From: Stefan Cornelius <dercorny@gentoo.org.>
To: gentoo-announce@lists.gentoo.org
Subject: [ GLSA 200603-15 ] Crypt::CBC: Insecure initialization vector
Date: Fri, 17 Mar 2006 19:04:39 +0100
User-Agent: KMail/1.9.1
Cc: bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk,
security-alerts@linuxsecurity.com
MIME-Version: 1.0
Content-Type: multipart/signed;
boundary="nextPart1365484.i2OVyWy0I8";
protocol="application/pgp-signature";
micalg=pgp-sha1
Content-Transfer-Encoding: 7bit
Message-Id: <200603171904.44570.dercorny@gentoo.org.>
X-Virus-Scanned: antivirus-gw at tyumen.ru
--nextPart1365484.i2OVyWy0I8
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 200603-15
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Low
Title: Crypt::CBC: Insecure initialization vector
Date: March 17, 2006
Bugs: #126048
ID: 200603-15
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
========
Crypt::CBC uses an insecure initialization vector, potentially
resulting in a weaker encryption.
Background
==========
Crypt::CBC is a Perl module to encrypt data using cipher block chaining
(CBC).
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-perl/crypt-cbc < 2.17 >= 2.17
Description
===========
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.
Impact
======
An attacker could exploit weak ciphertext produced by Crypt::CBC to
bypass certain security restrictions or to gain access to sensitive
data.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All Crypt::CBC users should upgrade to the latest available version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-perl/crypt-cbc-2.17"
References
==========
[ 1 ] CVE-2006-0898
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0898
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200603-15.xml
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2006 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
--nextPart1365484.i2OVyWy0I8
Content-Type: application/pgp-signature
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (GNU/Linux)
iD8DBQBEGvo8Epc7MgVybcQRAlTZAJ9Aobp6DSxxDFiSwF3PLp2DagNSPgCfdxfn
ceuPesixKKT+FjdUy4NmVtU=
=/n7/
-----END PGP SIGNATURE-----
--nextPart1365484.i2OVyWy0I8--
