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Heimdal: Buffer overflow vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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.


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


There is no known workaround at this time.


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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