Thanks to Trixter#0001 on Discord for this security report.
There was a two-factor authentication bypass present in all previous versions of Pterodactyl that would allow a user to login without providing a token by going through the password reset process. A person would still have to have access to the targeted account's email, but if they did manage to get a password reset link they would be able to reset the account password and then proceede to login without a token being required.
This logic has since been changed to check if 2FA is enabled on an account, and if so they will NOT be logged in when their password is changed. This will force them to continue through the normal login pathway where a token will be needed.
Overall the impact of this issue is minor, but I am still addressing it and disclosing the mechanism behind it.
This bug was reported to us by a user (@Ferry#1704) on Discord on
Monday, November 7th, 2016.
It was disclosed that it was possible to bypass the 2FA checkpoint by
clicking outside of the modal which would prompt the modal to close,
but not submit the form. The user could then press the login button
which would trigger an error. Due to this error being triggered the
authentication attempt was not cancelled. On the next page load the
application recognized the user as logged in and continued on to the
panel.
At no time was it possible to login without using the correct email
address and password.
As a result of this bug we have re-factored the Authentication code for
logins to address the persistent session. Previously accounts were
manually logged back out on 2FA failure. However, as this bug
demonstrated, causing a fatal error in the code would prevent the
logout code from firing, thus preserving their session state.
This commit modifies the code to use a non-persistent login to handle
2FA checking. In order for the session to be saved the application must
complete all portions of the login without any errors, at which point
the user is persistently authenticated using Auth::login().
This resolves the ability to cause an exception and bypass 2FA
verification.
