[KVE-2020-0104,105,106]그누보드XSS취약점 수정

lib/common.lib.php

@@ -3035,7 +3035,30 @@ function clean_xss_tags($str, $check_entities=0)
 // XSS 어트리뷰트 태그 제거
 function clean_xss_attributes($str)
 {
-    $str = preg_replace('#(onabort|onactivate|onafterprint|onafterupdate|onbeforeactivate|onbeforecopy|onbeforecut|onbeforedeactivate|onbeforeeditfocus|onbeforepaste|onbeforeprint|onbeforeunload|onbeforeupdate|onblur|onbounce|oncellchange|onchange|onclick|oncontextmenu|oncontrolselect|oncopy|oncut|ondataavaible|ondatasetchanged|ondatasetcomplete|ondblclick|ondeactivate|ondrag|ondragdrop|ondragend|ondragenter|ondragleave|ondragover|ondragstart|ondrop|onerror|onerrorupdate|onfilterupdate|onfinish|onfocus|onfocusin|onfocusout|onhelp|onkeydown|onkeypress|onkeyup|onlayoutcomplete|onload|onlosecapture|onmousedown|onmouseenter|onmouseleave|onmousemove|onmoveout|onmouseover|onmouseup|onmousewheel|onmove|onmoveend|onmovestart|onpaste|onpropertychange|onreadystatechange|onreset|onresize|onresizeend|onresizestart|onrowexit|onrowsdelete|onrowsinserted|onscroll|onselect|onselectionchange|onselectstart|onstart|onstop|onsubmit|onunload)\\s*=\\s*\\\?".*?"#is', '', $str);
+    $xss_attributes_string = 'onAbort|onActivate|onAttribute|onAfterPrint|onAfterScriptExecute|onAfterUpdate|onAnimationCancel|onAnimationEnd|onAnimationIteration|onAnimationStart|onAriaRequest|onAutoComplete|onAutoCompleteError|onAuxClick|onBeforeActivate|onBeforeCopy|onBeforeCut|onBeforeDeactivate|onBeforeEditFocus|onBeforePaste|onBeforePrint|onBeforeScriptExecute|onBeforeUnload|onBeforeUpdate|onBegin|onBlur|onBounce|onCancel|onCanPlay|onCanPlayThrough|onCellChange|onChange|onClick|onClose|onCommand|onCompassNeedsCalibration|onContextMenu|onControlSelect|onCopy|onCueChange|onCut|onDataAvailable|onDataSetChanged|onDataSetComplete|onDblClick|onDeactivate|onDeviceLight|onDeviceMotion|onDeviceOrientation|onDeviceProximity|onDrag|onDragDrop|onDragEnd|onDragEnter|onDragLeave|onDragOver|onDragStart|onDrop|onDurationChange|onEmptied|onEnd|onEnded|onError|onErrorUpdate|onExit|onFilterChange|onFinish|onFocus|onFocusIn|onFocusOut|onFormChange|onFormInput|onFullScreenChange|onFullScreenError|onGotPointerCapture|onHashChange|onHelp|onInput|onInvalid|onKeyDown|onKeyPress|onKeyUp|onLanguageChange|onLayoutComplete|onLoad|onLoadedData|onLoadedMetaData|onLoadStart|onLoseCapture|onLostPointerCapture|onMediaComplete|onMediaError|onMessage|onMouseDown|onMouseEnter|onMouseLeave|onMouseMove|onMouseOut|onMouseOver|onMouseUp|onMouseWheel|onMove|onMoveEnd|onMoveStart|onMozFullScreenChange|onMozFullScreenError|onMozPointerLockChange|onMozPointerLockError|onMsContentZoom|onMsFullScreenChange|onMsFullScreenError|onMsGestureChange|onMsGestureDoubleTap|onMsGestureEnd|onMsGestureHold|onMsGestureStart|onMsGestureTap|onMsGotPointerCapture|onMsInertiaStart|onMsLostPointerCapture|onMsManipulationStateChanged|onMsPointerCancel|onMsPointerDown|onMsPointerEnter|onMsPointerLeave|onMsPointerMove|onMsPointerOut|onMsPointerOver|onMsPointerUp|onMsSiteModeJumpListItemRemoved|onMsThumbnailClick|onOffline|onOnline|onOutOfSync|onPage|onPageHide|onPageShow|onPaste|onPause|onPlay|onPlaying|onPointerCancel|onPointerDown|onPointerEnter|onPointerLeave|onPointerLockChange|onPointerLockError|onPointerMove|onPointerOut|onPointerOver|onPointerUp|onPopState|onProgress|onPropertyChange|onqt_error|onRateChange|onReadyStateChange|onReceived|onRepeat|onReset|onResize|onResizeEnd|onResizeStart|onResume|onReverse|onRowDelete|onRowEnter|onRowExit|onRowInserted|onRowsDelete|onRowsEnter|onRowsExit|onRowsInserted|onScroll|onSearch|onSeek|onSeeked|onSeeking|onSelect|onSelectionChange|onSelectStart|onStalled|onStorage|onStorageCommit|onStart|onStop|onShow|onSyncRestored|onSubmit|onSuspend|onSynchRestored|onTimeError|onTimeUpdate|onTimer|onTrackChange|onTransitionEnd|onToggle|onTouchCancel|onTouchEnd|onTouchLeave|onTouchMove|onTouchStart|onTransitionCancel|onTransitionEnd|onUnload|onURLFlip|onUserProximity|onVolumeChange|onWaiting|onWebKitAnimationEnd|onWebKitAnimationIteration|onWebKitAnimationStart|onWebKitFullScreenChange|onWebKitFullScreenError|onWebKitTransitionEnd|onWheel';
+    
+    do {
+        $count = $temp_count = 0;
+
+        $str = preg_replace(
+            '/(.*)(?:' . $xss_attributes_string . ')(?:\s*=\s*)(?:\'(?:.*?)\'|"(?:.*?)")(.*)/ius',
+            '$1-$2-$3-$4',
+            $str,
+            -1,
+            $temp_count
+        );
+        $count += $temp_count;
+
+        $str = preg_replace(
+            '/(.*)(?:' . $xss_attributes_string . ')\s*=\s*(?:[^\s>]*)(.*)/ius',
+            '$1$2',
+            $str,
+            -1,
+            $temp_count
+        );
+        $count += $temp_count;
+
+    } while ($count);
 
     return $str;
 }