MIT Kerberos 5: Denial of service

Background

The MIT Kerberos 5 implementation provides a command line telnet client which is used for remote login via the telnet protocol.

Description

It was discovered that MIT Kerberos network authentication system, krb5, did not properly handle ASN.1-encoded Kerberos messages.

Impact

A remote attacker could send a specially crafted Kerberos message, possibly resulting in a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All MIT Kerberos 5 users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.18.2-r2"