vsftpd Smiley Face Backdoor

This script is Copyright (C) 2011 Tenable Network Security, Inc.


Synopsis :

The remote FTP server contains a backdoor allowing execution of
arbitrary code.

Description :

The version of vsftpd running on the remote host has been compiled
with a backdoor. Attempting to login with a username containing :)
(a smiley face) triggers the backdoor, which results in a shell
listening on TCP port 6200. The shell stops listening after a client
connects to and disconnects from it.

An unauthenticated, remote attacker could exploit this to execute
arbitrary code as root.

See also :

http://pastebin.com/AetT9sS5
http://www.nessus.org/u?abcbc915

Solution :

Validate and recompile a legitimate copy of the source code.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 8.3
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: FTP

Nessus Plugin ID: 55523 ()

Bugtraq ID: 48539

CVE ID: