Serv-U up to 5.2 Denial of Service

[Patrick <patrickthomassen@xxxxxxxxx>]

Serv-U FTP server is a secure, advanced FTP server for Windows. However, like 
most programs, it is not completely bugfree.

I (and maybe more people with me) found this bug some time ago. It can be 
triggered as *every* user that can log in, anonymous included, and exists in 
possibly every version. (At least 4.x and 5.x series).

The exploit might be a cliché but it might threaten (hosting and other) 
companies that use this FTP server.

Following commands will trigger the crash:

STOU COM1
STOU LPT1
STOU PRN
STOU AUX

However, "STOU NUL" does NOT work.

Greetings,
Patrick