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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200609-15">
<title>GnuTLS: RSA Signature Forgery</title>
<synopsis>
GnuTLS fails to handle excess data which could allow an attacker to forge a
PKCS #1 v1.5 signature.
</synopsis>
<product type="ebuild">gnutls</product>
<announced>2006-09-26</announced>
<revised>2006-09-26: 01</revised>
<bug>147682</bug>
<access>remote</access>
<affected>
<package name="net-libs/gnutls" auto="yes" arch="*">
<unaffected range="ge">1.4.4</unaffected>
<vulnerable range="lt">1.4.4</vulnerable>
</package>
</affected>
<background>
<p>
GnuTLS is an implementation of SSL 3.0 and TLS 1.0.
</p>
</background>
<description>
<p>
verify.c fails to properly handle excess data in
digestAlgorithm.parameters field while generating a hash when using an
RSA key with exponent 3. RSA keys that use exponent 3 are commonplace.
</p>
</description>
<impact type="normal">
<p>
Remote attackers could forge PKCS #1 v1.5 signatures that are signed
with an RSA key, preventing GnuTLS from correctly verifying X.509 and
other certificates that use PKCS.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All GnuTLS users should update both packages:
</p>
<code>
# emerge --sync
# emerge --update --ask --verbose ">=net-libs/gnutls-1.4.4"</code>
</resolution>
<references>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4790">CVE-2006-4790</uri>
</references>
<metadata tag="requester" timestamp="2006-09-23T06:35:02Z">
jaervosz
</metadata>
<metadata tag="submitter" timestamp="2006-09-25T13:07:32Z">
hlieberman
</metadata>
<metadata tag="bugReady" timestamp="2006-09-25T18:24:37Z">
falco
</metadata>
</glsa>
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