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Mitigation Strategies Analysis for symfonycasts/reset-password-bundle

Mitigation Strategy: Short Token Lifetimes

  • Description:

    1. Review bundle configuration: Check the config/packages/reset_password.yaml (or equivalent configuration file) for the lifetime setting of the symfonycasts_reset_password bundle.
    2. Set a short lifetime: Adjust the lifetime value to the shortest practical duration. Consider values like 3600 (1 hour), 1800 (30 minutes), or even shorter, depending on your user base and security requirements. This is a direct configuration of the bundle.
    3. Update user documentation: Clearly inform users about the token expiration time in your application's help documentation, FAQs, and within the password reset email itself.
    4. Test expiration: Manually test the token expiration functionality by requesting a reset, waiting longer than the configured lifetime, and then attempting to use the token. Verify that it is rejected.

  • Threats Mitigated:

    • Token Brute-Forcing (Medium Severity): Significantly reduces the window of opportunity for an attacker to successfully brute-force a token.
    • Token Reuse (if intercepted) (Medium Severity): Limits the time an intercepted token remains valid.

  • Impact:

    • Token Brute-Forcing: Risk reduced from Medium to Low.
    • Token Reuse: Risk reduced from Medium to Low.

  • Currently Implemented:

    • Implemented in config/packages/reset_password.yaml. The current lifetime is set to 3600 seconds (1 hour).

  • Missing Implementation:

    • None. The current implementation is considered adequate, but could be reviewed periodically.

Mitigation Strategy: One-Time Use Tokens

  • Description:

    1. Verify bundle behavior: The symfonycasts/reset-password-bundle should invalidate tokens after a successful password reset by default. This is a core feature of the bundle. However, verify this behavior through testing and code review. Don't solely rely on documentation.
    2. Check token invalidation logic (within the bundle): While you shouldn't modify the bundle's internal code directly, you can and should review the bundle's source code (on GitHub or in your vendor directory) to understand how it handles token invalidation. Look for the database interaction where the token is marked as used or deleted. This is about understanding, not modifying, the bundle's core functionality.
    3. Test thoroughly: Request a password reset, successfully change the password, and then attempt to use the same token again. Verify that it is rejected. This confirms the bundle's expected behavior.

  • Threats Mitigated:

    • Replay Attacks (High Severity): Prevents an attacker from using a valid token multiple times.

  • Impact:

    • Replay Attacks: Risk reduced from High to Low.

  • Currently Implemented:

    • Implemented (by default behavior of the bundle). Verification through testing is crucial.

  • Missing Implementation:

    • None, assuming testing confirms the expected behavior. The key here is verification that the bundle is behaving as designed.

Mitigation Strategy: Ensure Strong Randomness (Relating to Bundle's Token Generation)

  • Description:

    1. Verify Bundle's Dependency: The symfonycasts/reset-password-bundle relies on PHP's random_bytes() function for generating cryptographically secure random tokens. This function, in turn, depends on the underlying operating system's secure random number generator.
    2. Check System Randomness Source: On Linux systems, ensure that /dev/urandom is available and accessible to the PHP process. This is the preferred source of randomness for random_bytes(). While not a direct bundle configuration, it directly impacts the security of the tokens generated by the bundle.
    3. Update System Libraries: Regularly update your operating system and PHP to the latest versions to benefit from any security patches and improvements in random number generation. This ensures that random_bytes() is using the most secure available methods.
    4. Monitor System Entropy (Linux): On Linux, you can monitor the available entropy using cat /proc/sys/kernel/random/entropy_avail. Low entropy can lead to weaker random number generation. Consider using tools like rngd to replenish entropy if needed. This is a proactive measure to ensure the quality of randomness used by the bundle.

  • Threats Mitigated:

    • Token Prediction (High Severity): If the underlying random number generator is weak (due to system misconfiguration or low entropy), the reset tokens generated by the bundle could become predictable.

  • Impact:

    • Token Prediction: Risk reduced from High to Low.

  • Currently Implemented:

    • Partially Implemented. The server is running an up-to-date Linux distribution and PHP version. However, proactive monitoring of system entropy is not in place.

  • Missing Implementation:

    • Implement monitoring of system entropy (e.g., using a monitoring tool or a custom script) and configure alerts for low entropy levels. This ensures the environment in which the bundle operates is providing strong randomness.