CVE-2022-31107: Grafana account takeover via OAuth vulnerability

Grafana is an open-source platform for monitoring and observability. In versions 5.3 until 9.0.3, 8.5.9, 8.4.10, and 8.3.10, it is possible for a malicious user who has authorization to log into a Grafana instance via a configured OAuth IdP which provides a login name to take over the account of another user in that Grafana instance. This can occur when the malicious user is authorized to log in to Grafana via OAuth, the malicious user's external user id is not already associated with an account in Grafana, the malicious user's email address is not already associated with an account in Grafana, and the malicious user knows the Grafana username of the target user. If these conditions are met, the malicious user can set their username in the OAuth provider to that of the target user, then go through the OAuth flow to log in to Grafana. Due to the way that external and internal user accounts are linked together during login, if the conditions above are all met then the malicious user will be able to log in to the target user's Grafana account. Versions 9.0.3, 8.5.9, 8.4.10, and 8.3.10 contain a patch for this issue. As a workaround, concerned users can disable OAuth login to their Grafana instance, or ensure that all users authorized to log in via OAuth have a corresponding user account in Grafana linked to their email address.

It is possible for a malicious user who has the authorization to log into a grafana instance via an OAuth integration which provides a login name to take over the account of another user in that Grafana instance provided the following criteria are met: - the malicious user is authorized to log in to Grafana via OAuth - the malicious user's external user id is not already associated with an account in Grafana - the malicious user's email address is not already associated with an account in Grafana - the malicious user knows the Grafana username or email of the target user

— Red Hat

Today we are releasing Grafana 8.3.10, 8.4.10, 8.5.9 and 9.0.3. This patch release includes a HIGH severity security fix for an Oauth takeover vulnerability in Grafana.

Release v.9.0.3, containing this security fix and other patches:

- Download Grafana 9.0.3 - Release notes

Release v.8.5.9, containing this security fix and other fixes:

- Download Grafana 8.5.9 - Release notes

Release v.8.4.10, containing this security fix and other fixes:

- Download Grafana 8.4.10 - Release notes

Release v.8.3.10, containing this security fix and other fixes:

- Download Grafana 8.3.10

Grafana account takeover via OAuth vulnerability (CVE-2022-31107)

Summary On June 27 the HTTPVoid team contacted Grafana Labs to disclose a Grafana account takeover via an OAuth vulnerability.

We believe that this vulnerability is rated at CVSS 7.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L).

Impact It is possible for a malicious user who has authorization to log into a Grafana instance via a configured OAuth IdP to take over an existing Grafana account under some conditions.

Affected versions with HIGH severity All Grafana >=5.3 versions are affected by this vulnerability.

Solutions and mitigations

All installations after Grafana v5.3 should be upgraded as soon as possible.

As a workaround it is possible to disable any OAuth login or ensure that all users authorized to log in via OAuth have a corresponding user account in Grafana linked to their email address.

Appropriate patches have been applied to Grafana Cloud and as always, we closely coordinated with all cloud providers licensed to offer Grafana Pro. They have received early notification under embargo and confirmed that their offerings are secure at the time of this announcement. This is applicable to Amazon Managed Grafana.

Timeline

Here is a detailed timeline starting from when we originally learned of the issue. All times in UTC.

2022-06-27 19:00 - Research submission of vulnerability report 2022-06-27 20:53 - Issue triaged, confirmed positive, and internal incident raised 2022-06-28 08:42 - Fix PR submitted and reviewed 2022-06-28 20:58 - All Grafana Cloud hosted Grafana instances patched 2022-07-05 07:14 - Customers informed under embargo 2022-07-14 02:00 - Public release

Acknowledgement

We would like to thank the HTTPVoid team for responsibly disclosing the vulnerability.

Reporting security issues

If you think you have found a security vulnerability, please send a report to security@grafana.com. This address can be used for all of Grafana Labs' open source and commercial products (including, but not limited to Grafana, Grafana Cloud, Grafana Enterprise, and grafana.com). We can accept only vulnerability reports at this address. We would prefer that you encrypt your message to us by using our PGP key. The key fingerprint is

F988 7BEA 027A 049F AE8E 5CAA D125 8932 BE24 C5CA

The key is available from keyserver.ubuntu.com.

Security announcements

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— GitHub