CVE-2017-6820 : What You Need to Know

An XSS vulnerability exists in rcube_utils.php within Roundcube versions prior to 1.1.8 and 1.2.x before 1.2.4, allowing exploitation through a specially crafted CSS token sequence within an SVG element.

Understanding CVE-2017-6820

This CVE involves a cross-site scripting vulnerability in Roundcube's rcube_utils.php file.

What is CVE-2017-6820?

This CVE identifies a security flaw in Roundcube versions before 1.1.8 and 1.2.4, enabling attackers to execute cross-site scripting attacks using manipulated CSS tokens within SVG elements.

The Impact of CVE-2017-6820

The vulnerability could lead to unauthorized access, data theft, and potential compromise of user information on affected systems.

Technical Details of CVE-2017-6820

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability in rcube_utils.php allows for cross-site scripting attacks by inserting malicious CSS token sequences within SVG elements.

Affected Systems and Versions

Roundcube versions prior to 1.1.8
Roundcube 1.2.x before 1.2.4

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting a specifically crafted CSS token sequence within an SVG element to execute cross-site scripting attacks.

Mitigation and Prevention

Protective measures to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update Roundcube to version 1.1.8 or 1.2.4 to mitigate the vulnerability.
Implement content security policies to restrict the execution of unauthorized scripts.
Regularly monitor and audit web application code for security vulnerabilities.

Long-Term Security Practices

Conduct regular security training for developers to raise awareness of secure coding practices.
Employ web application firewalls to filter and block malicious traffic targeting XSS vulnerabilities.
Stay informed about security updates and patches released by Roundcube.

Patching and Updates

Apply patches and updates provided by Roundcube promptly to address security vulnerabilities and enhance system security.