CVE-2023-32269 : Exploit Details and Defense Strategies

An issue was discovered in the Linux kernel before version 6.1.11, leading to a use-after-free vulnerability in net/netrom/af_netrom.c. This vulnerability allows an attacker to exploit a successfully connected AF_NETROM socket under certain conditions.

Understanding CVE-2023-32269

This section covers the impact, technical details, and mitigation strategies related to CVE-2023-32269.

What is CVE-2023-32269?

CVE-2023-32269 is a use-after-free vulnerability in the Linux kernel, affecting versions before 6.1.11. The vulnerability arises from the mishandling of accept operations on AF_NETROM sockets.

The Impact of CVE-2023-32269

Exploitation of this vulnerability requires either netrom routing configuration on the system or the attacker possessing the CAP_NET_ADMIN capability. Successful exploitation could lead to unauthorized access or service disruption.

Technical Details of CVE-2023-32269

Below are the specific technical details of the vulnerability.

Vulnerability Description

The issue is due to the improper handling of accept operations for connected AF_NETROM sockets in net/netrom/af_netrom.c, resulting in a use-after-free condition.

Affected Systems and Versions

All Linux kernel versions prior to 6.1.11 are affected by this vulnerability. Both systems with netrom routing configured and those where the attacker has the CAP_NET_ADMIN capability are at risk.

Exploitation Mechanism

An attacker could exploit this vulnerability by utilizing a successfully connected AF_NETROM socket in conjunction with netrom routing or the CAP_NET_ADMIN capability.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-32269, follow these recommendations.

Immediate Steps to Take

Disable netrom routing if not explicitly required and limit the CAP_NET_ADMIN capability access to authorized users only.

Long-Term Security Practices

Regularly update the Linux kernel to version 6.1.11 or newer to ensure the vulnerability is patched and adopt secure coding practices to prevent similar issues.

Patching and Updates

Refer to the provided references for detailed patch information and update your system to the latest Linux kernel version to address CVE-2023-32269.