CVE-2017-18193 : Security Advisory and Response
Learn about CVE-2017-18193, a Linux kernel vulnerability allowing denial of service attacks by mishandling extent trees. Find mitigation steps and update recommendations here.
The Linux kernel prior to version 4.13 has a mishandling issue in fs/f2fs/extent_cache.c regarding extent trees, leading to a denial of service vulnerability.
Understanding CVE-2017-18193
What is CVE-2017-18193?
This CVE refers to a vulnerability in the Linux kernel that allows local users to cause a denial of service by exploiting a flaw in handling extent trees.
The Impact of CVE-2017-18193
The vulnerability can be exploited by local users running applications with multiple threads, resulting in a denial of service (BUG).
Technical Details of CVE-2017-18193
Vulnerability Description
The flaw in fs/f2fs/extent_cache.c mishandles extent trees, enabling local users to trigger a denial of service by running applications with multiple threads.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: All versions prior to Linux kernel 4.13
Exploitation Mechanism
The vulnerability can be exploited by local users executing applications with multiple threads, causing a denial of service.
Mitigation and Prevention
Immediate Steps to Take
- Apply patches provided by the Linux kernel to update to version 4.13 or newer.
- Monitor for any unusual system behavior that could indicate exploitation of the vulnerability.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
- Implement least privilege access controls to limit the impact of potential attacks.
Patching and Updates
- Keep the Linux kernel up to date with the latest security patches to address vulnerabilities like CVE-2017-18193.