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heimdal kadmind remote heap buffer overflow


An input validation error was discovered in the kadmind code that handles the framing of Kerberos 4 compatibility administration requests. The code assumed that the length given in the framing was always two or more bytes. Smaller lengths will cause kadmind to read an arbitrary amount of data into a minimally-sized buffer on the heap.

A remote attacker may send a specially formatted message to kadmind, causing it to crash or possibly resulting in arbitrary code execution.

The kadmind daemon is part of Kerberos 5 support. However, this bug will only be present if kadmind was built with additional Kerberos 4 support. Thus, only systems that have *both* Heimdal Kerberos 5 and Kerberos 4 installed might be affected.

NOTE: On FreeBSD 4 systems, `kadmind' may be installed as `k5admind'.



portaudit: heimdal kadmind remote heap buffer overflow

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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Officer. Refer to "FreeBSD Security Information" for more information.

Oliver Eikemeier <>