Buffer overflow vulnerabilities have been found in the telnet client in Heimdal which could lead to execution of arbitrary code.
|Package||app-crypt/heimdal on all architectures|
|Affected versions||< 0.6.4|
|Unaffected versions||>= 0.6.4|
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.
There is no known workaround at this time.
All Heimdal users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=app-crypt/heimdal-0.6.4"
April 28, 2005
April 28, 2005: 01