TITLE:
Typsoft FTP Server Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA17196

VERIFY ADVISORY:
http://secunia.com/advisories/17196/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
TYPSoft FTP Server 1.x
http://secunia.com/product/1358/

DESCRIPTION:
Donnie Werner has discovered a vulnerability in Typsoft FTP, which
can be exploited by malicious users to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error in handling the RETR
command. This can be exploited to crash the FTP service by sending
the "RETR" command without sending the "PORT" command.

The vulnerability has been confirmed in version 1.11. Prior versions
may also be affected.

NOTE: The vulnerability may only be exploitable in certain
configurations. e.g. using the default configured "Anonymous" user
account.

SOLUTION:
Grant only trusted users access to the FTP service.

PROVIDED AND/OR DISCOVERED BY:
Donnie Werner, Exploitlabs

ORIGINAL ADVISORY:
http://www.exploitlabs.com/files/advisories/EXPL-A-2005-016-typsoft-ftpd.txt

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