Marcelo Vanzin commented on SPARK-20922:

You remediate it by upgrading to a version with the fix (see "Fix Versions").

> Unsafe deserialization in Spark LauncherConnection
> --------------------------------------------------
>                 Key: SPARK-20922
>                 URL: https://issues.apache.org/jira/browse/SPARK-20922
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Submit
>    Affects Versions: 2.1.1
>            Reporter: Aditya Sharad
>            Assignee: Marcelo Vanzin
>            Priority: Major
>              Labels: security
>             Fix For: 2.0.3, 2.1.2, 2.2.0, 2.3.0
>         Attachments: spark-deserialize-master.zip
> The {{run()}} method of the class 
> {{org.apache.spark.launcher.LauncherConnection}} performs unsafe 
> deserialization of data received by its socket. This makes Spark applications 
> launched programmatically using the {{SparkLauncher}} framework potentially 
> vulnerable to remote code execution by an attacker with access to any user 
> account on the local machine. Such an attacker could send a malicious 
> serialized Java object to multiple ports on the local machine, and if this 
> port matches the one (randomly) chosen by the Spark launcher, the malicious 
> object will be deserialized. By making use of gadget chains in code present 
> on the Spark application classpath, the deserialization process can lead to 
> RCE or privilege escalation.
> This vulnerability is identified by the “Unsafe deserialization” rule on 
> lgtm.com:
> https://lgtm.com/projects/g/apache/spark/snapshot/80fdc2c9d1693f5b3402a79ca4ec76f6e422ff13/files/launcher/src/main/java/org/apache/spark/launcher/LauncherConnection.java#V58
> Attached is a proof-of-concept exploit involving a simple 
> {{SparkLauncher}}-based application and a known gadget chain in the Apache 
> Commons Beanutils library referenced by Spark.
> See the readme file for demonstration instructions.

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