io12 / Pwninit
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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 segfaultlesslyLD_PRELOAD
the provided libc - Download debug symbols and unstrip the 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
.
solve.py
template
Custom 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
.
solve.py
Persisting custom 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
fetching linker
unstripping libc
setting ./ld-2.23.so executable
writing solve.py stub
$ ls
hunter ld-2.23.so libc.so.6 readme solve.py
solve.py
:
#!/usr/bin/env python3
from pwn import *
exe = ELF("./hunter")
libc = ELF("./libc.so.6")
ld = ELF("./ld-2.23.so")
context.binary = exe
def conn():
if args.LOCAL:
return process([ld.path, exe.path], env={"LD_PRELOAD": libc.path})
else:
return remote("addr", 1337)
def main():
r = conn()
# good luck pwning :)
r.interactive()
if __name__ == "__main__":
main()