CVE-2020-14331 Explained : Impact and Mitigation

A flaw in the Linux kernel's implementation of the invert video code on VGA consoles can lead to an out-of-bounds write when a local attacker attempts to resize the console. This vulnerability could allow a local user to crash the system and potentially escalate privileges.

Understanding CVE-2020-14331

This CVE identifies a vulnerability in the Linux kernel that could be exploited by a local attacker to disrupt system operation and potentially gain elevated privileges.

What is CVE-2020-14331?

The vulnerability in the Linux kernel's handling of VGA consoles allows a local attacker to trigger an out-of-bounds write by resizing the console, potentially leading to system crashes and privilege escalation.

The Impact of CVE-2020-14331

The highest risk posed by this vulnerability is to data confidentiality, integrity, and system availability. A successful exploit could result in system crashes and unauthorized privilege escalation.

Technical Details of CVE-2020-14331

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw in the Linux kernel's VGA console handling triggers an out-of-bounds write when a local attacker attempts to resize the console using the ioctl VT_RESIZE, potentially leading to system crashes.

Affected Systems and Versions

All versions of the Linux kernel are affected by this vulnerability.

Exploitation Mechanism

By calling the ioctl VT_RESIZE to resize the console, a local attacker can trigger the out-of-bounds write, leading to system instability and potential privilege escalation.

Mitigation and Prevention

Protecting systems from CVE-2020-14331 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers promptly.
Monitor for any unusual console resizing activities that could indicate exploitation attempts.

Long-Term Security Practices

Implement the principle of least privilege to restrict access to critical system components.
Regularly update and patch the Linux kernel to address known vulnerabilities.
Conduct security training for users to raise awareness of potential risks and best practices.
Employ intrusion detection systems to detect and respond to unauthorized system changes.

Patching and Updates

Stay informed about security updates and patches released by the Linux kernel maintainers to address CVE-2020-14331 and other vulnerabilities.