This script is Copyright (C) 2010-2011 Tenable Network Security, Inc.
The FTP server contains a backdoor allowing execution of arbitrary
The remote host is using ProFTPD, a free FTP server for Unix and
The version of ProFTPD installed on the remote host has been compiled
with a backdoor in 'src/help.c', apparently related to a compromise of
the main distribution server for the ProFTPD project on the 28th of
November 2010 around 20:00 UTC and not addressed until the 2nd of
By sending a special HELP command, an unauthenticated, remote attacker
can gain a shell and execute arbitrary commands with system
Note that the compromised distribution file also contained code that
ran as part of the initial configuration step and sent a special HTTP
request to a server in Saudi Arabia. If this install was built from
source, you should assume that the author of the backdoor is already
aware of it.
See also :
Reinstall the host from known, good sources.
Risk factor :
Critical / CVSS Base Score : 10.0
CVSS Temporal Score : 8.3
Public Exploit Available : true