OpenLDAP: Denial of Service vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200611-25 / openldap
Release Date	November 28, 2006
Latest Revision	November 28, 2006: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-nds/openldap	< 2.3.27-r3	>= 2.3.27-r3, revision >= 2.2.28-r5, revision >= 2.1.30-r8	All supported architectures

Related bugreports: #154349

Synopsis

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

2. Impact Information

Background

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

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.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All OpenLDAP users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4. References

CVE-2006-5779

Updated November 28, 2006

Summary: This is a Gentoo Linux Security Advisory

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