CVE-2023-22946: Apache Spark proxy-user privilege escalation from malicious configuration class

["Sean R. Owen" <sr...@apache.org>]

Description:

In Apache Spark versions prior to 3.4.0, applications using spark-submit can specify a 'proxy-user' to run as, limiting privileges. The application can execute code with the privileges of the submitting user, however, by providing malicious configuration-related classes on the classpath. This affects architectures relying on proxy-user, for example those using Apache Livy to manage submitted applications.

This issue is being tracked as SPARK-41958 

Work Arounds:

Update to Apache Spark 3.4.0 or later, and ensure that spark.submit.proxyUser.allowCustomClasspathInClusterMode is set to its default of "false", and is not overridden by submitted applications.

Credit:

Hideyuki Furue (finder)
Yi Wu (Databricks) (remediation developer)

References:

https://spark.apache.org/
https://www.cve.org/CVERecord?id=CVE-2023-22946
https://issues.apache.org/jira/browse/SPARK-41958


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