full-disclosure - [ GLSA 200603-15 ] Crypt::CBC: Insecure initialization vector

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <200603171904.44570.dercorny@gentoo.org>
Date: Fri Mar 17 18:05:44 2006
From: dercorny at gentoo.org (Stefan Cornelius)
Subject: [ GLSA 200603-15 ] Crypt::CBC: Insecure
	initialization vector

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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@...too.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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 191 bytes
Desc: not available
Url : http://lists.grok.org.uk/pipermail/full-disclosure/attachments/20060317/21708215/attachment.bin