CVE-2023-1829 : Exploit Details and Defense Strategies

This article delves into the details of CVE-2023-1829, a use-after-free vulnerability found in the Linux Kernel's traffic control index filter (tcindex).

Understanding CVE-2023-1829

CVE-2023-1829 is a vulnerability in the Linux Kernel's traffic control index filter (tcindex) that can lead to local privilege escalation. This flaw arises from the tcindex_delete function not properly deactivating filters in the case of perfect hashes while deleting the underlying structure, potentially resulting in double freeing of the structure. This vulnerability enables a local attacker user to elevate their privileges to root.

What is CVE-2023-1829?

The CVE-2023-1829 vulnerability, identified in the Linux Kernel's traffic control index filter, allows a local attacker user to exploit a use-after-free issue for achieving local privilege escalation.

The Impact of CVE-2023-1829

The impact of CVE-2023-1829 is classified under CAPEC-233 (Privilege Escalation), signifying the severity of the vulnerability and the potential consequences of unauthorized privilege elevation.

Technical Details of CVE-2023-1829

In this section, we will explore the specific technical aspects of the CVE-2023-1829 vulnerability.

Vulnerability Description

The vulnerability in the Linux Kernel's tcindex can be leveraged to achieve local privilege escalation through a use-after-free scenario. The improper deactivation of filters and potential double freeing of the underlying structure create an exploitable condition for attackers.

Affected Systems and Versions

The affected system by CVE-2023-1829 is the Linux Kernel, specifically version 3.8, up to version 6.2. Users operating on these versions are at risk of the privilege escalation vulnerability associated with the tcindex module.

Exploitation Mechanism

The exploitation of CVE-2023-1829 involves manipulating the use-after-free condition within the tcindex module to elevate privileges locally. Attackers can target this vulnerability to gain unauthorized access with escalated privileges.

Mitigation and Prevention

Understanding how to mitigate and prevent the exploitation of CVE-2023-1829 is crucial for ensuring the security of systems and data.

Immediate Steps to Take

Upgrade the Linux Kernel version beyond commit 8c710f75256bb3cf05ac7b1672c82b92c43f3d28 to patch the vulnerability.

Long-Term Security Practices

Regularly update and patch the Linux Kernel to mitigate known vulnerabilities and enhance system security.

Patching and Updates

Stay informed about security advisories and updates from authoritative sources to address vulnerabilities promptly and safeguard against exploits.