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False positive for "Possible unprotected redirect" #1117

obfuscoder opened this Issue Nov 10, 2017 · 1 comment


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3 participants

obfuscoder commented Nov 10, 2017

Our rails app initializes sessions via backend and stores the session token in the database. This session token is then used by the client to initiate the frontend by calling


We are using something like this to lookup whether we have a session with this token:

session = Session.find_by_token params[:session]
if session
  # proceed with extracting user context from session and more and redirect to the last path the user was shown to
  redirect_to session.user.current_path
  redirect_to expired_or_invalid_session_path

brakeman reports this:

Confidence: High
Category: Redirect
Check: Redirect
Message: Possible unprotected redirect
Code: redirect_to(Session.find_by_token(params[:session]).user.current_path)
File: ...rb
Line: ...

This seems to be a false positive. The parameter is checked by querying the database for finding an object with that session token. The tokens are randomly generated strings with high entropy. I would not expect brakeman to report this as the indirect lookup via DB is performed.

@presidentbeef presidentbeef added this to the 4.0.2 milestone Nov 17, 2017


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codebycliff commented Feb 8, 2018

I believe I am getting a false positive too. Here is the warning I'm getting:

Confidence: High
Category: Redirect
Check: Redirect
Message: Possible unprotected redirect
Code: redirect_to(TeamUser.find(params[:id]).team.challenge, :notice => ("You have been added to team #{TeamUser.find(params[:id])}"))
File: app/controllers/team_users_controller.rb
Line: 9

If this isn't a false positive and there is something I am doing wrong, please let me know.

presidentbeef added a commit that referenced this issue Feb 21, 2018

Repository owner locked and limited conversation to collaborators May 9, 2018

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