CVE-2018-20784 : Exploit Details and Defense Strategies
Learn about CVE-2018-20784, a vulnerability in the Linux kernel prior to version 4.20.2 that can lead to denial of service attacks or other unknown impacts. Find out how to mitigate and prevent this issue.
A vulnerability in the Linux kernel prior to version 4.20.2 can lead to a denial of service attack or other unknown impacts.
Understanding CVE-2018-20784
What is CVE-2018-20784?
This vulnerability exists in the fair.c file in the sched directory of the Linux kernel before version 4.20.2. It affects leaf cfs_rq's improperly, potentially resulting in a denial of service attack or other impacts when a high system load is induced.
The Impact of CVE-2018-20784
The vulnerability can lead to a denial of service attack, specifically causing an infinite loop in the function update_blocked_averages, or other unknown impacts when the system load is increased.
Technical Details of CVE-2018-20784
Vulnerability Description
The issue arises from mishandling leaf cfs_rq's in the Linux kernel, allowing attackers to trigger a denial of service or other impacts by inducing a high load.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions affected: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by inducing a high system load, causing the affected function to enter an infinite loop.
Mitigation and Prevention
Immediate Steps to Take
- Apply the necessary patches provided by the Linux kernel maintainers.
- Monitor system performance for any signs of unusual activity.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version.
- Implement proper system load monitoring and management practices.
Patching and Updates
- Update the Linux kernel to version 4.20.2 or newer to mitigate the vulnerability.