Okta Vulnerability in AD/LDAP Delegated Authentication Exposed


 

On October 30, 2024, Okta disclosed a critical security vulnerability in its AD/LDAP Delegated Authentication (DelAuth) system. This vulnerability exposed how caching processes, especially those using the hashing algorithm Bcrypt, can unintentionally bypass critical security requirements. The incident sheds light on the security risks associated with hashing in caching practices and emphasizes the need for developers to understand the limitations of popular hashing algorithms like Bcrypt.

Vulnerability Overview

The recently discovered vulnerability in Okta’s AD/LDAP Delegated Authentication (DelAuth) system resulted from using Bcrypt to hash combined values for cache keys: specifically, “userId + username + password.” This technique backfired, as Bcrypt has an input length limitation of 72 bytes. When input values surpass this threshold, Bcrypt automatically trims the excess, resulting in truncated keys and, in this case, a critical authentication bypass.

The vulnerability manifested only when usernames were 52 characters or longer. If this threshold was met, a user could bypass the password requirement by using a cached key from a previous session. The issue raises concerns about potential weaknesses in Okta’s security framework, which could impact Okta Verify, Okta Agent vulnerability, and other systems within the Okta suite.

Explore Bornsec’s Guide to Identity Management and Security Best Practices.

Bcrypt’s Input Length Limitation

Bcrypt, a trusted hashing algorithm, is well-known in cybersecurity for its effectiveness in securely hashing passwords. However, it has one notable limitation: an input length restriction of 72 bytes. Any input exceeding this limit will be silently truncated, causing potentially serious inconsistencies.

In Okta’s case, the cache keys were generated using “userId + username + password.” If the total length exceeded 72 bytes, Bcrypt would cut off extra characters without warning, generating the same cache key for different login attempts. This truncation allowed users to authenticate without re-entering their password in certain scenarios, presenting a significant security risk.

 

“Security isn’t just about choosing strong algorithms; it’s about knowing their limitations and applying them appropriately,”

Alex Johnson

 

Exploitation Conditions

This vulnerability surfaced under specific conditions, specifically with usernames exceeding 52 characters. When these conditions were met, the truncated cache key allowed users to bypass password requirements, enabling login with username-only authentication in some cases.

Understanding these requirements highlights the importance of carefully analyzing input data lengths when designing security features and avoiding assumptions about the hashing algorithm’s capabilities.

Key Takeaways for Developers

  1. Understand Algorithm Limitations:
    While Bcrypt is reliable for short, single-value strings like passwords, it’s unsuitable for long or combined strings. In cases where Bcrypt’s length limit might be exceeded, alternate algorithms like PBKDF2 or SHA-256 should be considered.
  2. Validate Input Lengths:
    Always validate input lengths before hashing, especially in caching contexts. Hashing algorithms that truncate without warning can lead to unpredictable vulnerabilities.
  3. Monitor Cache Authentication Patterns:
    Implement logging and monitoring to detect unusual patterns in cached authentication attempts. It’s essential to track any anomalies as these could indicate potential security threats.
  4. Consider Alternative Hashing Algorithms:
    For scenarios where input values are variable or may exceed 72 bytes, consider algorithms with more flexible input capacities, such as SHA-256, which can accommodate longer inputs without truncation.

Strengthen Your Organization’s Authentication with Bornsec Solutions

Impacted Products and Versions

The Okta AD/LDAP Delegated Authentication (DelAuth) system was specifically impacted. Okta promptly addressed the issue in its production environment on October 30, 2024, by implementing a patch that prevents the use of cached keys based on excessive input lengths.

For anyone relying on Okta Verify, Okta Classic, or other authentication methods within Okta’s environment, this incident highlights the need for ongoing monitoring and vulnerability management, as well as understanding the security measures Okta has in place to address these types of risks.

The Role of Okta in Cybersecurity

As a widely used identity and access management service, Okta plays a critical role in many organizations’ cybersecurity infrastructure. But like any security platform, it must continually evolve to mitigate emerging threats and protect user data.

This incident showcases why understanding Okta’s security limitations, such as potential Okta Agent vulnerabilities and caching risks, is essential for businesses relying on Okta for secure authentication and single sign-on (SSO).

Conclusion

The recent Okta vulnerability in AD/LDAP Delegated Authentication underscores the importance of using the correct hashing algorithms in caching processes. By choosing tools like PBKDF2 for variable input lengths, validating inputs, and closely monitoring authentication caches, developers can avoid similar risks.

This incident also serves as a reminder to regularly review and update security protocols to account for the nuances of each algorithm. For organizations, understanding Okta’s capabilities, limitations, and evolving security landscape is crucial to maintaining a secure environment and safeguarding user data.

 

Best practices in authentication and hashing methods.

 

FAQs

What is Okta in cybersecurity?
Okta provides a range of identity and access management solutions, enabling secure authentication and authorization for businesses and individual users. Its tools, including Okta Verify and Okta Classic, are widely trusted for managing access to sensitive applications and services.

Difference between SAML and Okta
While SAML (Security Assertion Markup Language) is a standard for web-based authentication, Okta integrates SAML to offer secure SSO (single sign-on) capabilities. Okta simplifies SSO by using SAML protocols, making it easier for organizations to manage user authentication across multiple platforms.

Difference between SSO and Okta
Okta is a provider of SSO services. SSO refers to the ability to authenticate users once for multiple applications, and Okta specializes in delivering this capability securely.

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