CVE-2021-21371 Explained : Impact and Mitigation

Tenable for Jira Cloud is an open source project that allows the execution of arbitrary code through YAML configuration files before version 1.1.21. This article provides insights into the vulnerability, its impact, technical details, and mitigation strategies.

Understanding CVE-2021-21371

This section delves into what CVE-2021-21371 entails, its impact, and the affected systems.

What is CVE-2021-21371?

CVE-2021-21371 relates to a vulnerability in Tenable for Jira Cloud, specifically versions prior to 1.1.21. It allows an attacker with local access to run arbitrary code using a specially crafted YAML configuration file.

The Impact of CVE-2021-21371

The vulnerability has a CVSS base score of 5, with low confidentiality and integrity impacts. An attacker can exploit this issue without privileges and with user interaction required. The attack complexity is low, with a local attack vector.

Technical Details of CVE-2021-21371

This section provides technical details, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The issue stems from the ability to execute arbitrary commands through the

yaml.load()

method, allowing attackers to run malicious code.

Affected Systems and Versions

The impacted system is Tenable for Jira Cloud, specifically versions earlier than 1.1.21.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging a specially crafted YAML configuration file to execute arbitrary code.

Mitigation and Prevention

Below are the steps you can take to mitigate the risks posed by CVE-2021-21371.

Immediate Steps to Take

Users should update Tenable for Jira Cloud to version 1.1.21 or higher to prevent the execution of untrusted code.

Long-Term Security Practices

Implement secure coding practices, avoid deserializing untrusted data, and regularly update software to prevent similar vulnerabilities.

Patching and Updates

Stay informed about security advisories, apply patches promptly, and monitor for any suspicious activities or unauthorized access attempts.