CVE-2023-29458 : Security Advisory and Response

A detailed analysis of CVE-2023-29458, focusing on the impact, technical details, and mitigation strategies.

Understanding CVE-2023-29458

Exploiting a bug in Duktape 2.6, this vulnerability causes JavaScript to crash when inserting excessive values into valstack.

What is CVE-2023-29458?

CVE-2023-29458 pertains to a bug in a 3rd-party JavaScript engine, Duktape 2.6, affecting Zabbix's modules like Proxy and Server.

The Impact of CVE-2023-29458

The vulnerability poses a medium-severity risk, leading to JavaScript crashes due to excessive valstack values, impacting Zabbix versions 5.0.0 to 7.0.0alpha1.

Technical Details of CVE-2023-29458

Understanding the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

Duktape 2.6 bug leads to JavaScript crashes by overwhelming valstack with values, compromising the stability of Zabbix's modules.

Affected Systems and Versions

Zabbix versions 5.0.0 to 7.0.0alpha1 utilizing Duktape 2.6 are vulnerable, impacting the Proxy and Server modules.

Exploitation Mechanism

Exploiting the bug in Duktape 2.6, threat actors can crash JavaScript by introducing an overflow of values into valstack.

Mitigation and Prevention

Effective strategies to mitigate the CVE-2023-29458 vulnerability and prevent future incidents.

Immediate Steps to Take

Users are advised to apply patches, restrict input values, and monitor system stability to prevent JavaScript crashes.

Long-Term Security Practices

Establishing regular security updates, conducting code reviews, and enhancing input validation processes can prevent similar vulnerabilities.

Patching and Updates

Regularly updating Zabbix to versions above 5.0.35rc1, 6.0.18rc1, 6.4.3rc1, and 7.0.0alpha1 can address the Duktape bug and enhance system security.