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Ignore entities in XML-RPC requests.

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Merges [29404] to the 3.9 branch.

props mdawaffe, nacin.

Built from https://develop.svn.wordpress.org/branches/3.9@29405


git-svn-id: http://core.svn.wordpress.org/branches/3.9@29183 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Andrew Nacin 2014-08-06 17:40:17 +00:00
parent 9173953c3e
commit 824ca5b030
1 changed files with 29 additions and 3 deletions
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32
wp-includes/class-IXR.php
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@ -203,11 +203,37 @@ class IXR_Message
{
// first remove the XML declaration
// merged from WP #10698 - this method avoids the RAM usage of preg_replace on very large messages
$header = preg_replace( '/<\?xml.*?\?'.'>/', '', substr($this->message, 0, 100), 1);
$this->message = substr_replace($this->message, $header, 0, 100);
if (trim($this->message) == '') {
$header = preg_replace( '/<\?xml.*?\?'.'>/s', '', substr( $this->message, 0, 100 ), 1 );
$this->message = trim( substr_replace( $this->message, $header, 0, 100 ) );
if ( '' == $this->message ) {
return false;
}
// Then remove the DOCTYPE
$header = preg_replace( '/^<!DOCTYPE[^>]*+>/i', '', substr( $this->message, 0, 200 ), 1 );
$this->message = trim( substr_replace( $this->message, $header, 0, 200 ) );
if ( '' == $this->message ) {
return false;
}
// Check that the root tag is valid
$root_tag = substr( $this->message, 0, strcspn( substr( $this->message, 0, 20 ), "> \t\r\n" ) );
if ( '<!DOCTYPE' === strtoupper( $root_tag ) ) {
return false;
}
if ( ! in_array( $root_tag, array( '<methodCall', '<methodResponse', '<fault' ) ) ) {
return false;
}
// Bail if there are too many elements to parse
$element_limit = 30000;
if ( function_exists( 'apply_filters' ) ) {
$element_limit = apply_filters( 'xmlrpc_element_limit', $element_limit );
}
if ( $element_limit && 2 * $element_limit < substr_count( $this->message, '<' ) ) {
return false;
}
$this->_parser = xml_parser_create();
// Set XML parser to take the case of tags in to account
xml_parser_set_option($this->_parser, XML_OPTION_CASE_FOLDING, false);