Heimdal: Arbitrary code execution

Background

Heimdal is a free implementation of Kerberos 5.

Description

A boundary error in the “encrypt_keyid()” function in appl/telnet/libtelnet/encrypt.c of the telnet daemon and client could cause a buffer overflow.

Impact

An unauthenticated remote attacker may be able to execute arbitrary code with the privileges of the user running the telnet daemon or client, or cause Denial of Service.

Workaround

There is no known workaround at this time.

Resolution

All Heimdal users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-crypt/heimdal-1.5.1-r1"