QID 730426

Date Published: 2022-04-07

QID 730426: Apache Flink Arbitrary File Read Vulnerability

Apache Flink is an open-source, unified stream-processing and batch-processing framework developed by the Apache Software Foundation. The core of Apache Flink is a distributed streaming data-flow engine written in Java and Scala. Flink executes arbitrary dataflow programs in a data-parallel and pipelined (hence task parallel) manner.

CVE-2020-17519: A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem of the JobManager through the REST interface of the JobManager process. Access is restricted to files accessible by the JobManager process.

Affected Versions:
Apache Flink versions from 1.11.0 prior to 1.11.3

QID Detection Logic (Unauthenticated):
This QID sends a GET request to grab the value of 'flink-version' from the source code, and checks if the version is vulnerable or not.

Successful exploitation of this vulnerability may allow an unauthenticated remote attacker to read arbitrary file on the system using directory traversal attack.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution
    Vendor has released patch and customers are advised to update to Apache Flink 1.11.3, 1.12.0 or later. For more information please refer to Apache Flink Security Advisory
    Vendor References

    CVEs related to QID 730426

    CVE-2020-17519 |
    Software Advisories
    Advisory ID Software Component Link
    Apache Flink Advisory URL Logo lists.apache.org/thread/l5r1k1f2s4qjjyl1p6wt6sqzcwomkfmk
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