krb5: KDC hang when using LDAP backend caused by special principal name (MITKRB5-SA-2011-002)

The unparse implementation in the Key Distribution Center KDC in MIT Kerberos 5 aka krb5 1.6.x through 1.9, when an LDAP backend is used, allows remote attackers to cause a denial of service file descriptor exhaustion and daemon hang via a principal name that triggers use of a backslash escape...