNU Privacy Guard, GnuPG, is a free replacement for the PGP
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suite of cryptographic software that may be used without restriction,
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as it does not rely on any patented algorithms. GnuPG can be used to
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digitally sign messages, a method of ensuring the authenticity of a
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message using public key cryptography.
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</p>
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</background>
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<description>
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<p>
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OpenPGP is the standard that defines the format of digital
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signatures supported by GnuPG. OpenPGP signatures consist of multiple
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sections, in a strictly defined order. Tavis Ormandy of the Gentoo
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Linux Security Audit Team discovered that certain illegal signature
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formats could allow signed data to be modified without detection. GnuPG
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has previously attempted to be lenient when processing malformed or
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legacy signature formats, but this has now been found to be insecure.
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</p>
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</description>
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<impact type="normal">
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<p>
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A remote attacker may be able to construct or modify a
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digitally-signed message, potentially allowing them to bypass
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authentication systems, or impersonate another user.
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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 GnuPG users should upgrade to the latest version:
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</p>
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<code>
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# emerge --sync
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# emerge --ask --oneshot --verbose ">=app-crypt/gnupg-1.4.2.2"</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=CVE-2006-0049">CVE-2006-0049</uri>
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<uri link="http://lists.gnupg.org/pipermail/gnupg-announce/2006q1/000216.html">GnuPG Announcement</uri>
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</references>
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<metadata tag="submitter" timestamp="Wed, 08 Mar 2006 22:34:09 +0000">
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taviso
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</metadata>
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<metadata tag="bugReady" timestamp="Fri, 10 Mar 2006 21:32:19 +0000">
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koon
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</metadata>
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</glsa>
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