GHSA-ff5c-938w-8c9q BIT-grafana-2022-35957 CVE-2022-35957 GO-2024-2847
Grafana Escalation from admin to server admin when auth proxy is used
- Severity
- 0.0 / 10
- Medium · CVSS 4.0
- Exploit chance (EPSS)
- 1.63%
- Chance of exploitation in the next 30 days. Higher than 76.27% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-290 Authentication Bypass by Spoofing
- Fix
9.1.6- Upgrade github.com/grafana/grafana to this version or later
Description
Today we are releasing Grafana 9.1.6, 9.0.9, 8.5.13. This patch release includes a Moderate severity security fix for CVE-2022-35957 that affects Grafana instances which are using Grafana Auth Proxy.
Release 9.1.6, latest patch, also containing security fix:
Release 9.0.9, only containing security fix:
Release 8.5.13, only containing security fix:
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 and Azure's Grafana as a service offering.
Privilege escalation (CVE-2022-35957)
Summary
On August 9 an internal security review identified a vulnerability in the Grafana which allows an escalation from Admin privileges to Server Admin when Auth proxy authentication is used.
Auth proxy allows to authenticate a user by only providing the username (or email) in a X-WEBAUTH-USER HTTP header: the trust assumption is that a front proxy will take care of authentication and that Grafana server is publicly reachable only with this front proxy.
Datasource proxy breaks this assumption:
- it is possible to configure a fake datasource pointing to a localhost Grafana install with a
X-WEBAUTH-USERHTTP header containing admin username. - This fake datasource can be called publicly via this proxying feature.
The CVSS score for this vulnerability is 6.6 Moderate (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H).
Impacted versions
All Grafana installations where the Auth Proxy is used.
Solutions and mitigations
To fully address CVE-2022-35957 please upgrade your Grafana instances. They are only required if you are using Auth proxy. If you can’t upgrade, as an alternative, you can deactivate the auth proxy.
Appropriate patches have been applied to Grafana Cloud.
Timeline
Here is a timeline starting from when we originally learned of the issue.
- 2022-08-09: Vulnerability is reported as a result of an Internal security audit.
- 2022-08-09: Release timeline determined: 2022-09-06 for private customer release, 2022-09-20 for public release.
- 2022-08-09: Confirmed that Grafana Cloud is not impacted.
- 2022-09-06: Private release.
- 2022-09-20: Public release.
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
We maintain a security category on our blog, where we will always post a summary, remediation, and mitigation details for any patch containing security fixes.
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Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/grafana/grafana | >= 9.1.0, < 9.1.6 |
9.1.6 |
| github.com/grafana/grafana | >= 9.0.0, < 9.0.9 |
9.0.9 |
| github.com/grafana/grafana | < 8.5.13 |
8.5.13 |
| github.com/grafana/grafana | all versions |
No fix yet |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/grafana/grafana Go → 9.1.6
- go
go get github.com/grafana/grafana@v9.1.6 && go mod tidy
Severity breakdown
CVSS 4.0 0.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Attack vector
- Network
- Attack complexity
- High
- Attack requirements
- None
- Privileges required
- High
- User interaction
- None
- Confidentiality (vulnerable system)
- High
- Integrity (vulnerable system)
- High
- Availability (vulnerable system)
- High
- Confidentiality (subsequent systems)
- None
- Integrity (subsequent systems)
- None
- Availability (subsequent systems)
- None
CVSS 3.1 6.6
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Weakness
CWE-290: Authentication Bypass by Spoofing
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-8pjx-jj86-j47p Grafana path traversal | High Known exploited | Also affects github.com/grafana/grafana |
| CVE-2021-39226 Authentication bypass for viewing and deletions of snapshots | High Known exploited | Also affects github.com/grafana/grafana |
| GHSA-3w66-95m3-8jxg Grafana: Pre-authentication denial of service in the public dashboard query handler | High | Also affects github.com/grafana/grafana |
| GHSA-9g84-39mm-q4p3 Grafana geomap panel's XYZ tile layer has a sanitize-then-interpolate ordering bug | Medium | Also affects github.com/grafana/grafana |
| GHSA-f74p-cwhp-x2wx Grafana Loki datasource plugin's callResource handler contains a path traversal vulnerability. | High | Also affects github.com/grafana/grafana |
| GHSA-9493-h4f5-633x Grafana: Path traversal in the Tempo and Loki data source plugins | Medium | Also affects github.com/grafana/grafana |
| GHSA-wfhv-mj62-f5xh Grafana: Users can generate Service Account tokens after permissions removal | High | Also affects github.com/grafana/grafana |
| GHSA-gxcp-jjxh-rwp4 Grafana: SQL Expressions Read File From Disk | Medium | Also affects github.com/grafana/grafana |
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