CVE-2021-43942 : Vulnerability Insights and Analysis

CVE-2021-43942 was published on December 30, 2021, by Atlassian. The vulnerability affects versions of Jira Server and Jira Data Center, allowing remote attackers to conduct Reflected Cross-Site Scripting (XSS) attacks.

Understanding CVE-2021-43942

The vulnerability in Atlassian Jira Server and Data Center poses a risk of arbitrary HTML or JavaScript injection through a specific endpoint.

What is CVE-2021-43942?

CVE-2021-43942 enables attackers to execute XSS attacks by tricking users into visiting malicious websites, impacting versions before 8.13.15 and from 8.14.0 to 8.20.3.

The Impact of CVE-2021-43942

Allows remote attackers to inject arbitrary HTML or JavaScript
Exploits a Reflected Cross-Site Scripting (XSS) vulnerability

Technical Details of CVE-2021-43942

The technical aspects of this vulnerability are crucial for understanding its implications.

Vulnerability Description

The flaw in Jira Server and Data Center permits the injection of malicious code via the /rest/collectors/1.0/template/custom endpoint.

Affected Systems and Versions

Atlassian Jira Server versions less than 8.13.15 and 8.14.0 to 8.20.3
Atlassian Jira Data Center versions falling into the same range

Exploitation Mechanism

Attackers exploit this vulnerability by luring users to visit a corrupted website, enabling the injection of harmful scripts.

Mitigation and Prevention

Ensuring the security of affected systems and preventing future exploits are key actions for mitigating this vulnerability.

Immediate Steps to Take

Update Jira Server and Data Center to versions beyond 8.20.3
Educate users about phishing and suspicious website visits
Implement content security policies to mitigate XSS attacks

Long-Term Security Practices

Regular security training for employees and IT personnel
Conduct regular security audits and penetration testing

Patching and Updates

Apply all provided security patches and updates promptly to address this vulnerability