Check Point Advisories

Apache Flink Directory Traversal (CVE-2020-17518; CVE-2020-17519)

Check Point Reference: CPAI-2020-3204
Date Published: 17 Jan 2021
Severity: High
Last Updated: 17 Jan 2021
Industry Reference:CVE-2020-17518
Protection Provided by:

Security Gateway
R80, R77, R75

Who is Vulnerable? Apache Flink 1.5.1
Vulnerability Description A directory traversal vulnerability exists in Apache Flink. Successful exploitation of this vulnerability could allow an attacker to access arbitrary files on the affected system.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Apache Flink Directory Traversal (CVE-2020-17518) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Apache Server Protection Violation.
Attack Information:  Apache Flink Directory Traversal (CVE-2020-17518)

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