CVE-2020-13964 : Exploit Details and Defense Strategies

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. include/rcmail_output_html.php allows XSS via the username template object.

Understanding CVE-2020-13964

This CVE identifies a cross-site scripting (XSS) vulnerability in Roundcube Webmail versions prior to 1.3.12 and 1.4.5.

What is CVE-2020-13964?

CVE-2020-13964 is a security flaw in Roundcube Webmail that enables attackers to execute malicious scripts in a victim's web browser through the username template object.

The Impact of CVE-2020-13964

The exploitation of this vulnerability could lead to unauthorized access to sensitive information, session hijacking, and potential data manipulation on the affected Roundcube Webmail instances.

Technical Details of CVE-2020-13964

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability exists in the include/rcmail_output_html.php file, allowing attackers to inject and execute malicious scripts via the username template object.

Affected Systems and Versions

Roundcube Webmail versions before 1.3.12
Roundcube Webmail versions before 1.4.5

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a malicious username that contains XSS payloads, which, when rendered in the web interface, execute arbitrary code in the context of the user's session.

Mitigation and Prevention

Protecting systems from CVE-2020-13964 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update Roundcube Webmail to version 1.3.12 or 1.4.5, which contain patches addressing this vulnerability.
Educate users about the risks of clicking on suspicious links or opening attachments in emails.

Long-Term Security Practices

Regularly monitor and audit web applications for security vulnerabilities.
Implement content security policies (CSP) to mitigate the impact of XSS attacks.

Patching and Updates

Stay informed about security updates and patches released by Roundcube Webmail.