Heimdal: Kerberos 4 buffer overflow in kadmin

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200405-23 / Heimdal
Release Date	May 27, 2004
Latest Revision	May 27, 2004: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-crypt/heimdal	< 0.6.2	>= 0.6.2	All supported architectures

Related bugreports: #50208

Synopsis

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

2. Impact Information

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.

3. Resolution Information

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:

Code Listing 3.1: Resolution

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

4. References

Page updated May 27, 2004

Summary: This is a Gentoo Linux Security Advisory

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