krb5 security update

CentOS Errata and Security Advisory CESA-2007:0384

Kerberos is a network authentication system which allows clients and
servers to authenticate to each other through use of symmetric encryption
and a trusted third party, the KDC. kadmind is the KADM5 administration
server.

David Coffey discovered an uninitialized pointer free flaw in the RPC
library used by kadmind. A remote unauthenticated attacker who can access
kadmind could trigger this flaw and cause kadmind to crash or potentially
execute arbitrary code as root. (CVE-2007-2442)

David Coffey also discovered an overflow flaw in the RPC library used by
kadmind. On Red Hat Enterprise Linux, exploitation of this flaw is limited
to a denial of service. A remote unauthenticated attacker who can access
kadmind could trigger this flaw and cause kadmind to crash. (CVE-2007-2443)

A stack buffer overflow flaw was found in kadmind. An authenticated
attacker who can access kadmind could trigger this flaw and potentially
execute arbitrary code on the Kerberos server. (CVE-2007-2798)

For Red Hat Enterprise Linux 2.1, several portability bugs which would lead
to unexpected crashes on the ia64 platform have also been fixed.

Users of krb5-server are advised to update to these erratum packages which
contain backported fixes to correct these issues.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2007-June/076136.html
https://lists.centos.org/pipermail/centos-announce/2007-June/076137.html
https://lists.centos.org/pipermail/centos-announce/2007-June/076165.html
https://lists.centos.org/pipermail/centos-announce/2007-June/076169.html

Affected packages:
krb5-devel
krb5-libs
krb5-server
krb5-workstation

Upstream details at:
https://access.redhat.com/errata/RHSA-2007:0384