CVE-2023-6931 Explained : Impact and Mitigation

This is a detailed overview of CVE-2023-6931, a vulnerability assigned by Google affecting the Linux kernel's Performance Events system component.

Understanding CVE-2023-6931

This CVE, identified as an out-of-bounds write vulnerability in the Linux kernel's Performance Events system component, poses a risk of local privilege escalation.

What is CVE-2023-6931?

The vulnerability in question involves a heap out-of-bounds write scenario where a perf_event's read_size can overflow, leading to a heap out-of-bounds increment or write in perf_read_group().

The Impact of CVE-2023-6931

With a base severity rating of 7.8 (high), the vulnerability could result in a privilege escalation attack, specifically categorized as CAPEC-233 Privilege Escalation.

Technical Details of CVE-2023-6931

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability allows for an out-of-bounds write in the Linux kernel's Performance Events system component, potentially enabling attackers to escalate their privileges.

Affected Systems and Versions

The affected system is the Linux kernel's Performance Events system component with the affected package name "kernel" and versions ranging from 4.3 to less than 6.7. Immediate action is advised for systems falling within this version range.

Exploitation Mechanism

The vulnerability can be exploited locally through a specific method involving the overflow of a perf_event's read_size, ultimately leading to a heap out-of-bounds increment or write in the perf_read_group() function.

Mitigation and Prevention

To address CVE-2023-6931 and prevent potential exploits, the following measures should be taken:

Immediate Steps to Take

Upgrade systems beyond commit 382c27f4ed28f803b1f1473ac2d8db0afc795a1b in the Linux kernel to mitigate the vulnerability.

Long-Term Security Practices

Implement regular security updates and patches to ensure system resilience against known vulnerabilities.

Patching and Updates

Stay informed about security advisories and updates provided by the Linux kernel development team to address vulnerabilities promptly.