Updated Kerberos (krb5) packages that correct a buffer overflow bug are now available for CentOS Linux 4. This update has been rated as having moderate security impact by the CentOS Security Response Team.
Kerberos is a networked authentication system that uses a trusted third party (a KDC) to authenticate clients and servers to each other. A heap based buffer overflow bug was found in the administration library of Kerberos 1.3.5 and earlier. This bug could allow an authenticated remote attacker to execute arbitrary commands on a realm's master Kerberos KDC. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-1189 to this issue. All users of krb5 should upgrade to these updated packages, which contain backported security patches to resolve these issues.