CVE-2023-42752 : Vulnerability Insights and Analysis

An integer overflow flaw in the Linux kernel has been identified as CVE-2023-42752, potentially leading to exploitable memory access due to a vulnerability in the igmpv3_newpack function. This can allow attackers to manipulate the kernel and execute malicious actions on systems lacking SMAP protection. Understanding the details and impact of this CVE is crucial for ensuring system security.

Understanding CVE-2023-42752

This section delves into key aspects of the CVE, shedding light on its implications and affected systems.

What is CVE-2023-42752?

CVE-2023-42752 refers to an integer overflow flaw discovered in the Linux kernel, which can result in the allocation of

skb_shared_info

in userspace. For systems without SMAP protection, this flaw becomes exploitable as

skb_shared_info

contains references to function pointers.

The Impact of CVE-2023-42752

The vulnerability poses a medium level threat with a base CVSS score of 5.5. Attackers with low privileges can exploit this flaw locally to cause high availability impact on affected systems. Understanding the potential consequences of this vulnerability is essential to prevent unauthorized access and system compromise.

Technical Details of CVE-2023-42752

This section provides a deeper insight into the technical aspects of the CVE, including vulnerability description, affected systems, and exploitation mechanisms.

Vulnerability Description

The identified integer overflow flaw allows attackers to manipulate the kernel by exploiting the allocation of

skb_shared_info

in userspace. This manipulation can lead to unauthorized access and the execution of malicious actions on vulnerable systems.

Affected Systems and Versions

The following systems are affected by CVE-2023-42752:

Kernel 6.6-rc1 (Unaffected)
Red Hat Enterprise Linux 6, 7, 8, 9
Fedora

Exploitation Mechanism

Attackers can exploit this vulnerability locally with low privileges. By leveraging the flaws in the Linux kernel related to

skb_shared_info

, malicious actors can achieve unauthorized system access and disrupt its availability.

Mitigation and Prevention

Protecting systems from CVE-2023-42752 requires immediate action and long-term security practices to mitigate risks effectively.

Immediate Steps to Take

Apply security patches provided by the Linux kernel and Red Hat for the affected versions.
Monitor system logs for any suspicious activities that may indicate exploitation of this vulnerability.

Long-Term Security Practices

Implement security best practices such as least privilege access and network segmentation to reduce the attack surface.
Regularly update and patch systems to address any known vulnerabilities and enhance overall security posture.

Patching and Updates

Ensure timely installation of security updates released by the Linux kernel and Red Hat to address CVE-2023-42752 and strengthen system defenses against potential exploitation.