Kerberos Security Update for VMware ESX 3.x
July 1st, 2009VMware Security Advisory
Advisory ID: VMSA-2009-0008
Synopsis: ESX Service Console update for krb5
Issue date: 2009-06-30
Updated on: 2009-06-30 (initial release of advisory)
CVE numbers: CVE-2009-0846
1. Summary
Service Console package krb5 has been updated to version
krb5-1.2.7-70.
2. Relevant releases
VMware ESX 3.5.0 without patch ESX350-200906407-SG
3. Problem Description
a. Service Console package krb5 update to version krb5-1.2.7-70
Kerberos is a network authentication protocol. It is designed to
provide strong authentication for client/server applications by
using secret-key cryptography.
An input validation flaw in the asn1_decode_generaltime function in
MIT Kerberos 5 before 1.6.4 allows remote attackers to cause a
denial of service or possibly execute arbitrary code via vectors
involving an invalid DER encoding that triggers a free of an
uninitialized pointer.
A remote attacker could use this flaw to crash a network service
using the MIT Kerberos library, such as kadmind or krb5kdc, by
causing it to dereference or free an uninitialized pointer or,
possibly, execute arbitrary code with the privileges of the user
running the service.
NOTE: ESX by default is unaffected by this issue, the daemons
kadmind and krb5kdc are not installed in ESX.



