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USN-253-1: heimdal vulnerability

18 February 2006

heimdal vulnerability



A remote Denial of Service vulnerability was discovered in the heimdal
implementation of the telnet daemon. A remote attacker could force the
server to crash due to a NULL de-reference before the user logged in,
resulting in inetd turning telnetd off because it forked too fast.

Please note that the heimdal-servers package is not officially
supported in Ubuntu (it is in the 'universe' component of the
archive). However, this affects you if you use a customized version
built from the heimdal source package (which is supported).

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 5.10
  • heimdal-servers -
Ubuntu 5.04
  • heimdal-servers -
Ubuntu 4.10
  • heimdal-servers -

In general, a standard system update will make all the necessary changes.