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1542[PHP-Exploit] PHPXMLRPC Library Remote Code Execution

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  • Shadow Warrior
    Jul 6, 2005
    • 0 Attachment
      Vendor : Useful Information Inc.
      URL : http://phpxmlrpc.sourceforge.net/
      Version : PHPXMLRPC 1.1 && Earlier
      Risk : Remote Code Execution

      PHPXMLRPC aka XML-RPC For PHP is a PHP implementation of the XML-RPC
      web RPC protocol, and was originally developed by Edd Dumbill of
      Useful Information Company. As of the 1.0 stable release, the project
      has been opened to wider involvement and moved to SourceForge.
      PHPXMLRPC is used in a large number of popular web applications such
      as PostNuke, Drupal, b2evolution, and TikiWiki. Unfortunately
      PHPXMLRPC is vulnerable to a remote php code execution vulnerability
      that may be exploited by an attacker to compromise a vulnerable system.

      Remote Command Execution:
      PHPXMLRPC is vulnerable to a very high risk remote php code execution
      vulnerability that may allow for an attacker to compromise a
      vulnerable webserver. The vulnerability is the result of unsanatized
      data being passed directly into an eval() call in the parseRequest()
      function of the XMLRPC server.

      // decompose incoming XML into request structure
      xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, true);
      xml_set_element_handler($parser, "xmlrpc_se", "xmlrpc_ee");
      xml_set_character_data_handler($parser, "xmlrpc_cd");
      xml_set_default_handler($parser, "xmlrpc_dh");
      if (!xml_parse($parser, $data, 1)) {
      // return XML error as a faultCode
      $r=new xmlrpcresp(0,
      sprintf("XML error: %s at line %d",
      } else {
      $m=new xmlrpcmsg($_xh[$parser]['method']);
      // now add parameters in
      for($i=0; $i\n";
      $plist.="$i - " . $_xh[$parser]['params'][$i]. " \n";
      eval('$m->addParam(' . $_xh[$parser]['params'][$i]. ");");

      By creating an XML file that uses single quotes to escape into the
      eval() call an attacker can easily execute php code on the target
      server. This has a lot to do with the fact that magic_quotes_gpc()
      does not apply to $HTTP_RAW_POST_DATA so using single quotes is not a

      <?xml version="1.0"?>
      <value><name>','')); phpinfo(); exit;/*</name></value>

      The above xml file when posted to the vulnerable server will cause the
      phpinfo() function call to be executed on the vulnerable server.

      An updated version of PHPXMLRPC can be downloaded from their official
      website, and all users are advised to upgrade immediately.


      A special thanks to Ed Dumbill, Giunta Gaetano, and all of the other
      people that helped get this fix out, and all of the people who helped
      us try and track down developers who were using this third party
      XMLRPC library.

      James Bercegay of the GulfTech Security Research Team