Red Hat Bugzilla – Bug 162255
CAN-2005-1175 krb5 buffer overflow in KDC
Last modified: 2007-11-30 17:07:07 EST
+++ This bug was initially created as a clone of Bug #157103 +++ Additionally, the same request, when received by the KDC via either TCP or UDP, can trigger a bug in the krb5 library which results in a single-byte overflow of a heap buffer. Additionally, application servers are vulnerable to a highly improbable attack, provided that the attacker controls a realm sharing a cross-realm key with the target realm. [CAN-2005-1175] An unauthenticated attacker may be able to use this vulnerability to execute arbitrary code on the KDC host, potentially compromising an entire Kerberos realm. No exploit code is known to exist at this time. Exploitation of these vulnerabilities is believed to be difficult.
This issue also affects RHEL2.1
According to MIT, the attacker must control a realm sharing a cross-realm key with the target realm. I'm lowering the severity to "moderate".
Public at http://web.mit.edu/kerberos/www/advisories/, removing embargo
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-562.html