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local http = require "http" local shortport = require "shortport" local stdnse = require "stdnse" local vulns = require "vulns" description = [[ Detects a denial of service vulnerability in the way the Apache web server handles requests for multiple overlapping/simple ranges of a page. References: * https://seclists.org/fulldisclosure/2011/Aug/175 * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3192 * https://www.tenable.com/plugins/nessus/55976 ]] --- -- @see http-slowloris-check.nse -- @see http-slowloris.nse -- -- @usage -- nmap --script http-vuln-cve2011-3192.nse [--script-args http-vuln-cve2011-3192.hostname=nmap.scanme.org] -pT:80,443 <host> -- -- @output -- Host script results: -- | http-vuln-cve2011-3192: -- | VULNERABLE: -- | Apache byterange filter DoS -- | State: VULNERABLE -- | IDs: CVE:CVE-2011-3192 BID:49303 -- | Description: -- | The Apache web server is vulnerable to a denial of service attack when numerous -- | overlapping byte ranges are requested. -- | Disclosure date: 2011-08-19 -- | References: -- | https://seclists.org/fulldisclosure/2011/Aug/175 -- | https://www.tenable.com/plugins/nessus/55976 -- | https://www.securityfocus.com/bid/49303 -- |_ https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3192 -- -- @args http-vuln-cve2011-3192.hostname Define the host name to be used in the HEAD request sent to the server -- @args http-vuln-cve2011-3192.path Define the request path -- changelog -- 2011-08-29 Duarte Silva <duarte.silva@serializing.me> -- - Removed the "Accept-Encoding" HTTP header -- - Removed response header printing -- * Changes based on Henri Doreau and David Fifield suggestions -- 2011-08-20 Duarte Silva <duarte.silva@serializing.me> -- * First version ;) -- 2011-11-07 Henri Doreau -- * Use the vulns library to report results ----------------------------------------------------------------------- author = "Duarte Silva <duarte.silva@serializing.me>" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"vuln", "safe"} portrule = shortport.http action = function(host, port) local vuln = { title = 'Apache byterange filter DoS', state = vulns.STATE.NOT_VULN, -- default IDS = {CVE = 'CVE-2011-3192', BID = '49303'}, description = [[ The Apache web server is vulnerable to a denial of service attack when numerous overlapping byte ranges are requested.]], references = { 'https://seclists.org/fulldisclosure/2011/Aug/175', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3192', 'https://www.tenable.com/plugins/nessus/55976', }, dates = { disclosure = {year = '2011', month = '08', day = '19'}, }, } local vuln_report = vulns.Report:new(SCRIPT_NAME, host, port) local hostname, path = stdnse.get_script_args('http-vuln-cve2011-3192.hostname', 'http-vuln-cve2011-3192.path') if not path then path = '/' stdnse.debug1("Setting the request path to '/' since 'http-vuln-cve2011-3192.path' argument is missing.") end -- This first request will try to get a code 206 reply from the server by -- sending the innocuous header "Range: byte=0-100" in order to detect -- whether this functionality is available or not. local request_opts = { header = { Range = "bytes=0-100", Connection = "close" }, bypass_cache = true } if hostname then request_opts.header.Host = hostname end local response = http.head(host, port, path, request_opts) if not response.status then stdnse.debug1("Functionality check HEAD request failed for %s (with path '%s').", hostname or host.ip, path) elseif response.status == 206 then -- The server handle range requests. Now try to request 11 ranges (one more -- than allowed). -- Vulnerable servers will reply with another code 206 response. Patched -- ones will return a code 200. request_opts.header.Range = "bytes=1-0,0-0,1-1,2-2,3-3,4-4,5-5,6-6,7-7,8-8,9-9,10-10" response = http.head(host, port, path, request_opts) if not response.status then stdnse.debug1("Invalid response from server to the vulnerability check") elseif response.status == 206 then vuln.state = vulns.STATE.VULN else stdnse.debug1("Server isn't vulnerable (%i status code)", response.status) end else stdnse.debug1("Server ignores the range header (%i status code)", response.status) end return vuln_report:make_output(vuln) end
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