glsa-200603-15.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="200603-15">
  <title>Crypt::CBC: Insecure initialization vector</title>
  <synopsis>
    Crypt::CBC uses an insecure initialization vector, potentially resulting in
    a weaker encryption.
  </synopsis>
  <product type="ebuild">crypt-cbc</product>
  <announced>March 17, 2006</announced>
  <revised>March 17, 2006: 01</revised>
  <bug>126048</bug>
  <access>remote</access>
  <affected>
    <package name="dev-perl/crypt-cbc" auto="yes" arch="*">
      <unaffected range="ge">2.17</unaffected>
      <vulnerable range="lt">2.17</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Crypt::CBC is a Perl module to encrypt data using cipher block
    chaining (CBC).
    </p>
  </background>
  <description>
    <p>
    Lincoln Stein discovered that Crypt::CBC fails to handle 16 bytes
    long initializiation vectors correctly when running in the RandomIV
    mode, resulting in a weaker encryption because the second part of every
    block will always be encrypted with zeros if the blocksize of the
    cipher is greater than 8 bytes.
    </p>
  </description>
  <impact type="low">
    <p>
    An attacker could exploit weak ciphertext produced by Crypt::CBC
    to bypass certain security restrictions or to gain access to sensitive
    data.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All Crypt::CBC users should upgrade to the latest available
    version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=dev-perl/crypt-cbc-2.17&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0898">CVE-2006-0898</uri>
  </references>
  <metadata tag="requester" timestamp="Tue, 14 Mar 2006 21:26:26 +0000">
    koon
  </metadata>
  <metadata tag="bugReady" timestamp="Tue, 14 Mar 2006 21:26:50 +0000">
    koon
  </metadata>
  <metadata tag="submitter" timestamp="Tue, 14 Mar 2006 23:04:56 +0000">
    DerCorny
  </metadata>
</glsa>