watchtowrlabs/juniper-rce_cve-2023-36844

502 after changing php files

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When I reproduced this vulnerability, I tried to change php files by using this command:

mkdir /root/writable
mount_unionfs /root/writable /.mount/packages/mnt/jweb-srxtvp-29090167/jail/html/core

but the server reponsed 502:

  | <!DOCTYPE html>
-- | --
  | <head>
  | <title>Bad Gateway</title>
  | <link rel="shortcut icon" href="data:image/x-icon;," type="image/x-icon">
  | </head>
  | <body>
  | <h2>Access Error: 502 -- Bad Gateway</h2>
  | <pre></pre>
  | </body>
  | </html>
  |  

So how to solve this problem?thanks