https://github.com/gfelber/vagd
VirtuAlization GDb integrations in pwntools
https://github.com/gfelber/vagd
ctf docker pwntools python qemu
Last synced: about 1 year ago
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VirtuAlization GDb integrations in pwntools
- Host: GitHub
- URL: https://github.com/gfelber/vagd
- Owner: gfelber
- License: gpl-3.0
- Created: 2023-02-24T19:53:24.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2024-10-23T17:12:42.000Z (over 1 year ago)
- Last Synced: 2024-10-24T00:37:15.878Z (over 1 year ago)
- Topics: ctf, docker, pwntools, python, qemu
- Language: Python
- Homepage:
- Size: 270 KB
- Stars: 26
- Watchers: 2
- Forks: 0
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
[](https://pypi.org/project/vagd/) [](https://vagd.gfelber.dev)
# VAGD
VirtuAlization GDb integrations in pwntools
## Installation
```bash
pip install vagd
```
or from repo with
```bash
git clone https://github.com/gfelber/vagd
pip install ./vagd/
```
## Usage
- `vagd template [OPTIONS] [BINARY] [IP] [PORT]` to generate a template, list OPTIONS with help `-h`
```python
from pwn import *
GOFF = 0x555555554000 # GDB default base address
IP = '' # remote IP
PORT = 0 # remote PORT
BINARY = '' # PATH to local binary
ARGS = [] # ARGS supplied to binary
ENV = {} # ENV supplied to binary
# GDB SCRIPT, executed at start of GDB session (e.g. set breakpoints here)
GDB = f"""
set follow-fork-mode parent
c"""
context.binary = exe = ELF(BINARY, checksec=False) # binary
context.aslr = False # ASLR enabled (only GDB)
vm = None
# setup vagd vm
def setup():
global vm
if args.REMOTE or args.LOCAL:
return
try:
# only load vagd if needed
from vagd import Dogd, Qegd, Box
except:
log.error('Failed to import vagd, either run locally using LOCAL or install it')
if not vm:
vm = Dogd(BINARY, image=Box.DOCKER_UBUNTU, ex=True, fast=True) # Docker
# vm = Qegd(BINARY, img=Box.QEMU_UBUNTU, ex=True, fast=True) # Qemu
if vm.is_new:
# additional setup here
log.info('new vagd instance')
# get target (pwnlib.tubes.tube)
def get_target(**kw) -> tubes.tube:
if args.REMOTE:
# context.log_level = 'debug'
return remote(IP, PORT)
if args.LOCAL:
if args.GDB:
return gdb.debug([BINARY] + ARGS, env=ENV, gdbscript=GDB, **kw)
return process([BINARY] + ARGS, env=ENV, **kw)
return vm.start(argv=ARGS, env=ENV, gdbscript=GDB, **kw)
setup()
#===========================================================
# EXPLOIT STARTS HERE
#===========================================================
# libc = ELF('', checksec=False)
t = get_target()
t.interactive() # or it()
```
- `vagd info BINARY` to print info about binary
```bash
# run as process in VM
./exploit.py
# run as gdb server in VM requires tmux
./exploit.py GDB
# run on remote IP:PORT
./exploit.py REMOTE
# run process locally
./exploit.py LOCAL [GDB]
```
I recommend using [pwndbg](https://github.com/pwndbg/pwndbg).
## Files
All created files ares stored in the local `./.vagd/` directory. Additional large files (e.g. cloudimages) are stored in the home directory `~/.share/local/vagd/` or handled by tools themselfs (e.g. Docker).
## CLI
```bash
alias vagd="python -m vagd" # or install with pip / pipx
# help message
vagd -h
# analyses the binary, prints checksec and .comment (often includes Distro and Compiler info)
vagd info BINARY
# creates template, for more info use: vagd template -h
vagd template [OPTIONS] [BINARY] [IP] [PORT]
# ssh to current vagd instance, for more info use: vagd ssh -h
vagd ssh [OPTIONS]
# scp file to/from vagd instance, for more info use: vagd scp -h
# e.g. vagd scp ./test_file vagd:./ # vagd:./ is default target
vagd scp [OPTIONS] SOURCE [TARGET]
# stop and remove current vagd instance, for more info use: vagd clean -h
vagd clean [OPTIONS]
```
## [Documentation](https://vagd.gfelber.dev)
## Boxes
A listed of known working Boxes can be found in the [Documentation](http://vagd.gfelber.dev/autoapi/vagd/box/index.html#module-vagd.box).
Other images might also work but currently only distributions that use `apt` and alpine for Docker are supported.
This limitation may be circumvented by creating a target yourself (with the dependencies gdbserver, python, openssh) and creating a ssh connection via Shgd.
## Troubleshooting
### background processes
all instances continue to run in the background (after a vagd object has been started), this improves the runtime greatly after the first execution of the exploit. But this means that instances must be killed manually e.g.: `vagd clean`
### gdb & gdbserver
Because gdbserver is used to run binaries on the instances I recommend using [pwndbg](https://github.com/pwndbg/pwndbg). Other well known gdb plugins like [peda](https://github.com/longld/peda) aren't compatible with gdbserver and therefore won't work.
### files
files on the virtual instance are never overwritten this has performance reason (so files aren't always copied if the exploit is run). If you need to updated files on the remote either use `vagd scp` or create use temporary directories `Dogd(..., tmp=True)`
### gdb performance
Using gdbserver and gdb to index libraries can be very slow. Therefore an experimental feature is available that mounts libraries locally: `Dogd(..., ex=True, fast=True)`
## Future plans
### Better Docker integration
- migrate away from ssh (attach from host) to get lower latency
- additionally virtualize containers (Qemu) in order to change the used kernel