CVE-2023-42753 : Security Advisory and Response

An array indexing vulnerability was found in the netfilter subsystem of the Linux kernel. This issue could allow a local user to crash the system or potentially escalate their privileges by exploiting an integer underflow vulnerability. Learn more about the impact, affected systems, and mitigation steps below.

Understanding CVE-2023-42753

This section delves into the details of the CVE-2023-42753 vulnerability.

What is CVE-2023-42753?

CVE-2023-42753 is an array indexing vulnerability in the netfilter subsystem of the Linux kernel. It arises due to a missing macro that leads to a miscalculation in the array offset, potentially allowing attackers to manipulate memory buffers out-of-bounds.

The Impact of CVE-2023-42753

Exploiting this vulnerability can result in a local user crashing the system or potentially escalating their privileges.

Technical Details of CVE-2023-42753

This section explores the technical aspects of CVE-2023-42753.

Vulnerability Description

The vulnerability stems from an integer underflow in the netfilter subsystem, allowing attackers to increment/decrement memory buffers out-of-bound.

Affected Systems and Versions

Affected Systems: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Fedora
Unaffected Systems: Specific versions of kernel packages for different Red Hat Enterprise Linux versions

Exploitation Mechanism

Attackers can manipulate memory buffers and potentially crash the system or gain escalated privileges through exploitation of the integer underflow vulnerability.

Mitigation and Prevention

In this section, we cover the steps to mitigate and prevent CVE-2023-42753.

Immediate Steps to Take

Update the affected packages to the latest versions provided by the vendor

Long-Term Security Practices

Regularly monitor for security advisories and updates from Red Hat and other relevant sources
Implement strict access controls and privilege management to limit the impact of potential exploits

Patching and Updates

Ensure timely application of security patches and updates to all affected systems to mitigate the vulnerability.

For more information on CVE-2023-42753 and related security advisories, refer to the provided references.