CVE-2017-8797 : Vulnerability Insights and Analysis
Learn about CVE-2017-8797, a vulnerability in Linux kernel NFSv4 server allowing remote attackers to trigger a denial of service attack and system compromise. Find mitigation steps and long-term security practices here.
In versions of the Linux kernel prior to 4.11.3, a vulnerability exists in the NFSv4 server that can be exploited by a remote attacker to cause a denial of service (DoS) attack and potentially lead to a soft-lockup of the entire system.
Understanding CVE-2017-8797
What is CVE-2017-8797?
The vulnerability in the Linux kernel's NFSv4 server arises when processing specific operands in UDP packets from a remote attacker, leading to an OOPS and potential system compromise.
The Impact of CVE-2017-8797
The vulnerability allows an attacker to trigger a denial of service attack on the knfsd process and potentially cause a soft-lockup of the entire system.
Technical Details of CVE-2017-8797
Vulnerability Description
The Linux kernel's NFSv4 server fails to properly validate the layout type when processing certain operands, resulting in an uninitialized type value that can be exploited by an attacker.
Affected Systems and Versions
- Affected versions: Linux kernel versions prior to 4.11.3
Exploitation Mechanism
- The vulnerability occurs when processing NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker.
Mitigation and Prevention
Immediate Steps to Take
- Update to Linux kernel version 4.11.3 or later to mitigate the vulnerability.
- Monitor vendor advisories and apply patches promptly.
Long-Term Security Practices
- Regularly update and patch the Linux kernel to address security vulnerabilities.
Patching and Updates
- Stay informed about security updates and apply them as soon as they are available.