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Gentoo Linux Security Advisory                           GLSA 200403-12
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                                             http://security.gentoo.org 
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  Severity: Normal
     Title: OpenLDAP DoS Vulnerability
      Date: March 31, 2004
      Bugs: #26728
        ID: 200403-12

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Synopsis
========

A failed password operation can cause the OpenLDAP slapd server, if it
is using the back-ldbm backend, to free memory that was never
allocated.

Background
==========

OpenLDAP is a suite of LDAP-related application and development tools.
It includes slapd (the standalone LDAP server), slurpd (the standalone
LDAP replication server), and various LDAP libraries, utilities and
example clients.

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

    -------------------------------------------------------------------
     Package           /   Vulnerable   /                   Unaffected
    -------------------------------------------------------------------
     net-nds/openldap       <= 2.1.12                        >= 2.1.13

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

A password extended operation (password EXOP) which fails will cause
the slapd server to free() an uninitialized pointer, possibly resulting
in a segfault. This only affects servers using the back-ldbm backend.

Such a crash is not guaranteed with every failed operation, however, it
is possible.

Impact
======

An attacker (or indeed, a normal user) may crash the OpenLDAP server,
creating a Denial of Service condition.

Workaround
==========

A workaround is not currently known for this issue. All users are
advised to upgrade to the latest version of the affected package.

Resolution
==========

OpenLDAP users should upgrade to version 2.1.13 or later:

    # emerge sync

    # emerge -pv ">=net-nds/openldap-2.1.13"
    # emerge ">=net-nds/openldap-2.1.13"

References
==========

  [ 1 ] http://www.openldap.org/its/index.cgi?findid=2390 

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. 
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