CVE-2019-15043
Description
From CVE.org
In Grafana 2.x through 6.x before 6.3.4, parts of the HTTP API allow unauthenticated use. This makes it possible to run a denial of service attack against the server running Grafana.
Statement
OpenShift Container Platform secures all usages of Grafana behind the oauth-proxy, preventing access to Grafana without authentication. Red Hat Product Security have rated this vulnerability as Low for OpenShift Container Platform. This issue affects the version of Grafana as shipped with Red Hat Gluster Storage 3 and Red Hat Ceph Storage 3, as it contains the vulnerable snapshot functionality.
Mitigation
Block access to the snapshot feature by blocking the /api/snapshots
URL via a web application firewall, load balancer, reverse proxy etc.
You can also set 'external_enabled' to false to disable external
snapshot publish endpoint (default true). Note, it will completely
disable this feature.
# cat /etc/grafana/grafana.ini
[...]
[snapshots]
# snapshot sharing options
external_enabled = false
external_snapshot_url = https://snapshots-origin.raintank.io
external_snapshot_name = Publish to snapshot.raintank.io
[...]
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.3 | 7.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | Low | High | N/A |
Vector
Red Hat: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Acknowledgements
Red Hat would like to thank the Grafana team for reporting this issue.
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