CVE-2020-17519 : Exploit Details and Defense Strategies
Learn about CVE-2020-17519, a vulnerability in Apache Flink 1.11.0 to 1.11.2 allowing unauthorized access to local files through the REST interface. Find mitigation steps and long-term security practices here.
Apache Flink directory traversal attack allows unauthorized access to local files through the REST interface.
Understanding CVE-2020-17519
Apache Flink 1.11.0 to 1.11.2 vulnerability enables attackers to read files on the JobManager's local filesystem.
What is CVE-2020-17519?
A security flaw in Apache Flink versions 1.11.0 to 1.11.2 permits attackers to access any file on the JobManager's local filesystem via the REST interface.
The Impact of CVE-2020-17519
- Attackers can read files restricted to the JobManager process
- Users are advised to upgrade to Flink 1.11.3 or 1.12.0
Technical Details of CVE-2020-17519
The vulnerability allows unauthorized file access through the JobManager's REST interface.
Vulnerability Description
The issue in Apache Flink versions 1.11.0 to 1.11.2 permits reading of local files accessible by the JobManager process.
Affected Systems and Versions
- Product: Apache Flink
- Vendor: Apache Software Foundation
- Versions: 1.11.0 to 1.11.2
Exploitation Mechanism
Attackers exploit the REST interface of the JobManager process to read files on the local filesystem.
Mitigation and Prevention
Immediate action and long-term security practices are crucial to prevent exploitation.
Immediate Steps to Take
- Upgrade to Flink 1.11.3 or 1.12.0
- Restrict network access to the JobManager
- Monitor for unauthorized file access
Long-Term Security Practices
- Regularly update Apache Flink to the latest version
- Implement network segmentation to limit access
Patching and Updates
- Apply security patches promptly
- Stay informed about security advisories from Apache Flink