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TUCoPS :: Windows Net Apps :: hack1237.htm

Serv-U up to 5.2 DoS



Serv-U up to 5.2 Denial of Service



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


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