Kimai is a widely used open-source time-tracking software that is popular among freelancers, small businesses, and large organizations. It is designed to track work time, generate invoices, and create insightful reports, enhancing productivity and accuracy in project management tasks. Kimai can be deployed on various platforms using Docker containers, which allows for easy integration with existing systems. It supports multiple users with role-based access control, providing flexibility for teams of different sizes. The software is appreciated for its comprehensive features that support financial transparency and compliance. Overall, Kimai is a reliable choice for those looking to streamline their time-tracking and billing processes.
The hard-coded secret vulnerability in Kimai affects versions up to 2.57.0 due to the default APP_SECRET used in Docker images. This secret is expected to be unique per installation but is hardcoded in these versions, posing a severe security risk. The vulnerability resides in the way the default secret is used for hashing mechanisms related to login and authentication processes. An attacker can exploit this by forging authentication tokens, thus bypassing security controls without needing each user's password. Such vulnerabilities are critical as they provide unauthorized access to sensitive data, including administrative credentials, with ease. Effective mitigations include updating to a later version or setting unique secrets manually upon installation.
Technically, the vulnerability exploits the default secret used in the Symfony SignatureHasher for HMAC signing of login links and remember-me cookies. Attackers who know this default secret can perform unauthorized account takeovers by crafting malicious login links. The affected endpoint `/en/auth/link/check` is susceptible, where an attacker can manipulate parameters such as user, expiry, and hash to gain access. The vulnerability is in the authentication bypass category, allowing attackers complete control over user sessions without a password. Proper parameterization and secret management can mitigate such risks, ensuring that hardcoded secrets are never used in production environments.
Exploiting this vulnerability can lead to full account takeovers by unauthenticated attackers, granting them unauthorized access to user data. They can impersonate any user, including super-admins, leading to severe data breaches and privacy issues. Enterprises using Kimai could face reputational damage, financial loss, and legal implications due to unauthorized data access and potential compliance failures. Maintaining robust security posture through timely updates and configurations, along with auditing and monitoring practices, is crucial to prevent exploiting such vulnerabilities. Data integrity, confidentiality, and availability remain at risk until mitigations are implemented.
REFERENCES
- Upgrade to Kimai version 2.58.0 or later, which addresses this vulnerability by generating a unique APP_SECRET during initial setup.
- Manually set a secure and unique APP_SECRET in your .env.local file for existing installations.
- Audit existing credentials and tokens and invalidate those that may have been compromised.
- Implement security practices that involve rotating secret keys regularly to mitigate potential threats.
- Conduct regular vulnerability assessments and penetration tests to identify and address potential security gaps.
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