CVE-2021-27909 : Exploit Details and Defense Strategies

A security vulnerability labeled as CVE-2021-27909 has been identified in Mautic versions prior to 3.3.4/4.0.0. The vulnerability is classified as a Cross-site Scripting (XSS) risk, allowing attackers to execute Javascript code through a vulnerable parameter in the password reset page URL.

Understanding CVE-2021-27909

This section delves into the details of the CVE-2021-27909 vulnerability, its impact, technical aspects, and preventive measures.

What is CVE-2021-27909?

CVE-2021-27909 is an XSS vulnerability present in Mautic versions lower than 3.3.4/4.0.0, enabling attackers to execute malicious Javascript by exploiting a vulnerable parameter in the password reset URL.

The Impact of CVE-2021-27909

The vulnerability in question poses a medium severity risk, with a CVSS base score of 6.3. Attackers can leverage this XSS flaw to manipulate user interactions and compromise confidentiality and integrity.

Technical Details of CVE-2021-27909

This section provides insights into the vulnerability's description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The XSS flaw in Mautic's password reset page allows attackers to inject and execute arbitrary Javascript code via a specific URL parameter, 'bundle.' Successful exploitation is contingent upon user interaction with the crafted password reset URL.

Affected Systems and Versions

Mautic versions preceding 3.3.4 and 4.0.0 are vulnerable to this XSS issue. Users operating on these versions are at risk of exploitation by malicious actors leveraging the flaw in the password reset feature.

Exploitation Mechanism

To exploit CVE-2021-27909, attackers must manipulate unsuspecting users into interacting with a specially crafted password reset URL containing the malicious 'bundle' parameter.

Mitigation and Prevention

This section outlines immediate steps to secure systems, long-term security practices, and the significance of regular patching and updates.

Immediate Steps to Take

System administrators should promptly update Mautic instances to versions 3.3.4 or above to mitigate the XSS vulnerability. Additionally, user training and awareness programs can aid in reducing the likelihood of social engineering attacks.

Long-Term Security Practices

Implementing robust input validation mechanisms, conducting regular security audits, and fostering a security-aware culture within the organization can enhance long-term defense against XSS and related threats.

Patching and Updates

Regularly applying software patches and updates released by Mautic is crucial in addressing known security issues, including XSS vulnerabilities. Stay informed about security advisories and act promptly to safeguard systems against emerging threats.