Mailing the story:
Slackware alert: WU-FTPD Security Advisory (SSA:2003-259-03)
Upgraded WU-FTPD packages are available for Slackware 9.0 and
- -current. These fix a problem where an attacker could use a
specially crafted filename in conjunction with WU-FTPD's
conversion feature (mostly used to compress files, or produce tar
archives) to execute arbitrary commands on the server.