CVE-2021-3780: Peertube Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-f2c5-997w-7f5c
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-3780 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Peertube libraries in the npm ecosystem. The issue involves cross-site scripting in peertube. Remediation is available by upgrading affected packages to version 3.4.0.

CVE-2021-3780 at a Glance

CVE Identifier CVE-2021-3780
GHSA Identifier GHSA-f2c5-997w-7f5c
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Peertube
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-3780

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

peertube fixed: 3.4.0 
npm install peertube@3.4.0
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 peertube

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-3780, inspect your project dependencies using npm:

npm ls peertube

Analyze the terminal output to locate any version of Peertube in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.4.0), your application is affected.

Note: The npm ls peertube 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Peertube, 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

peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). It was found that one could upload a SVG image and then send the url of that to other users and when they open the link we can get their complete session keys as the session keys stored in local storage and with Javascript easily can be stolen by attackers.

CVE-2021-3780 Affected Peertube Versions

1 component(s)
Fixed Versions:
3.4.0
Product / Package Ecosystem Affected Versions Fixed Version
peertube
npm/peertube
npm
< 3.4.0
3.4.0

References

NVD — CVE-2021-3780 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3780
Security Fix Commit FIX COMMIT
https://github.com/chocobozzz/peertube/commit/0ea2f79d45b301fcd660efc894469a99b2239bf6
Peertube Source Repository REPOSITORY
https://github.com/chocobozzz/peertube
huntr.dev/bounties/282807a8-4... WEB
https://huntr.dev/bounties/282807a8-4bf5-4fe2-af62-e05f945b3d65

Frequently Asked Questions

What is CVE-2021-3780?
CVE-2021-3780 is a security vulnerability in Peertube involving Cross-site Scripting in peertube under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Peertube versions are affected?
Affected versions include releases prior to 3.4.0 across affected packages: peertube.
What version fixes CVE-2021-3780?
Upgrading to 3.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is peertube affected?
Yes, peertube is affected in releases prior to 3.4.0. Upgrade your dependency to 3.4.0 or later.
What is the CVSS score of CVE-2021-3780?
CVE-2021-3780 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-3780?
CVE-2021-3780 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for CVE-2021-3780?
Run the dependency tree command: 'npm ls peertube'. 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-f2c5-997w-7f5c",
  "modified" : "2021-09-24T13:07:20Z",
  "published" : "2021-09-20T20:42:41Z",
  "aliases" : [ "CVE-2021-3780" ],
  "summary" : "Cross-site Scripting in peertube",
  "details" : "peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). It was found that one could upload a SVG image and then send the url of that to other users and when they open the link we can get their complete session keys as the session keys stored in local storage and with Javascript easily can be stolen by attackers.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "peertube"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3780"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/chocobozzz/peertube/commit/0ea2f79d45b301fcd660efc894469a99b2239bf6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/chocobozzz/peertube"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/282807a8-4bf5-4fe2-af62-e05f945b3d65"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-16T17:32:58Z",
    "nvd_published_at" : "2021-09-15T12:15:00Z"
  }
}