CVE-2019-10754 : Exploit Details and Defense Strategies

Apereo CAS versions prior to 6.1.0-RC5 have a security vulnerability related to predictable token and ID generation.

Understanding CVE-2019-10754

Insecure randomness in Apereo CAS exposes a security risk due to the predictability of generated tokens and IDs.

What is CVE-2019-10754?

Apereo CAS, before version 6.1.0-RC5, uses RandomStringUtils from apache commons-lang3 library for token and ID generation, leading to predictability.

The Impact of CVE-2019-10754

The vulnerability allows attackers to predict tokens and IDs, compromising the security of systems using Apereo CAS.

Technical Details of CVE-2019-10754

Apereo CAS vulnerability details and affected systems.

Vulnerability Description

Classes in Apereo CAS pre 6.1.0-RC5 utilize RandomStringUtils, making generated tokens and IDs predictable due to weak PRNG algorithm.

Affected Systems and Versions

Product: Apereo CAS
Vendor: n/a
Versions Affected: All versions before 6.1.0-RC5

Exploitation Mechanism

The vulnerability arises from the use of RandomStringUtils with a weak PRNG algorithm, enabling attackers to predict tokens and IDs.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2019-10754.

Immediate Steps to Take

Upgrade Apereo CAS to version 6.1.0-RC5 or later to address the vulnerability.
Monitor for any unusual activity related to token or ID generation.

Long-Term Security Practices

Implement strong cryptographic algorithms for token and ID generation.
Regularly review and update security practices to prevent similar vulnerabilities.

Patching and Updates

Apply patches and updates provided by Apereo CAS to fix the vulnerability.