CVE-2023-4256 Explained : Impact and Mitigation

This CVE-2023-4256 was published by Red Hat on December 21, 2023, and has a moderate severity rating. It involves a double free vulnerability in the tcpedit_dlt_cleanup() function within plugins/dlt_plugins.c in tcpreplay's tcprewrite tool.

Understanding CVE-2023-4256

This CVE highlights a vulnerability in the tcprewrite tool that can be exploited by a local attacker to launch a Denial of Service (DoS) attack by supplying a specially crafted file to the tcprewrite binary.

What is CVE-2023-4256?

The vulnerability identified in CVE-2023-4256 exists within tcpreplay's tcprewrite and involves a double free vulnerability in the tcpedit_dlt_cleanup() function in plugins/dlt_plugins.c file. By leveraging this flaw, an attacker can disrupt the normal operation of the system, causing a DoS condition.

The Impact of CVE-2023-4256

The impact of this vulnerability is rated as moderate, with a CVSS base score of 5.5. Although it requires local access to exploit, the availability impact is high, making it crucial to address this issue promptly.

Technical Details of CVE-2023-4256

This section dives into the specific technical aspects of the CVE, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability lies in a double free issue in the tcpedit_dlt_cleanup() function within plugins/dlt_plugins.c in tcpreplay's tcprewrite tool. It can be abused by a local attacker through a specially crafted file to achieve a DoS attack.

Affected Systems and Versions

The affected products include "tcpreplay" and related packages such as "Extra Packages for Enterprise Linux" in Fedora. Users of these software versions need to be vigilant about applying patches and updates to mitigate the risk.

Exploitation Mechanism

Exploiting this vulnerability requires a malicious actor to provide a specifically crafted file to the tcprewrite binary. By triggering the double free vulnerability, the attacker can disrupt the program flow, leading to a DoS scenario.

Mitigation and Prevention

To address CVE-2023-4256 effectively, it is vital to implement immediate steps, adopt long-term security practices, and ensure timely patching and updates are applied to the affected systems.

Immediate Steps to Take

Users are advised to apply any patches or updates provided by the software vendor promptly. Additionally, access controls and proper file validation can help mitigate the risk of exploitation.

Long-Term Security Practices

Maintaining up-to-date software versions, implementing security best practices, and conducting regular vulnerability assessments can enhance overall system security and resilience against potential threats.

Patching and Updates

Stay informed about security advisories from the software vendor, such as Red Hat, and apply recommended patches or updates as soon as they become available. Regularly monitor for new developments and security releases to stay protected from emerging vulnerabilities.