Heimdal: Buffer overflow vulnerabilities

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200504-28 / Heimdal
Release Date	April 28, 2005
Latest Revision	April 28, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-crypt/heimdal	< 0.6.4	>= 0.6.4	All supported architectures

Related bugreports: #89861

Synopsis

Buffer overflow vulnerabilities have been found in the telnet client in Heimdal which could lead to execution of arbitrary code.

2. Impact Information

Background

Heimdal is a free implementation of Kerberos 5 that includes a telnet client program.

Description

Buffer overflow vulnerabilities in the slc_add_reply() and env_opt_add() functions have been discovered by Gael Delalleau in the telnet client in Heimdal.

Impact

Successful exploitation would require a vulnerable user to connect to an attacker-controlled host using the telnet client, potentially executing arbitrary code with the permissions of the user running the application.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Heimdal users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/heimdal-0.6.4"

4. References

Page updated April 28, 2005

Summary: This is a Gentoo Linux Security Advisory

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