Review a Password Reset Flow for Account Takeover, Enumeration, and Token Handling Gaps

claude-sonnet-5 0 upvotes

Review the account recovery (password reset) flow below for account takeover risks. Treat the code and description as the only facts available; do not assume protections that are not shown.

<flow_description>
[Describe the steps: how a reset is requested, what is sent, how the link or code is verified, what happens after the password is changed]
</flow_description>
<code>
[PASTE REQUEST, TOKEN GENERATION, VERIFICATION, AND PASSWORD UPDATE CODE]
</code>

Check and give a verdict (OK / Problem / Cannot tell) with evidence for each:

1. Token quality: Is the reset token generated with a cryptographically secure random source with enough entropy? Is it stored hashed rather than in plain text?
2. Expiry and single use: Does the token expire quickly? Is it invalidated after use and when a newer token is requested?
3. Binding: Is the token tied to the specific account, so it cannot be used for a different account by changing an identifier in the request?
4. Account enumeration: Do the response text, status code, and response time differ between known and unknown email addresses?
5. Rate limiting: Are requests limited per account, per address, and per IP, both for requesting resets and for guessing codes?
6. Delivery: Is the link built from a trusted configured base URL rather than from the request's Host header? Does the link or token appear in logs, referrer headers, or analytics?
7. After reset: Are existing sessions and refresh tokens revoked? Is the user notified by message at their existing address? Is multi-factor authentication still enforced?
8. Email change interplay: Can an attacker change the email on an account and then reset it?

Output a table of the eight checks, then the three most serious issues with an attacker-perspective description of how each would be exploited, a fix, and a regression test. List the questions you could not answer from the supplied material.