CVE-2020-8902: Rendertron SSRF Vulnerability

MODERATE
Advisory Identifier: GHSA-xr9h-9m79-x29g
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CWE-918
Published
Advisory Summary

CVE-2020-8902 is a MODERATE ssrf vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Rendertron libraries in the npm ecosystem. The issue involves ssrf in rendertron. Remediation is available by upgrading affected packages to version 3.0.0.

CVE-2020-8902 at a Glance

CVE Identifier CVE-2020-8902
GHSA Identifier GHSA-xr9h-9m79-x29g
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Rendertron
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2020-8902

To remediate this vulnerability, upgrade all affected Rendertron dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

rendertron fixed: 3.0.0 
npm install rendertron@3.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls rendertron

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-8902, inspect your project dependencies using npm:

npm ls rendertron

Analyze the terminal output to locate any version of Rendertron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.0), your application is affected.

Note: The npm ls rendertron command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Rendertron, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Rendertron versions prior to 3.0.0 are are susceptible to a Server-Side Request Forgery (SSRF) attack. An attacker can use a specially crafted webpage to force a rendertron headless chrome process to render internal sites it has access to, and display it as a screenshot. Suggested mitigations are to upgrade your rendertron to version 3.0.0, or, if you cannot update, to secure the infrastructure to limit the headless chrome's access to your internal domain.

CVE-2020-8902 Affected Rendertron Versions

1 component(s)
Fixed Versions:
3.0.0
Product / Package Ecosystem Affected Versions Fixed Version
rendertron
npm/rendertron
npm
< 3.0.0
3.0.0

References

NVD — CVE-2020-8902 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8902
Rendertron Release RELEASE
https://github.com/GoogleChrome/rendertron/releases/tag/3.0.0
www.npmjs.com/package/rendertron WEB
https://www.npmjs.com/package/rendertron

Frequently Asked Questions

What is CVE-2020-8902?
CVE-2020-8902 is a security vulnerability in Rendertron involving SSRF in Rendertron under CWE-918: Server-Side Request Forgery (SSRF).
Which Rendertron versions are affected?
Affected versions include releases prior to 3.0.0 across affected packages: rendertron.
What version fixes CVE-2020-8902?
Upgrading to 3.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is rendertron affected?
Yes, rendertron is affected in releases prior to 3.0.0. Upgrade your dependency to 3.0.0 or later.
What CWE is associated with CVE-2020-8902?
CVE-2020-8902 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check npm dependencies for CVE-2020-8902?
Run the dependency tree command: 'npm ls rendertron'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xr9h-9m79-x29g",
  "modified" : "2021-02-24T06:59:10Z",
  "published" : "2021-03-01T19:38:23Z",
  "aliases" : [ "CVE-2020-8902" ],
  "summary" : "SSRF in Rendertron",
  "details" : "Rendertron versions prior to 3.0.0 are are susceptible to a Server-Side Request Forgery (SSRF) attack. An attacker can use a specially crafted webpage to force a rendertron headless chrome process to render internal sites it has access to, and display it as a screenshot. Suggested mitigations are to upgrade your rendertron to version 3.0.0, or, if you cannot update, to secure the infrastructure to limit the headless chrome's access to your internal domain.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "rendertron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-8902"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/GoogleChrome/rendertron/releases/tag/3.0.0"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/rendertron"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-02-24T06:59:10Z",
    "nvd_published_at" : "2021-02-23T12:15:00Z"
  }
}