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Start learningUpgrade Flask-Security-Too
to version 3.4.5 or higher.
Affected versions of this package are vulnerable to Authentication Bypass such that it is possible for a malicious 3rd party to access the QRcode and therefore gain access to two-factor authentication codes.
Note:
The /tf-qrcode
endpoint is ONLY accessible while the user is initially setting up their device. Once setup is complete, there is no vulnerability.
Users can provide their own URL for fetching the QRcode by defining SECURITY_TWO_FACTOR_QRCODE_URL
and providing their own implementation (that presumably required a POST with CSRF protection). This would require changing the two-factor setup template as well.