zoo -- stack based buffer overflow

Jean-Sébastien Guay-Leroux report a vulnerability
within the zoo archiver. The vulnerability which is present
in the fullpath() function (from the misc.c file) is caused by
improper checking of user supplied data. The data returned
to the buffer can be up to 512 bytes, while the buffer is
created to hold 256 bytes. This could result in a buffer
overflow which could allow remote code execution.