CVE-2022-31168 : Security Advisory and Response

Zulip Server insufficient authorization for changing bot roles

Understanding CVE-2022-31168

Zulip Server experienced a vulnerability in version 5.4 and earlier that allowed a member of an organization to manipulate an API call to grant organization administrator privileges to one of their bots. This vulnerability was addressed in Zulip Server 5.5.

What is CVE-2022-31168?

The CVE-2022-31168, also known as 'Zulip Server insufficient authorization for changing bot roles,' occurred due to an incorrect authorization check in Zulip Server versions prior to 5.5. This flaw enabled a member of an organization to execute an API call that could assign organization administrator privileges to their bots.

The Impact of CVE-2022-31168

The vulnerability could potentially lead to unauthorized access and manipulation of organization administrator privileges, posing a security risk to the affected systems. However, members without ownership or permission to create bots were unable to exploit this vulnerability.

Technical Details of CVE-2022-31168

This section provides more insight into the technical aspects of the CVE, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

Zulip Server 5.4 and earlier versions contained an incorrect authorization check, allowing unauthorized privilege escalation for bot roles within organizations.

Affected Systems and Versions

The vulnerability impacted Zulip Server versions prior to 5.5, specifically version 5.4 and earlier.

Exploitation Mechanism

By crafting a specific API call, a member of an organization could exploit the vulnerability to assign organization administrator privileges to their bots.

Mitigation and Prevention

To secure systems against CVE-2022-31168 and prevent potential exploitation, organizations should take immediate steps, implement long-term security practices, and apply necessary patches and updates.

Immediate Steps to Take

Organizations are advised to update their Zulip Server to version 5.5 or later to mitigate the vulnerability. Additionally, administrators can restrict 'Who can create bots' permission to administrators only and adjust bot ownership.

Long-Term Security Practices

Implementing robust authorization controls, conducting regular security assessments, and monitoring for unauthorized activities can enhance the overall security posture and prevent similar incidents.

Patching and Updates

It is crucial to stay informed about security updates and promptly apply patches released by Zulip to address known vulnerabilities.