Typemill Authentication Bypass via Unlimited Login Attempts

Executive Summary

This vulnerability is in Typemill's login system. The login endpoint (POST /tm/login) has no rate-limiting or account lockout when CAPTCHA is disabled, which is the default setting. An attacker can send unlimited password-guessing attempts against any account, including administrators, without any throttling or restrictions.

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Detection Guidance

Monitor login attempts to the POST /tm/login endpoint. Check for unusually high failed login rates targeting any account, especially administrators. Review server logs for repeated password-guessing requests with no account lockouts or rate-limiting enforcement.

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Impact Analysis

An attacker could exploit this to gain unauthorized access to user accounts, including admin accounts, by guessing passwords. This could lead to data theft, unauthorized content changes, or complete system compromise. The lack of rate-limiting makes brute-force attacks highly feasible.

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Compliance Impact

This vulnerability could violate compliance requirements such as GDPR (data protection) or HIPAA (health information security) by allowing unauthorized access to sensitive data. Organizations using Typemill may fail to meet security controls requiring account lockout or rate-limiting to prevent brute-force attacks.

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Mitigation Strategies

• Enable rate-limiting on the /tm/login endpoint to restrict login attempts per IP or account.
• Implement account lockout after a set number of failed login attempts.
• Enable CAPTCHA for the login endpoint to prevent automated attacks.
• Review and apply any available Typemill security patches or updates.

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