CVE-2020-11737 : Vulnerability Insights and Analysis

A cross-site scripting (XSS) vulnerability in Web Client in Zimbra 9.0 allows a remote attacker to craft links in an E-Mail message or calendar invite to execute arbitrary JavaScript. This is fixed in 9.0.0 Patch 2.

Understanding CVE-2020-11737

This CVE involves a critical XSS vulnerability in Zimbra 9.0 that could be exploited by attackers to execute malicious JavaScript code.

What is CVE-2020-11737?

CVE-2020-11737 is a cross-site scripting (XSS) vulnerability in Zimbra 9.0 that enables remote attackers to inject and execute arbitrary JavaScript code through crafted links in email messages or calendar invites.

The Impact of CVE-2020-11737

The exploitation of this vulnerability could lead to unauthorized access, data theft, and potential compromise of the affected systems. Attackers could manipulate user interactions and perform various malicious actions.

Technical Details of CVE-2020-11737

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

Vulnerability Description

The vulnerability in Zimbra 9.0 allows attackers to embed JavaScript code within email links or calendar invites, exploiting the Web Client's XSS weakness.

Affected Systems and Versions

Product: Zimbra 9.0
Vendor: Zimbra
Versions: All versions of Zimbra 9.0 are affected.

Exploitation Mechanism

The attack requires crafting links with specific attributes, including an 'href' attribute with a "www" substring followed by a DOM event listener like 'onmouseover'.

Mitigation and Prevention

Protecting systems from CVE-2020-11737 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply the 9.0.0 Patch 2 to mitigate the vulnerability.
Educate users about the risks of clicking on suspicious links in emails or calendar invites.

Long-Term Security Practices

Regularly update and patch Zimbra software to address security vulnerabilities promptly.
Implement content security policies to prevent XSS attacks and sanitize user inputs.

Patching and Updates

Ensure that all systems running Zimbra 9.0 are updated to version 9.0.0 Patch 2 to eliminate the XSS vulnerability.