CVE-2021-31779: Yoast seo for typo3/yoast seo Server-Side Request Forgery Vulnerability

MODERATE
Advisory Identifier: GHSA-m2q4-qghh-p9cq
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CVSS 6.4
CWE-918
Published
Advisory Summary

CVE-2021-31779 is a MODERATE (CVSS 6.4) server-side request forgery vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Yoast seo for typo3/yoast seo libraries in the Packagist ecosystem. The issue involves server-side request forgery in yoast_seo. Remediation is available by upgrading affected packages to version 7.2.1.

CVE-2021-31779 at a Glance

CVE Identifier CVE-2021-31779
GHSA Identifier GHSA-m2q4-qghh-p9cq
Severity MODERATE
CVSS v3.1 Base Score 6.4
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Yoast seo for typo3/yoast seo
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.4

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

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

How to Fix CVE-2021-31779

To remediate this vulnerability, upgrade all affected Yoast seo for typo3/yoast seo dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

yoast-seo-for-typo3/yoast_seo fixed: 7.2.1 
Upgrade yoast-seo-for-typo3/yoast_seo to 7.2.1
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 yoast-seo-for-typo3/yoast_seo

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-31779, inspect your project dependencies for Yoast seo for typo3/yoast seo:

inspect dependencies for yoast-seo-for-typo3/yoast_seo

Analyze the terminal output to locate any version of Yoast seo for typo3/yoast seo in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.2.1), 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-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 Yoast seo for typo3/yoast seo, 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

The yoast_seo (aka Yoast SEO) extension before 7.2.1 for TYPO3 allows SSRF via a backend user account.

CVE-2021-31779 Affected Yoast seo for typo3/yoast seo Versions

1 component(s)
Fixed Versions:
7.2.1
Product / Package Ecosystem Affected Versions Fixed Version
yoast-seo-for-typo3/yoast_seo
 Packagist
< 7.2.1
7.2.1

References

NVD — CVE-2021-31779 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31779
Yoast seo for typo3/yoast seo Security Information SECURITY
https://typo3.org/security/advisory/typo3-ext-sa-2021-006

Frequently Asked Questions

What is CVE-2021-31779?
CVE-2021-31779 is a security vulnerability in Yoast seo for typo3/yoast seo involving Server-Side Request Forgery in yoast_seo under CWE-918: Server-Side Request Forgery (SSRF).
Which Yoast seo for typo3/yoast seo versions are affected?
Affected versions include releases prior to 7.2.1 across affected packages: yoast-seo-for-typo3/yoast_seo.
What version fixes CVE-2021-31779?
Upgrading to 7.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is yoast-seo-for-typo3/yoast_seo affected?
Yes, yoast-seo-for-typo3/yoast_seo is affected in releases prior to 7.2.1. Upgrade your dependency to 7.2.1 or later.
What is the CVSS score of CVE-2021-31779?
CVE-2021-31779 has a CVSS v3.1 base score of 6.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-31779?
CVE-2021-31779 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 Packagist dependencies for CVE-2021-31779?
Run the dependency tree command: 'inspect dependencies for yoast-seo-for-typo3/yoast_seo'. 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-m2q4-qghh-p9cq",
  "modified" : "2021-05-20T22:39:55Z",
  "published" : "2021-05-21T19:21:38Z",
  "aliases" : [ "CVE-2021-31779" ],
  "summary" : "Server-Side Request Forgery in yoast_seo",
  "details" : "The yoast_seo (aka Yoast SEO) extension before 7.2.1 for TYPO3 allows SSRF via a backend user account.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "yoast-seo-for-typo3/yoast_seo"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "7.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-31779"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-ext-sa-2021-006"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-20T22:39:55Z",
    "nvd_published_at" : "2021-04-28T07:15:00Z"
  }
}