Mandriva Linux Security Advisory 2011-055 - chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration with a chain overlay and ppolicy_forward_updates is used, allows remote authenticated users to bypass external-program authentication by sending an invalid password to a slave server. modrdn.c in slapd in OpenLDAP 2.4.x before 2.4.24 allows remote attackers to cause a denial of service via a relative Distinguished Name that contains an empty value for the OldDN field.
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