CVE-2023-3128 : Security Advisory and Response

This CVE-2023-3128 impacts Grafana and Grafana Enterprise versions less than 9.5.4, 9.4.13, 9.3.16, 9.2.20, and 8.5.27. It was published on June 22, 2023, by GRAFANA.

Understanding CVE-2023-3128

This vulnerability affects how Grafana validates Azure AD accounts, specifically related to the email claim. Exploiting this issue could lead to account takeover and authentication bypass in Azure AD OAuth configurations with multi-tenant apps.

What is CVE-2023-3128?

Grafana relies on the email claim for Azure AD account validation. However, Azure AD's profile email field is not unique and can be easily altered. This weakness can be exploited to compromise accounts and bypass authentication controls.

The Impact of CVE-2023-3128

The impact of this vulnerability is significant, with a CVSSv3.1 base score of 9.4 (Critical). It has a high impact on confidentiality and integrity, with low availability impact. The attack complexity is low, and no special privileges are required.

Technical Details of CVE-2023-3128

The vulnerability identified as CWE-290 affects Grafana and Grafana Enterprise versions mentioned earlier. The impact scenario is considered general. The exploit can be initiated remotely with no user interaction required.

Vulnerability Description

Grafana incorrectly validates Azure AD accounts based on the non-unique and modifiable email claim, leading to severe security implications like account takeover and authentication bypass.

Affected Systems and Versions

Versions of Grafana and Grafana Enterprise prior to 9.5.4, 9.4.13, 9.3.16, 9.2.20, and 8.5.27 are affected by CVE-2023-3128, especially when utilizing Azure AD OAuth with multi-tenant apps.

Exploitation Mechanism

The vulnerability can be exploited by manipulating the email claim in Azure AD profiles, allowing attackers to potentially take over accounts and bypass authentication mechanisms.

Mitigation and Prevention

To address CVE-2023-3128, immediate action is crucial to mitigate the risks associated with this vulnerability in Grafana and Grafana Enterprise instances.

Immediate Steps to Take

Update affected Grafana and Grafana Enterprise versions to 9.5.4 or newer.
Review and secure Azure AD OAuth configurations to minimize the risk of account compromise.
Monitor account activities for suspicious behavior related to unauthorized access.

Long-Term Security Practices

Implement multi-factor authentication to enhance security controls for account access.
Regularly audit and review access controls and permissions within Grafana systems.
Stay informed about security advisories and updates from Grafana to address future vulnerabilities proactively.

Patching and Updates

Ensure that Grafana and Grafana Enterprise are kept up to date with the latest security patches to mitigate known vulnerabilities and enhance overall system security.