CVE-2020-13675: Drupal/core Unrestricted Upload Of File With Vulnerability

CRITICAL
Advisory Identifier: GHSA-v8wr-r69p-mmwx
Share
CVSS 9.8
CWE-284 CWE-434
Published
Advisory Summary

CVE-2020-13675 is a CRITICAL (CVSS 9.8) unrestricted upload of file with vulnerability (CWE-284: Improper Access Control) affecting Drupal/core libraries in the Packagist ecosystem. The issue involves unrestricted upload of file with dangerous type in drupal core. Remediation is available by upgrading affected packages to version 8.9.19, 9.1.13, 9.2.6.

CVE-2020-13675 at a Glance

CVE Identifier CVE-2020-13675
GHSA Identifier GHSA-v8wr-r69p-mmwx
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-284: Improper Access Control
Affected Product Drupal/core
Package Ecosystem Packagist
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-2020-13675

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

drupal/core fixed: 8.9.19 
Upgrade drupal/core to 8.9.19
drupal/core fixed: 9.1.13 
Upgrade drupal/core to 9.1.13
drupal/core fixed: 9.2.6 
Upgrade drupal/core to 9.2.6
Verify Direct and Transitive Dependencies

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

inspect dependencies for drupal/core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-13675, inspect your project dependencies for Drupal/core:

inspect dependencies for drupal/core

Analyze the terminal output to locate any version of Drupal/core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.9.19), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Drupal/core, 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

Drupal's JSON:API and REST/File modules allow file uploads through their HTTP APIs. The modules do not correctly run all file validation, which causes an access bypass vulnerability. An attacker might be able to upload files that bypass the file validation process implemented by modules on the site.

CVE-2020-13675 Affected Drupal/core Versions

3 component(s)
Fixed Versions:
8.9.199.1.139.2.6
Product / Package Ecosystem Affected Versions Fixed Version
drupal/core
 Packagist
≥ 8.0.0
< 8.9.19
8.9.19
drupal/core
 Packagist
≥ 9.1.0
< 9.1.13
9.1.13
drupal/core
 Packagist
≥ 9.2.0
< 9.2.6
9.2.6

References

NVD — CVE-2020-13675 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13675
Drupal/core Source Repository REPOSITORY
https://github.com/drupal/core
www.drupal.org/sa-core-2021-008 WEB
https://www.drupal.org/sa-core-2021-008

Frequently Asked Questions

What is CVE-2020-13675?
CVE-2020-13675 is a security vulnerability in Drupal/core involving Unrestricted Upload of File with Dangerous Type in Drupal core under CWE-284: Improper Access Control.
Which Drupal/core versions are affected?
Affected versions include releases prior to 8.9.19, 9.1.13, 9.2.6 across affected packages: drupal/core.
What version fixes CVE-2020-13675?
Upgrading to 8.9.19, 9.1.13, 9.2.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is drupal/core affected?
Yes, drupal/core is affected in releases prior to 8.9.19, 9.1.13, 9.2.6. Upgrade your dependency to 8.9.19, 9.1.13, 9.2.6 or later.
What is the CVSS score of CVE-2020-13675?
CVE-2020-13675 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-2020-13675?
CVE-2020-13675 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Packagist dependencies for CVE-2020-13675?
Run the dependency tree command: 'inspect dependencies for drupal/core'. 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-v8wr-r69p-mmwx",
  "modified" : "2022-02-23T19:14:17Z",
  "published" : "2022-02-12T00:00:47Z",
  "aliases" : [ "CVE-2020-13675" ],
  "summary" : "Unrestricted Upload of File with Dangerous Type in Drupal core",
  "details" : "Drupal's JSON:API and REST/File modules allow file uploads through their HTTP APIs. The modules do not correctly run all file validation, which causes an access bypass vulnerability. An attacker might be able to upload files that bypass the file validation process implemented by modules on the site.",
  "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" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.0.0"
      }, {
        "fixed" : "8.9.19"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.1.0"
      }, {
        "fixed" : "9.1.13"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "9.2.0"
      }, {
        "fixed" : "9.2.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-13675"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/drupal/core"
  }, {
    "type" : "WEB",
    "url" : "https://www.drupal.org/sa-core-2021-008"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284", "CWE-434" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-02-23T19:14:17Z",
    "nvd_published_at" : "2022-02-11T16:15:00Z"
  }
}