[Full-disclosure] [ GLSA 200611-25 ] OpenLDAP: Denial of Service vulnerability

[Raphael Marichez]

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Gentoo Linux Security Advisory                           GLSA 200611-25
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: OpenLDAP: Denial of Service vulnerability
      Date: November 28, 2006
      Bugs: #154349
        ID: 200611-25

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Synopsis
========

A flaw in OpenLDAP allows remote unauthenticated attackers to cause a
Denial of Service.

Background
==========

OpenLDAP is a suite of LDAP-related applications and development tools.

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

    -------------------------------------------------------------------
     Package           /   Vulnerable   /                   Unaffected
    -------------------------------------------------------------------
  1  net-nds/openldap      < 2.3.27-r3                    >= 2.3.27-r3
                                                         *>= 2.2.28-r5
                                                         *>= 2.1.30-r8

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

Evgeny Legerov has discovered that the truncation of an incoming
authcid longer than 255 characters and ending with a space as the 255th
character will lead to an improperly computed name length. This will
trigger an assert in the libldap code.

Impact
======

By sending a BIND request with a specially crafted authcid parameter to
an OpenLDAP service, a remote attacker can cause the service to crash.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OpenLDAP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose "net-nds/openldap"

References
==========

  [ 1 ] CVE-2006-5779
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5779

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

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

  http://security.gentoo.org/glsa/glsa-200611-25.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 at 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/2.5
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