Changeset 41471

Timestamp:

09/19/2017 02:54:03 PM (7 years ago)

Author:

aaroncampbell

Message:

Database: Hardening for wpdb::prepare()

Previously if you passed an array of values for placeholders, additional values could be passed as well. Now additional values will be ignored.

Merges [41470] to 4.8 branch.

Location:

branches/4.8

Files:

• . (modified) (1 prop)
• src/wp-includes/wp-db.php (modified) (1 diff)
• tests/phpunit/tests/db.php (modified) (1 diff)

branches/4.8/src/wp-includes/wp-db.php

@@ -1300 +1300 @@
         $args = func_get_args();
         array_shift( $args );
+
         // If args were passed as an array (as in vsprintf), move them up
-        if ( isset( $args[0] ) && is_array($args[0]) )
+        if ( is_array( $args[0] ) && count( $args ) == 1 ) {
             $args = $args[0];
+        }
+
+        foreach ( $args as $arg ) {
+            if ( ! is_scalar( $arg ) ) {
+                _doing_it_wrong( 'wpdb::prepare', sprintf( 'Unsupported value type (%s).', gettype( $arg ) ), '4.8.2' );
+            }
+        }
+
         $query = str_replace( "'%s'", '%s', $query ); // in case someone mistakenly already singlequoted it
         $query = str_replace( '"%s"', '%s', $query ); // doublequote unquoting

branches/4.8/tests/phpunit/tests/db.php

@@ -355 +355 @@
     }
 
+    function test_prepare_sprintf() {
+        global $wpdb;
+
+        $prepared = $wpdb->prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s", 1, "admin" );
+        $this->assertEquals( "SELECT * FROM $wpdb->users WHERE id = 1 AND user_login = 'admin'", $prepared );
+    }
+
+    /**
+     * @expectedIncorrectUsage wpdb::prepare
+     */
+    function test_prepare_sprintf_invalid_args() {
+        global $wpdb;
+
+        $prepared = @$wpdb->prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s", 1, array( "admin" ) );
+        $this->assertEquals( "SELECT * FROM $wpdb->users WHERE id = 1 AND user_login = ''", $prepared );
+
+        $prepared = @$wpdb->prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s", array( 1 ), "admin" );
+        $this->assertEquals( "SELECT * FROM $wpdb->users WHERE id = 0 AND user_login = 'admin'", $prepared );
+    }
+
+        function test_prepare_vsprintf() {
+                global $wpdb;
+
+        $prepared = $wpdb->prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s", array( 1, "admin" ) );
+        $this->assertEquals( "SELECT * FROM $wpdb->users WHERE id = 1 AND user_login = 'admin'", $prepared );
+    }
+
+    /**
+     * @expectedIncorrectUsage wpdb::prepare
+     */
+    function test_prepare_vsprintf_invalid_args() {
+        global $wpdb;
+
+        $prepared = @$wpdb->prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s", array( 1, array( "admin" ) ) );
+        $this->assertEquals( "SELECT * FROM $wpdb->users WHERE id = 1 AND user_login = ''", $prepared );
+
+        $prepared = @$wpdb->prepare( "SELECT * FROM $wpdb->users WHERE id = %d AND user_login = %s", array( array( 1 ), "admin" ) );
+        $this->assertEquals( "SELECT * FROM $wpdb->users WHERE id = 0 AND user_login = 'admin'", $prepared );
+        }
+
     function test_db_version() {
         global $wpdb;