CVE-2021-21015: Magento/community edition Magento OS Command Injection Vulnerability

HIGH
Advisory Identifier: GHSA-w2p4-2c8c-2g7h
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CVSS 8.0
CWE-78
Published
Advisory Summary

CVE-2021-21015 is a HIGH (CVSS 8.0) magento os command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Magento/community edition libraries in the Packagist ecosystem. The issue involves magento os command injection via the customer attribute save controller. Remediation is available by upgrading affected packages to version 2.3.6-p1, 2.4.2.

CVE-2021-21015 at a Glance

CVE Identifier CVE-2021-21015
GHSA Identifier GHSA-w2p4-2c8c-2g7h
Severity HIGH
CVSS v3.1 Base Score 8.0
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Magento/community edition
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.0

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

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

How to Fix CVE-2021-21015

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

magento/community-edition fixed: 2.3.6-p1 
Upgrade magento/community-edition to 2.3.6-p1
magento/community-edition fixed: 2.4.2 
Upgrade magento/community-edition to 2.4.2
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 magento/community-edition

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-21015, inspect your project dependencies for Magento/community edition:

inspect dependencies for magento/community-edition

Analyze the terminal output to locate any version of Magento/community edition in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.6-p1), 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-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Magento/community edition, 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

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to an OS command injection via the customer attribute save controller. Successful exploitation could lead to arbitrary code execution by an authenticated attacker. Access to the admin console is required for successful exploitation.

CVE-2021-21015 Affected Magento/community edition Versions

2 component(s)
Fixed Versions:
2.3.6-p12.4.2
Product / Package Ecosystem Affected Versions Fixed Version
magento/community-edition
 Packagist
< 2.3.6-p1
2.3.6-p1
magento/community-edition
 Packagist
≥ 2.4.0
< 2.4.2
2.4.2

References

NVD — CVE-2021-21015 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21015
Security Fix Commit FIX COMMIT
https://github.com/magento/magento2/commit/a2eb7e29ea92a8bbc86c3b6b81b59d8533088497
Security Fix Commit FIX COMMIT
https://github.com/magento/magento2/commit/a349e022c9ae070e7da262021f9ef182105aa00b
Magento/community edition Source Repository REPOSITORY
https://github.com/magento/magento2
Magento/community edition Security Information SECURITY
https://helpx.adobe.com/security/products/magento/apsb21-08.html

Frequently Asked Questions

What is CVE-2021-21015?
CVE-2021-21015 is a security vulnerability in Magento/community edition involving Magento OS command injection via the customer attribute save controller under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Magento/community edition versions are affected?
Affected versions include releases prior to 2.3.6-p1, 2.4.2 across affected packages: magento/community-edition.
What version fixes CVE-2021-21015?
Upgrading to 2.3.6-p1, 2.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is magento/community-edition affected?
Yes, magento/community-edition is affected in releases prior to 2.3.6-p1, 2.4.2. Upgrade your dependency to 2.3.6-p1, 2.4.2 or later.
What is the CVSS score of CVE-2021-21015?
CVE-2021-21015 has a CVSS v3.1 base score of 8.0 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2021-21015?
CVE-2021-21015 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check Packagist dependencies for CVE-2021-21015?
Run the dependency tree command: 'inspect dependencies for magento/community-edition'. 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-w2p4-2c8c-2g7h",
  "modified" : "2024-01-11T19:29:24Z",
  "published" : "2022-05-24T17:41:54Z",
  "aliases" : [ "CVE-2021-21015" ],
  "summary" : "Magento OS command injection via the customer attribute save controller",
  "details" : "Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to an OS command injection via the customer attribute save controller. Successful exploitation could lead to arbitrary code execution by an authenticated attacker. Access to the admin console is required for successful exploitation.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "magento/community-edition"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.6-p1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "magento/community-edition"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.4.0"
      }, {
        "fixed" : "2.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21015"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/magento/magento2/commit/a2eb7e29ea92a8bbc86c3b6b81b59d8533088497"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/magento/magento2/commit/a349e022c9ae070e7da262021f9ef182105aa00b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/magento/magento2"
  }, {
    "type" : "WEB",
    "url" : "https://helpx.adobe.com/security/products/magento/apsb21-08.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-78" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-11T19:29:24Z",
    "nvd_published_at" : "2021-02-11T20:15:00Z"
  }
}