CVE-2021-39205 : What You Need to Know

Jitsi Meet, an open-source video conferencing application, has a vulnerability allowing client-side cross-site scripting pre-version 2.0.6173, impacting integrity and confidentiality.

Understanding CVE-2021-39205

This CVE involves DOM-based XSS/Content Spoofing via Prototype Pollution.

What is CVE-2021-39205?

Jitsi Meet versions before 2.0.6173 are susceptible to client-side cross-site scripting through unescaped JSON object property injection.
The vulnerability poses a medium severity risk with a CVSS base score of 6.8.

The Impact of CVE-2021-39205

Attack Vector: Network
Attack Complexity: High
User Interaction: Required
Confidentiality Impact: High
Integrity Impact: High
Scope: Unchanged
Privileges Required: None
Availability Impact: None
No known incidents of exploitation have been reported.

Technical Details of CVE-2021-39205

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The issue arises from improper input neutralization and controlled modification of object prototype attributes.
Versions prior to 2.0.6173 are at risk.

Affected Systems and Versions

Affected Product: Jitsi Meet
Vendor: Jitsi
Vulnerable Versions: < 2.0.6173

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting properties into JSON objects without proper escaping, leading to client-side cross-site scripting.

Mitigation and Prevention

Understanding how to mitigate and prevent the CVE is crucial.

Immediate Steps to Take

Upgrade Jitsi Meet to version 2.0.6173 or higher to eliminate the vulnerability.

Long-Term Security Practices

Regularly update software to the latest versions to patch known security issues.

Patching and Updates

Apply security patches and updates promptly to maintain secure software.