CVE-2023-3777 : Vulnerability Insights and Analysis

This CVE-2023-3777 article discusses a use-after-free vulnerability found in the Linux kernel's netfilter: nf_tables component, impacting the Kernel version 5.9.

Understanding CVE-2023-3777

This vulnerability allows for local privilege escalation, potentially leading to unauthorized access to the system.

What is CVE-2023-3777?

CVE-2023-3777 is a use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component. Specifically, the vulnerability occurs in the nf_tables_delrule() function when flushing table rules. It does not verify whether the chain is bound, and under certain conditions, the chain's owner rule can release objects.

The Impact of CVE-2023-3777

The impact of this vulnerability is classified as "Privilege Escalation," which could allow an attacker to elevate their local privileges on the affected system.

Technical Details of CVE-2023-3777

This section provides more insight into the vulnerability affecting the Linux kernel's nf_tables component.

Vulnerability Description

The use-after-free vulnerability in nf_tables can be leveraged for achieving local privilege escalation. It stems from the lack of validation while flushing table rules.

Affected Systems and Versions

The Linux Kernel version 5.9 is affected by this vulnerability, with a version less than 6.5 being vulnerable. The component impacted is the nf_tables within the Kernel.

Exploitation Mechanism

Exploitation of this vulnerability can potentially grant an attacker unauthorized access to the system, leading to local privilege escalation.

Mitigation and Prevention

To safeguard systems from CVE-2023-3777, prompt actions should be taken to mitigate the risks associated with this vulnerability.

Immediate Steps to Take

Upgrade the Linux Kernel version past commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8.

Long-Term Security Practices

Regularly update system components and software to patch known vulnerabilities promptly.

Patching and Updates

Update the Kernel to a version higher than 6.5 to eliminate the use-after-free vulnerability in the nf_tables component. Regularly monitor security advisories and apply patches promptly.