CVE-2023-3863 : Security Advisory and Response

This CVE-2023-3863 vulnerability involves a use-after-free flaw in nfc_llcp_find_local in net/nfc/llcp_core.c within the Linux kernel. Exploitation of this vulnerability could allow a local user with specific privileges to impact a kernel information leak issue.

Understanding CVE-2023-3863

This section will cover essential details about CVE-2023-3863, its impact, technical details, affected systems, and mitigation strategies.

What is CVE-2023-3863?

CVE-2023-3863 is a use-after-free vulnerability found in nfc_llcp_find_local in net/nfc/llcp_core.c within the Linux kernel. It poses a risk where a local user with elevated privileges can potentially exploit the flaw to impact kernel information leak.

The Impact of CVE-2023-3863

The impact of CVE-2023-3863 is deemed as moderate with a CVSS base score of 6.4. It presents a medium-severity risk, with high confidentiality, integrity, and availability impacts, requiring high privileges to exploit locally.

Technical Details of CVE-2023-3863

This section delves into the technical aspects of CVE-2023-3863, including vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability lies in nfc_llcp_find_local in net/nfc/llcp_core.c in NFC in the Linux kernel, leading to a use-after-free flaw that could be exploited by a local user with specialized privileges to induce a kernel information leak.

Affected Systems and Versions

The vulnerability affects various Red Hat Enterprise Linux versions, including 6, 7, 8, and 9. The Fedora distribution is also impacted. Specific package details and versions can be found through the provided collection URLs.

Exploitation Mechanism

Exploiting CVE-2023-3863 requires a local user with high privileges. By manipulating the nfc_llcp_find_local function in the Linux kernel, an attacker can trigger the use-after-free vulnerability to execute malicious actions.

Mitigation and Prevention

In light of CVE-2023-3863, adopting effective mitigation and prevention measures is crucial to safeguard systems and data against potential exploits.

Immediate Steps to Take

As a preventive measure, users are advised to stay informed about security updates and patches released by the Linux kernel and affected vendors. Regular monitoring and updating of systems can help mitigate the risk associated with CVE-2023-3863.

Long-Term Security Practices

Implementing robust access control policies, user privilege management, and security monitoring can enhance overall system security. Regular security audits and vulnerability assessments are recommended to identify and address potential threats proactively.

Patching and Updates

Promptly applying security patches and updates provided by Red Hat, Linux kernel maintainers, and other relevant vendors is essential to address CVE-2023-3863 effectively. Keeping systems up to date with the latest security fixes can mitigate the risk of exploitation.