CVE-2021-39239 : Exploit Details and Defense Strategies
Learn about CVE-2021-39239, a high-risk vulnerability in Apache Jena allowing XXE attacks. Find out the impact, affected versions, and mitigation steps.
CVE-2021-39239, a vulnerability in XML processing in Apache Jena, allows for the execution of XML External Entities (XXE) up to version 4.1.0.
Understanding CVE-2021-39239
Apache Jena is affected by an XXE vulnerability that can lead to disclosures of local file contents.
What is CVE-2021-39239?
The CVE-2021-39239 vulnerability in Apache Jena versions up to 4.1.0 enables attackers to execute XML External Entities (XXE), potentially exposing local files to remote servers.
The Impact of CVE-2021-39239
The vulnerability is considered high risk due to the ability of attackers to execute XXE attacks in affected versions of Apache Jena.
Technical Details of CVE-2021-39239
This section provides in-depth technical information about the vulnerability.
Vulnerability Description
The vulnerability allows attackers to execute XXE attacks on Apache Jena versions up to 4.1.0, potentially exposing local file contents.
Affected Systems and Versions
- Product: Apache Jena
- Vendor: Apache Software Foundation
- Affected Versions: Up to 4.1.0
Exploitation Mechanism
The vulnerability may be exploited by executing malicious XML External Entities (XXE) within the affected Apache Jena software.
Mitigation and Prevention
It is crucial to take immediate steps to mitigate the CVE-2021-39239 vulnerability.
Immediate Steps to Take
- Upgrade to Apache Jena 4.2.0 or newer to prevent exploitation of the XXE vulnerability.
Long-Term Security Practices
- Regularly update software to the latest versions.
- Implement secure coding practices to mitigate similar vulnerabilities.
Patching and Updates
- Ensure timely installation of patches and updates provided by Apache Software Foundation to address the CVE-2021-39239 vulnerability.