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pwninit

A tool for automating starting binary exploit challenges

Features

  • Set challenge binary to be executable
  • Download a linker (ld-linux.so.*) that can segfaultlessly load the provided libc
  • Download debug symbols and unstrip the libc
  • Patch the binary with patchelf to use the correct RPATH and interpreter for the provided libc
  • Fill in a template pwntools solve script

Usage

Short version

Run pwninit

Long version

Run pwninit in a directory with the relevant files and it will detect which ones are the binary, libc, and linker. If the detection is wrong, you can specify the locations with --bin, --libc, and --ld.

Custom solve.py template

If you don't like the default template, you can use your own. Just specify --template-path <path>. Check template.py for the template format. The names of the exe, libc, and ld bindings can be customized with --template-bin-name, --template-libc-name, and --template-ld-name.

Persisting custom solve.py

You can make pwninit load your custom template automatically by adding an alias to your ~/.bashrc.

Example
alias pwninit='pwninit --template-path ~/.config/pwninit-template.py --template-bin-name e'

Install

Arch Linux

Install pwninit or pwninit-bin from the AUR.

Download

You can download non-GMO statically-linked musl binaries from the releases page.

Using cargo

cargo install pwninit

The binary will be placed in ~/.cargo/bin.

Note that openssl, liblzma, and pkg-config are required for the build.

Example

$ ls
hunter  libc.so.6  readme

$ pwninit
bin: ./hunter
libc: ./libc.so.6

setting ./hunter executable
fetching linker
unstripping libc
setting ./ld-2.23.so executable
copying ./hunter to ./hunter_patched
running patchelf on ./hunter_patched
writing solve.py stub

$ ls
hunter	hunter_patched	ld-2.23.so  libc.so.6  readme  solve.py

solve.py:

#!/usr/bin/env python3

from pwn import *

exe = ELF("./hunter_patched")
libc = ELF("./libc.so.6")
ld = ELF("./ld-2.23.so")

context.binary = exe


def conn():
    if args.LOCAL:
        return process([exe.path])
    else:
        return remote("addr", 1337)


def main():
    r = conn()

    # good luck pwning :)

    r.interactive()


if __name__ == "__main__":
    main()

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