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CVE-2021-41174— XSS vulnerability allowing arbitrary JavaScript execution

Quick assessment

Affected
grafana grafana
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grafana是Grafana实验室的一套提供可视化监控界面的开源监控工具。该工具主要用于监控和分析Graphite、InfluxDB和Prometheus等。 Grafana 存在跨站脚本漏洞，该漏洞源于没有对 URL 进行验证，导致 AngularJS 渲染引擎执行 URL 中包含的 JavaScript 表达式。

CVSS 6.9 · Medium EPSS 84.61% · P100

Public Exploits 1

Nuclei · 1 CVE-2021-41174.yaml [template]
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I. Basic Information for CVE-2021-41174

Vulnerability Information
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Vulnerability Title
XSS vulnerability allowing arbitrary JavaScript execution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
grafana 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana是Grafana实验室的一套提供可视化监控界面的开源监控工具。该工具主要用于监控和分析Graphite、InfluxDB和Prometheus等。 Grafana 存在跨站脚本漏洞，该漏洞源于没有对 URL 进行验证，导致 AngularJS 渲染引擎执行 URL 中包含的 JavaScript 表达式。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
grafana grafana >= 8.0.0, < 8.2.3 -

II. Public POCs for CVE-2021-41174

# POC Description Source Link Shenlong Link
1 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. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-41174.yaml POC Details
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III. Intelligence Information for CVE-2021-41174

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Patches & Fixes for CVE-2021-41174 (2)

Vendor Advisories for CVE-2021-41174 (2)

IV. Related Vulnerabilities

Same product: grafana
Same vendor: grafana
Same weakness: CWE-79

V. Comments for CVE-2021-41174

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