CVE-2019-0211 Explained : Impact and Mitigation
Learn about CVE-2019-0211 affecting Apache HTTP Server versions 2.4.17 to 2.4.38. Understand the privilege escalation vulnerability, its impact, and mitigation steps.
CVE-2019-0211, published on April 8, 2019, affects Apache HTTP Server versions 2.4.17 to 2.4.38. The vulnerability allows code executed in child processes or threads with lower privileges to run arbitrary code using the parent process's privileges by manipulating the scoreboard.
Understanding CVE-2019-0211
This CVE impacts Apache HTTP Server versions 2.4.17 to 2.4.38, specifically when operating with MPM event, worker, or prefork.
What is CVE-2019-0211?
In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, code executed in less-privileged child processes or threads could run arbitrary code with the parent process's privileges by manipulating the scoreboard.
The Impact of CVE-2019-0211
- Affected Versions: Apache HTTP Server 2.4.17 to 2.4.38
- Vulnerability Type: Privilege Escalation
- Systems Not Affected: Non-Unix systems
Technical Details of CVE-2019-0211
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The flaw in Apache HTTP Server versions 2.4.17 to 2.4.38 allows scripts executed by an in-process scripting interpreter to execute arbitrary code with root privileges by manipulating the scoreboard.
Affected Systems and Versions
- Product: Apache HTTP Server
- Vendor: Apache
- Versions Affected: 2.4.17 to 2.4.38
Exploitation Mechanism
The vulnerability enables code executed in child processes or threads with lower privileges to run arbitrary code using the parent process's privileges by manipulating the scoreboard.
Mitigation and Prevention
To address CVE-2019-0211, consider the following mitigation strategies:
Immediate Steps to Take
- Update Apache HTTP Server to a non-vulnerable version.
- Monitor for any unauthorized access or unusual activities on the server.
Long-Term Security Practices
- Implement the principle of least privilege to restrict access rights for users and processes.
- Regularly review and update server configurations and security settings.
Patching and Updates
- Apply security patches provided by Apache or relevant vendors promptly.