Several denial of service issues were fixed in the Kerberos Key Distribution Center (KDC).
Nalin Dahyabhai, Andrej Ota and Kyle Moffett discovered a NULL pointer dereference in the KDC LDAP backend. An unauthenticated remote attacker could use this to cause a denial of service. This issue affected Ubuntu 11.10. (CVE-2011-1527)
18 October 2011
A security issue affects these releases of Ubuntu and its derivatives:
Several denial of service issues were fixed in the Kerberos Key Distribution Center (KDC).
Nalin Dahyabhai, Andrej Ota and Kyle Moffett discovered a NULL pointer dereference in the KDC LDAP backend. An unauthenticated remote attacker could use this to cause a denial of service. This issue affected Ubuntu 11.10. (CVE-2011-1527)
Mark Deneen discovered that an assert() could be triggered in the krb5_ldap_lockout_audit() function in the KDC LDAP backend and the krb5_db2_lockout_audit() function in the KDC DB2 backend. An unauthenticated remote attacker could use this to cause a denial of service. (CVE-2011-1528)
It was discovered that a NULL pointer dereference could occur in the lookup_lockout_policy() function in the KDC LDAP and DB2 backends. An unauthenticated remote attacker could use this to cause a denial of service. (CVE-2011-1529)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.