Weakness (CWE)
CWE-640: Weak Password Recovery Mechanism for Forgotten Password
The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak.
How to prevent it (6 mitigations)
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Architecture and Design
Make sure that all input supplied by the user to the password recovery mechanism is thoroughly filtered and validated.
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Architecture and Design
Do not use standard weak security questions and use several security questions.
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Architecture and Design
Make sure that there is throttling on the number of incorrect answers to a security question. Disable the password recovery functionality after a certain (small) number of incorrect guesses.
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Architecture and Design
Require that the user properly answers the security question prior to resetting their password and sending the new password to the e-mail address of record.
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Architecture and Design
Never allow the user to control what e-mail address the new password will be sent to in the password recovery mechanism.
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Architecture and Design
Assign a new temporary password rather than revealing the original password.
Source: MITRE CWE-640
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