OpenLDAP: Denial of Service vulnerabilities

Background

OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.

Description

The following errors have been discovered in OpenLDAP:

• Tony Blake discovered an error which exists within the normalisation of “objectClasses” (CVE-2007-5707).
• Thomas Sesselmann reported that, when running as a proxy-caching server the “add_filter_attrs()” function in servers/slapd/overlay/pcache.c does not correctly NULL terminate “new_attrs” (CVE-2007-5708).
• A double-free bug exists in attrs_free() in the file servers/slapd/back-bdb/modrdn.c, which was discovered by Jonathan Clarke (CVE-2008-0658).

Impact

A remote attacker can cause a Denial of Serivce by sending a malformed “objectClasses” attribute, and via unknown vectors that prevent the “new_attrs” array from being NULL terminated, and via a modrdn operation with a NOOP (LDAP_X_NO_OPERATION) control.

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-2.3.41"