OpenLDAP: Insecure usage of /tmp during installation

Background

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

Description

Tavis Ormandy of the Gentoo Linux Security Team has discovered that the file gencert.sh distributed with the Gentoo ebuild for OpenLDAP does not exit upon the existence of a directory in /tmp during installation allowing for directory traversal.

Impact

A local attacker could create a symbolic link in /tmp and potentially overwrite arbitrary system files upon a privileged user emerging OpenLDAP.

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"