Description
Lightbend Akka 2.5.x before 2.5.16 allows message disclosure and modification because of an RNG error. A random number generator is used in Akka Remoting for TLS (both classic and Artery Remoting). Akka allows configuration of custom random number generators. For historical reasons, Akka included the AES128CounterSecureRNG and AES256CounterSecureRNG random number generators. The implementations had a bug that caused the generated numbers to be repeated after only a few bytes. The custom RNG implementations were not configured by default but examples in the documentation showed (and therefore implicitly recommended) using the custom ones. This can be used by an attacker to compromise the communication if these random number generators are enabled in configuration. It would be possible to eavesdrop, replay, or modify the messages sent with Akka Remoting/Cluster.
Remediation
References
https://doc.akka.io/docs/akka/current/security/2018-08-29-aes-rng.html
Related Vulnerabilities
CVE-2020-2183 Vulnerability in maven package org.jenkins-ci.plugins:copyartifact
CVE-2020-2224 Vulnerability in maven package org.jenkins-ci.plugins:matrix-project
CVE-2016-3086 Vulnerability in maven package org.apache.hadoop:hadoop-common
CVE-2021-21692 Vulnerability in maven package org.jenkins-ci.main:jenkins-core
CVE-2020-2285 Vulnerability in maven package org.jenkins-ci.plugins:liquibase-runner