Multiple format string vulnerabilities in the auth_ldap_log_reason function in Apache auth_ldap 1.6.0 and earlier allows remote attackers to execute arbitrary code via various vectors, including the username.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24030
http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2006:017
http://www.vupen.com/english/advisories/2006/0117
http://www.securityfocus.com/bid/16177
http://www.securityfocus.com/archive/1/421286/100/0/threaded
http://www.rudedog.org/auth_ldap/Changes.html
http://www.redhat.com/support/errata/RHSA-2006-0179.html
http://www.digitalarmaments.com/2006090173928420.html
http://www.debian.org/security/2006/dsa-952
http://securitytracker.com/id?1015456
http://secunia.com/advisories/18568
http://secunia.com/advisories/18412