CVE-2021-3492 : Vulnerability Insights and Analysis
Discover details of CVE-2021-3492, impacting Ubuntu Linux kernels. Learn the impact, affected versions, and mitigation strategies for this high-severity vulnerability.
The CVE-2021-3492 vulnerability, also known as Ubuntu linux kernel shiftfs file system double free vulnerability, impacts Ubuntu Linux kernels versions less than 5.8.0-50.56 and 5.4.0-72.80. It was discovered on April 15, 2021, and poses a significant risk to affected systems.
Understanding CVE-2021-3492
This section delves into the vulnerability's nature, impact, technical details, and mitigation strategies.
What is CVE-2021-3492?
CVE-2021-3492, a double free vulnerability in the Shiftfs file system, arises due to improper handling of faults, potentially leading to denial of service attacks or arbitrary code execution.
The Impact of CVE-2021-3492
The vulnerability allows attackers to exploit Ubuntu Linux kernels, causing kernel memory exhaustion or gaining elevated privileges via malicious code execution.
Technical Details of CVE-2021-3492
This section highlights the specifics of the vulnerability to aid in understanding and addressing the issue.
Vulnerability Description
Shiftfs mishandles faults during copy_from_user(), resulting in double-free situations or unreleased memory, creating avenues for exploitation.
Affected Systems and Versions
Ubuntu Linux kernels before versions 5.8.0-50.56 and 5.4.0-72.80 are vulnerable to this flaw, necessitating immediate attention.
Exploitation Mechanism
Attackers could leverage this vulnerability to trigger denial of service conditions or execute arbitrary code by exploiting the Shiftfs file system flaw.
Mitigation and Prevention
To safeguard systems from CVE-2021-3492, prompt actions, robust security practices, and timely updates are imperative.
Immediate Steps to Take
Organizations must apply relevant patches, monitor system integrity, and implement access controls to mitigate the risk effectively.
Long-Term Security Practices
Establishing regular security assessments, enforcing the principle of least privilege, and promoting security awareness can fortify systems against similar vulnerabilities.
Patching and Updates
Continuous monitoring of security advisories, timely installation of patches, and proactive security measures are vital for ensuring system resilience and protection against potential threats.