Insecure Randomness Affecting org.apereo.cas:cas-server-support-oidc package, versions [,6.1.0-RC5)

  • Exploit Maturity

    Proof of concept

  • Attack Complexity


  • Confidentiality


  • Integrity


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  • snyk-id


  • published

    20 Sep 2019

  • disclosed

    20 Sep 2019

  • credit

    Jonathan Leitschuh

How to fix?

Upgrade org.apereo.cas:cas-server-support-oidc to version 6.1.0-RC5 or higher.


org.apereo.cas:cas-server-support-oidc is a package that allows allows CAS to act as an OpenId Connect Provider (OP).

Affected versions of this package are vulnerable to Insecure Randomness. A insecure source of randomness is used to generate all of its random values as it relies upon apache commons lang3 RandomStringUtils. This could allow an attacker to possibly generate their own unique Ticket ID due to insufficient randomness.