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Update `wp_kses_bad_protocol()` to recognize `:` on uri attributes, 

`wp_kses_bad_protocol()` makes sure to validate that uri attributes don’t contain invalid/or not allowed protocols. While this works fine in most cases, there’s a risk that by using the colon html5 named entity, one is able to bypass this function.

Props: xknown, nickdaugherty, peterwilsoncc.

Built from https://develop.svn.wordpress.org/trunk@46895


git-svn-id: http://core.svn.wordpress.org/trunk@46695 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
whyisjake 2019-12-12 17:55:05 +00:00
parent 80eab318eb
commit 84e4c8531a
2 changed files with 2 additions and 2 deletions
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2
wp-includes/kses.php
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@ -1665,7 +1665,7 @@ function wp_kses_html_error( $string ) {
*/
function wp_kses_bad_protocol_once( $string, $allowed_protocols, $count = 1 ) {
$string = preg_replace( '/(&#0*58(?![;0-9])|&#x0*3a(?![;a-f0-9]))/i', '$1;', $string );
$string2 = preg_split( '/:|&#0*58;|&#x0*3a;/i', $string, 2 );
$string2 = preg_split( '/:|&#0*58;|&#x0*3a;|:/i', $string, 2 );
if ( isset( $string2[1] ) && ! preg_match( '%/\?%', $string2[0] ) ) {
$string = trim( $string2[1] );
$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );

2
wp-includes/version.php
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@ -13,7 +13,7 @@
*
* @global string $wp_version
*/
$wp_version = '5.4-alpha-46894';
$wp_version = '5.4-alpha-46895';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.