CVE-2020-27664: Strapi Authorization Bypass Vulnerability

CRITICAL
Advisory Identifier: GHSA-7frv-9phw-vrvr
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CVSS 9.8
CWE-862
Published
Advisory Summary

CVE-2020-27664 is a CRITICAL (CVSS 9.8) authorization bypass vulnerability (CWE-862: Missing Authorization) affecting Strapi libraries in the npm ecosystem. The issue involves authorization bypass in strapi. Remediation is available by upgrading affected packages to version 3.2.5.

CVE-2020-27664 at a Glance

CVE Identifier CVE-2020-27664
GHSA Identifier GHSA-7frv-9phw-vrvr
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-862: Missing Authorization
Affected Product Strapi
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:N/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2020-27664

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

strapi fixed: 3.2.5 
npm install strapi@3.2.5
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 strapi

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-27664, inspect your project dependencies using npm:

npm ls strapi

Analyze the terminal output to locate any version of Strapi in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.2.5), your application is affected.

Note: The npm ls strapi 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-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In Strapi, 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

`admin/src/containers/InputModalStepperProvider/index.js` in Strapi before 3.2.5 has unwanted `/proxy?url=` functionality.

CVE-2020-27664 Affected Strapi Versions

1 component(s)
Fixed Versions:
3.2.5
Product / Package Ecosystem Affected Versions Fixed Version
strapi
npm/strapi
npm
< 3.2.5
3.2.5

References

NVD — CVE-2020-27664 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27664
Strapi Source Repository REPOSITORY
https://github.com/strapi/strapi/pull/8442
Strapi Release RELEASE
https://github.com/strapi/strapi/releases/tag/v3.2.5

Frequently Asked Questions

What is CVE-2020-27664?
CVE-2020-27664 is a security vulnerability in Strapi involving Authorization bypass in Strapi under CWE-862: Missing Authorization.
Which Strapi versions are affected?
Affected versions include releases prior to 3.2.5 across affected packages: strapi.
What version fixes CVE-2020-27664?
Upgrading to 3.2.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is strapi affected?
Yes, strapi is affected in releases prior to 3.2.5. Upgrade your dependency to 3.2.5 or later.
What is the CVSS score of CVE-2020-27664?
CVE-2020-27664 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-27664?
CVE-2020-27664 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check npm dependencies for CVE-2020-27664?
Run the dependency tree command: 'npm ls strapi'. 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-7frv-9phw-vrvr",
  "modified" : "2023-09-13T19:20:18Z",
  "published" : "2021-05-10T18:43:59Z",
  "aliases" : [ "CVE-2020-27664" ],
  "summary" : "Authorization bypass in Strapi",
  "details" : "`admin/src/containers/InputModalStepperProvider/index.js` in Strapi before 3.2.5 has unwanted `/proxy?url=` functionality.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "strapi"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.2.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-27664"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/strapi/strapi/pull/8442"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/strapi/strapi/releases/tag/v3.2.5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-21T18:06:14Z",
    "nvd_published_at" : "2020-10-22T19:15:00Z"
  }
}