Gentoo: 201309-01 Cyrus-SASL: Denial of Service
Posted by Benjamin D. Thomas   
Gentoo A NULL pointer dereference in Cyrus-SASL may allow remote attackers to cause a Denial of Service condition.
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Gentoo Linux Security Advisory                           GLSA 201309-01
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                                            http://security.gentoo.org/
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 Severity: Normal
    Title: Cyrus-SASL: Denial of Service
     Date: September 01, 2013
     Bugs: #476764
       ID: 201309-01

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Synopsis
========

A NULL pointer dereference in Cyrus-SASL may allow remote attackers to
cause a Denial of Service condition.

Background
==========

Cyrus-SASL is an implementation of the Simple Authentication and
Security Layer.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  dev-libs/cyrus-sasl        < 2.1.26-r3              >= 2.1.26-r3

Description
===========

In the GNU C Library (glibc) from version 2.17 onwards, the crypt()
function call can return NULL when the salt violates specifications or
the system is in FIPS-140 mode and a DES or MD5 hashed password is
passed. When Cyrus-SASL's authentication mechanisms call crypt(), a
NULL may be returned.

Impact
======

A remote attacker could trigger this vulnerability to cause a Denial of
Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Cyrus-SASL users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=dev-libs/cyrus-sasl-2.1.26-r3"

References
==========

[ 1 ] CVE-2013-4122
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4122

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 http://security.gentoo.org/glsa/glsa-201309-01.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
https://bugs.gentoo.org.

License

Copyright 2013 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/2.5