CVE-2023-35788 : Security Advisory and Response

An issue was discovered in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before 6.3.7. It allows an out-of-bounds write in the flower classifier code via TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets. This may result in denial of service or privilege escalation.

Understanding CVE-2023-35788

This vulnerability affects the Linux kernel before version 6.3.7, allowing an attacker to execute a denial of service attack or potentially escalate their privileges.

What is CVE-2023-35788?

The CVE-2023-35788 is a vulnerability found in the Linux kernel that enables an out-of-bounds write in the flower classifier code through specific packets, potentially leading to denial of service or privilege escalation.

The Impact of CVE-2023-35788

Exploitation of this vulnerability could result in a denial of service condition or allow a malicious actor to gain elevated privileges on the affected system.

Technical Details of CVE-2023-35788

The following are some technical details related to CVE-2023-35788:

Vulnerability Description

The vulnerability exists in fl_set_geneve_opt in net/sched/cls_flower.c in the Linux kernel before version 6.3.7, allowing an out-of-bounds write via specific packets.

Affected Systems and Versions

The vulnerability affects Linux kernel versions prior to 6.3.7.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets to trigger an out-of-bounds write in the flower classifier code.

Mitigation and Prevention

To address CVE-2023-35788, consider the following mitigation strategies:

Immediate Steps to Take

Update the Linux kernel to version 6.3.7 or later to fix the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implement security best practices to secure your systems proactively.

Patching and Updates

Regularly apply security patches and updates to ensure your system is protected from known vulnerabilities.