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Better validation of the URL used in HTTP redirects. 

Merges [36444] to the 4.4 branch.
Built from https://develop.svn.wordpress.org/branches/4.4@36447


git-svn-id: http://core.svn.wordpress.org/branches/4.4@36414 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Dominik Schilling 2016-02-02 16:59:28 +00:00
parent 59523c0dba
commit 16414c4f90
1 changed files with 12 additions and 3 deletions
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15
wp-includes/pluggable.php
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@ -1333,7 +1333,8 @@ function wp_validate_redirect($location, $default = '') {
// In php 5 parse_url may fail if the URL query part contains http://, bug #38143
$test = ( $cut = strpos($location, '?') ) ? substr( $location, 0, $cut ) : $location;
$lp = parse_url($test);
// @-operator is used to prevent possible warnings in PHP < 5.3.3.
$lp = @parse_url($test);
// Give up if malformed URL
if ( false === $lp )
@ -1343,9 +1344,17 @@ function wp_validate_redirect($location, $default = '') {
if ( isset($lp['scheme']) && !('http' == $lp['scheme'] || 'https' == $lp['scheme']) )
return $default;
// Reject if scheme is set but host is not. This catches urls like https:host.com for which parse_url does not set the host field.
if ( isset($lp['scheme']) && !isset($lp['host']) )
// Reject if certain components are set but host is not. This catches urls like https:host.com for which parse_url does not set the host field.
if ( ! isset( $lp['host'] ) && ( isset( $lp['scheme'] ) || isset( $lp['user'] ) || isset( $lp['pass'] ) || isset( $lp['port'] ) ) ) {
return $default;
}
// Reject malformed components parse_url() can return on odd inputs
foreach ( array( 'user', 'pass', 'host' ) as $component ) {
if ( isset( $lp[ $component ] ) && strpbrk( $lp[ $component ], ':/?#@' ) ) {
return $default;
}
}
$wpp = parse_url(home_url());