(RHSA-2008:0181) Critical: krb5 security update

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.

A flaw was found in the way the MIT Kerberos Authentication Service and Key
Distribution Center server (krb5kdc) handled Kerberos v4 protocol packets.
An unauthenticated remote attacker could use this flaw to crash the
krb5kdc daemon, disclose portions of its memory, or possibly execute
arbitrary code using malformed or truncated Kerberos v4 protocol
requests. (CVE-2008-0062, CVE-2008-0063)

This issue only affected krb5kdc with Kerberos v4 protocol compatibility
enabled, which is the default setting on Red Hat Enterprise Linux 4.
Kerberos v4 protocol support can be disabled by adding “v4_mode=none”
(without the quotes) to the “[kdcdefaults]” section of
/var/kerberos/krb5kdc/kdc.conf.

A flaw was found in the RPC library used by the MIT Kerberos kadmind
server. An unauthenticated remote attacker could use this flaw to crash
kadmind. This issue only affected systems with certain resource limits
configured and did not affect systems using default resource limits used by
Red Hat Enterprise Linux 2.1 or 3. (CVE-2008-0948)

Red Hat would like to thank MIT for reporting these issues.

All krb5 users are advised to update to these erratum packages which
contain backported fixes to correct these issues.