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Fix for URL sanitization that can lead to cross-site scripting (XSS) attacks.

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Props irsdl, sstoqnov, whyisjake.

git-svn-id: https://develop.svn.wordpress.org/trunk@45997 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Jonathan Desrosiers 2019-09-04 17:51:33 +00:00
parent b91c405069
commit cda102f72f
2 changed files with 10 additions and 1 deletions
src/wp-includes
kses.php
tests/phpunit/tests
kses.php

1
src/wp-includes/kses.php

@ -1664,6 +1664,7 @@ function wp_kses_html_error( $string ) {
* @return string Sanitized content.
*/
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 );
if ( isset( $string2[1] ) && ! preg_match( '%/\?%', $string2[0] ) ) {
$string = trim( $string2[1] );

10
tests/phpunit/tests/kses.php

@ -145,6 +145,8 @@ EOF;
'javascript&#0000058alert(1)//?:',
'feed:javascript:alert(1)',
'feed:javascript:feed:javascript:feed:javascript:alert(1)',
'javascript&#58alert(1)',
'javascript&#x3ax=1;alert(1)',
);
foreach ( $bad as $k => $x ) {
$result = wp_kses_bad_protocol( wp_kses_normalize_entities( $x ), wp_allowed_protocols() );
@ -165,8 +167,14 @@ EOF;
case 24:
$this->assertEquals( 'feed:alert(1)', $result );
break;
case 26:
$this->assertEquals( 'javascript&#58alert(1)', $result );
break;
case 27:
$this->assertEquals( 'javascript&#x3ax=1;alert(1)', $result );
break;
default:
$this->fail( "wp_kses_bad_protocol failed on $x. Result: $result" );
$this->fail( "wp_kses_bad_protocol failed on $k, $x. Result: $result" );
}
}
}