Ubuntu Security Notice USN-253-1
17th February, 2006
heimdal vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 5.10
- Ubuntu 5.04
- Ubuntu 4.10
Details
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 version:
- Ubuntu 5.10:
- heimdal-servers
- Ubuntu 5.04:
- heimdal-servers
- Ubuntu 4.10:
- heimdal-servers
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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