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I'm having a hard time finding a good definition for a Reverse WWW Shell through regular Google searching.

So far, I've gathered:

Reverse shell is a technique of establishing a remote connection (shell prompt) to a host allowing only outgoing connections.

Am I close?

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  • Do you have a source where you read that? The author possibly means a reverse shell that uses web technologies (e.g. PHP).
    – Arminius
    Commented Jan 5, 2018 at 19:11
  • @Arminius It was in a computer science class, the teacher said it
    – Kellen Stuart
    Commented Jan 5, 2018 at 19:15
  • The context in which it was said might have indicated what was meant by it, but likely a reverse shell in a web scripting language, perhaps executed via a web flaw such as remote file include. Or simply a reverse shell connnecting out on port 80 or 443.
    – wireghoul
    Commented Jan 6, 2018 at 5:39

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A reverse shell is a type of shell in which the target machine communicates back to the attacking machine. The attacking machine has a listener port on which it receives the connection, which by using, code or command execution is achieved.

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That being said a reverse shell could be done in many languages. What your computer science professor is most likely talking about is the ability to upload a file to a web-server and then remotely execute it like a CGI script ... which in turn would give you shell access to the server.

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