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Updated on 2024-11-10

Apache Flink Arbitrary JAR Package Upload Vulnerability Exploitation and Prevention Strategy Analysis

Apache Flink Arbitrary JAR Package Upload Vulnerability and Prevention Strategy

introductory

Apache Flink is a popular open source stream processing framework that is widely used in big data processing due to its powerful stream processing capabilities. However, a serious security vulnerability was recently discovered in Apache Flink version 1.9.1, which allows an attacker to upload and execute arbitrary JAR packages. In this article, we will discuss the cause of the vulnerability, how to exploit it, and how to effectively prevent it.

Apache Flink Arbitrary JAR Package Upload Vulnerability Overview

The vulnerability primarily affects misconfigured Apache Flink clusters and allows an attacker to upload malicious JAR packages via a web interface to execute remote code.

Vulnerability Causes Analysis

The vulnerability is caused mainly because the JobManager component of Apache Flink lacks the necessary security checks when processing externally submitted JAR packages, which allows unauthorized users to upload and execute JAR packages.

Vulnerability Impact Scope

Apache Flink version 1.9.1 and earlier.

Vulnerability Exploitation Methods

Environment Setup

  • Install the Java environment.
  • Download and extract Apache Flink 1.9.1.

Vulnerability Recovery Steps

  • utilizationmsfvenom Create a malicious JAR file containing Meterpreter.
  • Malicious JAR files are uploaded through Apache Flink's web interface.
  • Submit a new Job and specify the uploaded JAR file to trigger remote code execution.

real-life example

  • The attacker uploads a file named malicious JAR file.
  • Use Metasploit to set up a listen and wait for the bounce shell.
  • Execute the uploaded JAR file and successfully obtain a reverse connection to the server.

Preventive Strategies

1. Immediate update

Upgrade to the latest version of Apache Flink as soon as possible to fix known security vulnerabilities.

2. Access control

  • Restrict access to the Flink web interface to ensure that only authorized users can operate it.
  • Encrypted transmission using HTTPS protocol to prevent man-in-the-middle attacks.

3. Configuration review

  • Review the Flink configuration file and close unnecessary services and ports.
  • Ensure that the configuration of the Flink cluster does not contain security vulnerabilities.

4. Network segregation

Deploy the Flink cluster in a protected network area to avoid direct exposure to the public network.

5. Log monitoring

  • Enable access and operation logging to monitor abnormal behavior.
  • Log files are checked regularly to detect suspicious activity in a timely manner.

concluding remarks

The Arbitrary JAR Package Upload Vulnerability in Apache Flink is a serious security risk that requires immediate steps to fix. The analysis and prevention strategies provided in this article can help administrators and developers protect their Flink clusters from this vulnerability and ensure the security of big data environments.

Attention: The cases and methods provided in this article are for teaching purposes only, and the actual operation should ensure compliance with relevant laws and regulations, and should not be used to illegally invade or attack other people's systems.

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