Vulnerability · Published Nov 3, 2021 · Assigned by GitHub_M
CVE-2021-41174XSS vulnerability allowing arbitrary JavaScript execution
Medium 6.9
In plain English
A medium-severity cross-site scripting in grafana from grafana. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 85.4% (higher than 99.7% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei. Fixed versions are available - upgrade the affected package.
Official description
Grafana is an open-source platform for monitoring and observability. In affected versions if an attacker is able to convince a victim to visit a URL referencing a vulnerable page, arbitrary JavaScript content may be executed within the context of the victim's browser. The user visiting the malicious link must be unauthenticated and the link must be for a page that contains the login button in the menu bar. The url has to be crafted to exploit AngularJS rendering and contain the interpolation binding for AngularJS expressions. AngularJS uses double curly braces for interpolation binding: {{ }} ex: {{constructor.constructor(‘alert(1)’)()}}. When the user follows the link and the page renders, the login button will contain the original link with a query parameter to force a redirect to the login page. The URL is not validated and the AngularJS rendering engine will execute the JavaScript expression contained in the URL. Users are advised to upgrade as soon as possible. If for some reason you cannot upgrade, you can use a reverse proxy or similar to block access to block the literal string {{ in the path.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @grafana/data | 8.2.3 | GHSA-3j9m-hcv9-rpj8 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
References
- https://github.com/grafana/grafana/security/advisories/GHSA-3j9m-hcv9-rpj8 x_refsource_CONFIRM
- https://github.com/grafana/grafana/commit/31b78d51c693d828720a5b285107a50e6024c912 x_refsource_MISC
- https://github.com/grafana/grafana/commit/3cb5214fa45eb5a571fd70d6c6edf0d729983f82 x_refsource_MISC
- https://github.com/grafana/grafana/commit/fb85ed691290d211a5baa44d9a641ab137f0de88 x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20211125-0003/ x_refsource_CONFIRM