Heimdal: Kerberos 4 buffer overflow in kadmin — GLSA 200405-23

A possible buffer overflow in the Kerberos 4 component of Heimdal has been discovered.

Affected packages

Package 	app-crypt/heimdal on all architectures
Affected versions 	< 0.6.2
Unaffected versions 	>= 0.6.2

Background

Heimdal is a free implementation of Kerberos.

Description

A buffer overflow was discovered in kadmind, a server for administrative access to the Kerberos database.

Impact

By sending a specially formatted message to kadmind, a remote attacker may be able to crash kadmind causing a denial of service, or execute arbitrary code with the permissions of the kadmind process.

Workaround

For a temporary workaround, providing you do not require Kerberos 4 support, you may turn off Kerberos 4 kadmin by running kadmind with the --no-kerberos4 option.

Resolution

All Heimdal users should upgrade to the latest stable version:

 # emerge sync

 # emerge -pv ">=app-crypt/heimdal-0.6.2"
 # emerge ">=app-crypt/heimdal-0.6.2"

References

    Heimdal 0.6.2 Release Notice
    CAN-2004-0434