Got root, thanks @ZaphodBB ! I would like to give some hints.
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When you try to decrypt the file, dont use the github tool, write a script. If you have the problem with one output file per password sort them by size.
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If you have access to this one service, google which configuration files the service has.
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You can get code execution by changing the configuration.
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You dont need a reverse shell. All files are in common places.