CVE-2021-33630 : What You Need to Know
Learn about CVE-2021-33630, a NULL Pointer Dereference vulnerability in the openEuler kernel allowing Pointer Manipulation. Discover impact, affected systems, and mitigation steps.
A NULL Pointer Dereference vulnerability in the openEuler kernel on Linux (network modules) allows Pointer Manipulation. The issue affects the openEuler kernel versions from 4.19.90 before 4.19.90-2401.3.
Understanding CVE-2021-33630
This vulnerability, identified as CAPEC-129 Pointer Manipulation, poses a MEDIUM severity threat with a CVSS base score of 5.5.
What is CVE-2021-33630?
The CVE-2021-33630, also known as NULL-ptr-deref in network sched, is a vulnerability in the openEuler kernel that permits Pointer Manipulation, potentially leading to unauthorized access or denial of service.
The Impact of CVE-2021-33630
With a high availability impact, this vulnerability can be exploited locally without user interaction, making it crucial to address promptly to prevent potential security breaches.
Technical Details of CVE-2021-33630
The vulnerability is associated with the program file net/sched/sch_cbs.C and affects openEuler kernel versions from 4.19.90 before 4.19.90-2401.3.
Vulnerability Description
The NULL Pointer Dereference vulnerability allows attackers to manipulate pointers, posing a risk of unauthorized access or system disruption.
Affected Systems and Versions
The issue impacts openEuler kernel versions from 4.19.90 before 4.19.90-2401.3, specifically within the network modules.
Exploitation Mechanism
Attackers can exploit this vulnerability by manipulating pointers within the network modules, potentially leading to unauthorized access or service disruption.
Mitigation and Prevention
It is crucial to take immediate steps to address CVE-2021-33630 to enhance the security of affected systems.
Immediate Steps to Take
Ensure prompt patching of the openEuler kernel to version 4.19.90-2401.3 or later to mitigate the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Implement regular security updates and patches, conduct security audits, and monitor for any unusual network activities to enhance the overall security posture.
Patching and Updates
Stay informed about security bulletins and releases from openEuler to apply relevant patches and updates to protect systems from known vulnerabilities.