CVE-2021-39226
Description
An authentication bypass was found in grafana. An attacker on the network is able to view and delete snapshots by accessing a literal path.
Statement
In OpenShift Container Platform (OCP), Red Hat Advanced Cluster Management for Kubernetes (RHACM), and OpenShift ServiceMesh (OSSM) the grafana components are protected by OpenShift OAuth that reduces the impact of this flaw to Moderate. Access to the grafana panel where snapshots can be created requires admin permissions. Additionally snapshots by default are not available to unauthenticated users and don't contain sensitive data.
Since snapshots by default are not available to unauthenticated users and don't contain sensitive data, impact has been lowered for Red Hat Gluster Storage 3.
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 | 7.3 | 7.3 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | Low | N/A |
| Integrity Impact | Low | Low | N/A |
| Availability Impact | Low | Low | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Red Hat CVSS v3 Score Explanation
We believe the impact to confidentiality, integrity and availability to be low because when you create a dashboard snapshot, there is a message similar to below:
"A snapshot is an instant way to share an interactive dashboard publicly. When created, we strip sensitive data like queries (metric, template and annotation) and panel links, leaving only the visible metric data and series names embedded into your dashboard." which suggests the data is stripped.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Access control checks for specific user data or functionality can be bypassed.
Access Control
Technical Impact: Gain Privileges or Assume Identity
Horizontal escalation of privilege is possible (one user can view/modify information of another user).
Access Control
Technical Impact: Gain Privileges or Assume Identity
Vertical escalation of privilege is possible if the user-controlled key is actually a flag that indicates administrator status, allowing the attacker to gain administrative access.
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