Access policy with access to all tenants and using label selectors has more access
A vulnerability in the label-based access control of Grafana Labs Grafana Enterprise Metrics allows an attacker more access than intended. If an access policy which has label selector restrictions also has been granted access to all tenants in the system, the label selector restrictions will not be applied when using this policy with the affected versions of the software. This issue affects: Grafana Labs Grafana Enterprise Metrics GEM 1.X versions prior to 1.7.1 on AMD64; GEM 2.X versions prior to 2.3.1 on AMD64.
Upgrade to 1.7.1 and higher in 1.X line, and 2.3.1 and higher in 2.X line
Configurations
Workarounds
If upgrading is not possible, discontinue use of access policies with label selector restrictions.
Exploits
In Grafana Enterprise Metrics, after creating an Access Policy which is granted access to all tenants as well as specified a specific label matcher, the label matcher is erroneously not propagated to queries performed with this access policy, so more access is granted to the policy than intended.