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I heard, that it would be possible to get man-in-the-middle-attacked this way, but the details are not clear to me.

Is it dangerous to use ports above 1024 for things like SSL? And why?

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I think you are mixing up two things:

  • A man-in-the-middle attack happens outside your computer in the network. All ports are in principle vulnerable against such attacks, unless you use a secure protocol on them
  • Only the root user can bind to the lower ports (up to 1023), but any user can bind to the other ports. Therefore, you usually don't want to use a higher port for things like ssl.

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