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What are the dangers involved regarding security in sharing a screen session with other users?

I plan to follow this guide:

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up vote 2 down vote accepted

There's two main security risks there

  • Making screen setuid root. This means that anyone who runs it can run it with root privlidges.
  • The 'guest' user can run commands as the other user.

Screen is wonderful, but I'd avoid sharing it.

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