CVE-2019-5611 Explained : Impact and Mitigation
Learn about CVE-2019-5611, a FreeBSD vulnerability in versions 12.0-RELEASE before 12.0-RELEASE-p10, 11.3-RELEASE before 11.3-RELEASE-p3, and 11.2-RELEASE before 11.2-RELEASE-p14, potentially causing a denial of service attack.
A vulnerability in FreeBSD versions 12.0-RELEASE before 12.0-RELEASE-p10, 11.3-RELEASE before 11.3-RELEASE-p3, and 11.2-RELEASE before 11.2-RELEASE-p14 could lead to a denial of service attack due to a lack of verification in the function organizing data in a chain of mbufs.
Understanding CVE-2019-5611
This CVE details a vulnerability in FreeBSD that could result in a remote denial of service due to a missing check in the function responsible for arranging data in a chain of mbufs.
What is CVE-2019-5611?
Prior to specific versions in FreeBSD, a lack of verification in the data organization function could lead to non-contiguous returned data, triggering a kernel panic and causing a denial of service attack.
The Impact of CVE-2019-5611
The vulnerability could be exploited remotely, potentially resulting in a denial of service attack on affected systems.
Technical Details of CVE-2019-5611
This section provides more technical insights into the vulnerability.
Vulnerability Description
The issue arises from a missing check in the function responsible for organizing data in a chain of mbufs, potentially leading to non-contiguous returned data.
Affected Systems and Versions
- FreeBSD 12.0-RELEASE before 12.0-RELEASE-p10
- FreeBSD 11.3-RELEASE before 11.3-RELEASE-p3
- FreeBSD 11.2-RELEASE before 11.2-RELEASE-p14
Exploitation Mechanism
By introducing additional checks in the IPv6 stack, the vulnerability can be detected, triggering a kernel panic and causing a remote denial of service.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.
Immediate Steps to Take
- Apply the necessary patches provided by FreeBSD to mitigate the vulnerability.
- Monitor security advisories for any updates or additional mitigation steps.
Long-Term Security Practices
- Regularly update and patch FreeBSD systems to ensure the latest security fixes are in place.
- Implement network security measures to detect and prevent potential denial of service attacks.
- Conduct regular security audits to identify and address any vulnerabilities.
- Stay informed about security best practices and emerging threats.
Patching and Updates
Ensure that all affected systems are updated with the latest patches released by FreeBSD to address the vulnerability.