CVE-2017-18208 : Security Advisory and Response
Learn about CVE-2017-18208, a Linux kernel vulnerability allowing local users to trigger a denial of service. Find mitigation steps and long-term security practices here.
In the Linux kernel version prior to 4.14.4, a vulnerability exists in the madvise_willneed function that can be exploited by local users to cause a denial of service. This can lead to an infinite loop by triggering the use of MADVISE_WILLNEED for a DAX mapping.
Understanding CVE-2017-18208
This CVE entry highlights a vulnerability in the Linux kernel that could be exploited by local users to disrupt system operations.
What is CVE-2017-18208?
The vulnerability in the madvise_willneed function in the Linux kernel version before 4.14.4 allows local users to trigger an infinite loop, leading to a denial of service.
The Impact of CVE-2017-18208
The exploitation of this vulnerability can result in a denial of service condition, potentially causing system instability and unresponsiveness.
Technical Details of CVE-2017-18208
This section provides more in-depth technical information about the vulnerability.
Vulnerability Description
The madvise_willneed function in mm/madvise.c in the Linux kernel before 4.14.4 allows local users to cause a denial of service (infinite loop) by triggering use of MADVISE_WILLNEED for a DAX mapping.
Affected Systems and Versions
- Affected systems: Linux kernel versions prior to 4.14.4
- Affected versions: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by local users intentionally invoking the use of MADVISE_WILLNEED for a DAX mapping, leading to a denial of service.
Mitigation and Prevention
Protecting systems from this vulnerability requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant patches and updates to the Linux kernel to mitigate the vulnerability.
- Monitor system logs for any unusual activities that could indicate exploitation attempts.
Long-Term Security Practices
- Implement the principle of least privilege to restrict user access and actions.
- Regularly update and patch the system to address known vulnerabilities.
- Conduct security training for users to raise awareness about potential threats and best practices.
Patching and Updates
Ensure timely installation of security patches and updates provided by the Linux kernel maintainers to address the vulnerability.