msfpatterns 4.0.2

Generate/find patterns for use in stack smashing alla pattern_{create,offset}.rb from Metasploit

msfpatterns

msfpatterns (Buffer Overflow Finder) is a tool for generating and analyzing cyclic patterns, similar to pattern_create and pattern_offset from Metasploit. It helps exploit developers identify exact buffer overflow offsets across multiple architectures, including 16-bit, 32-bit, and 64-bit platforms.

Features

• Generate unique cyclic patterns for buffer overflow analysis
• Find offsets of overwritten return addresses in memory dumps
• Supports 2-byte, 4-byte, and 8-byte searches (suitable for MSP430, x86, x86-64, etc.)
• Returns all matching offsets (useful for 16-bit systems where repeats may occur)
• Simple CLI interface

Installation

Using uv (recommended)

uv tool install msfpatterns

Using pip

pip install msfpatterns

CLI Usage

Generating a Pattern

pattern 128 # Generates a pattern of length 128

Finding an Offset

pattern -q 0x41306241 128 # Find offset of 0x41306241 in a 128-byte pattern

Library Usage

You can also use msfpatterns as a Python library:

from msfpatterns import generate_pattern, find_offset

pattern = generate_pattern(128)
print(pattern)
offset = find_offset("0x41306241", 128)
print(f"Offset: {offset}")