glsa-200609-15.xml


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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>September 26, 2006</announced>
  <revised>September 26, 2006: 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 &quot;&gt;=net-libs/gnutls-1.4.4&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4790">CVE-2006-4790</uri>
  </references>
  <metadata tag="requester" timestamp="Sat, 23 Sep 2006 06:35:02 +0000">
    jaervosz
  </metadata>
  <metadata tag="submitter" timestamp="Mon, 25 Sep 2006 13:07:32 +0000">
    hlieberman
  </metadata>
  <metadata tag="bugReady" timestamp="Mon, 25 Sep 2006 18:24:37 +0000">
    falco
  </metadata>
</glsa>