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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>