CVE-2021-36383 : Security Advisory and Response

Xen Orchestra (with xo-web through 5.80.0 and xo-server through 5.84.0) mishandles authorization, allowing an attacker to modify WebSocket data to gain unauthorized access to various data sets such as VMs, Backups, Audit, Users, and Groups.

Understanding CVE-2021-36383

This section provides insight into the impact, technical details, and mitigation strategies related to CVE-2021-36383.

What is CVE-2021-36383?

CVE-2021-36383 pertains to a vulnerability in Xen Orchestra, specifically in xo-web versions up to 5.80.0, and xo-server versions up to 5.84.0. The issue arises from mishandling of authorization, enabling an attacker to escalate privileges by modifying WebSocket data.

The Impact of CVE-2021-36383

Exploiting this vulnerability allows an unauthorized user to elevate their permissions within Xen Orchestra. By changing the permission field from none to admin, the attacker can access sensitive data sets like VMs, Backups, Audit logs, User information, and Group details.

Technical Details of CVE-2021-36383

Explore the specifics of the vulnerability, including the description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability in Xen Orchestra arises from improper handling of authorization mechanisms. Attackers can manipulate WebSocket data to switch permissions and gain elevated access within the system.

Affected Systems and Versions

Xen Orchestra versions up to xo-web 5.80.0 and xo-server 5.84.0 are affected by this vulnerability. Users utilizing these versions are at risk of unauthorized privilege escalation.

Exploitation Mechanism

By modifying WebSocket data to change the permission field from none to admin, threat actors can exploit this vulnerability to gain unauthorized access to sensitive data.

Mitigation and Prevention

Learn how to mitigate the risks posed by CVE-2021-36383 and prevent potential security breaches.

Immediate Steps to Take

Users should immediately update Xen Orchestra to versions beyond xo-web 5.80.0 and xo-server 5.84.0 to mitigate the vulnerability. Additionally, restrict network access to critical systems and monitor for any unusual activities or unauthorized access attempts.

Long-Term Security Practices

In the long term, organizations should prioritize regular security audits, implement strong authentication mechanisms, and provide security awareness training to prevent similar exploits in the future.

Patching and Updates

Stay informed about security updates for Xen Orchestra and promptly apply patches released by the vendor to address known vulnerabilities.