CVE-2020-9757: Nystudio107/craft seomatic SEOmatic For CraftCMS Allows Server-Side Vulnerability

CRITICAL
Advisory Identifier: GHSA-6q4j-8pjm-5mgc
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CVSS 9.8
CWE-74
Published
Advisory Summary

CVE-2020-9757 is a CRITICAL (CVSS 9.8) seomatic for craftcms allows server-side vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) affecting Nystudio107/craft seomatic libraries in the Packagist ecosystem. The issue involves seomatic for craftcms allows server-side template injection. Remediation is available by upgrading affected packages to version 3.3.0.

CVE-2020-9757 at a Glance

CVE Identifier CVE-2020-9757
GHSA Identifier GHSA-6q4j-8pjm-5mgc
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Product Nystudio107/craft seomatic
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-2020-9757

To remediate this vulnerability, upgrade all affected Nystudio107/craft seomatic dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

nystudio107/craft-seomatic fixed: 3.3.0 
Upgrade nystudio107/craft-seomatic to 3.3.0
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 nystudio107/craft-seomatic

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-9757, inspect your project dependencies for Nystudio107/craft seomatic:

inspect dependencies for nystudio107/craft-seomatic

Analyze the terminal output to locate any version of Nystudio107/craft seomatic in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.3.0), 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-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), where the product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. In Nystudio107/craft seomatic, 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 Seomatic component before 3.2.46 for Craft CMS allows Server-Side Template Injection and information disclosure via malformed data to the metacontainers controller.

CVE-2020-9757 Affected Nystudio107/craft seomatic Versions

1 component(s)
Fixed Versions:
3.3.0
Product / Package Ecosystem Affected Versions Fixed Version
nystudio107/craft-seomatic
 Packagist
< 3.3.0
3.3.0

References

NVD — CVE-2020-9757 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-9757
Security Fix Commit FIX COMMIT
https://github.com/nystudio107/craft-seomatic/commit/65ab659cb6c914c7ad671af1e417c0da2431f79b
Security Fix Commit FIX COMMIT
https://github.com/nystudio107/craft-seomatic/commit/a1c2cad7e126132d2442ec8ec8e9ab43df02cc0f
Nystudio107/craft seomatic Source Repository REPOSITORY
https://github.com/giany/CVE/blob/master/CVE-2020-9757.txt
Nystudio107/craft seomatic Source Repository REPOSITORY
https://github.com/nystudio107/craft-seomatic
Nystudio107/craft seomatic Source Repository REPOSITORY
https://github.com/nystudio107/craft-seomatic/blob/v3/CHANGELOG.md

Frequently Asked Questions

What is CVE-2020-9757?
CVE-2020-9757 is a security vulnerability in Nystudio107/craft seomatic involving SEOmatic for CraftCMS allows Server-Side Template Injection under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection').
Which Nystudio107/craft seomatic versions are affected?
Affected versions include releases prior to 3.3.0 across affected packages: nystudio107/craft-seomatic.
What version fixes CVE-2020-9757?
Upgrading to 3.3.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is nystudio107/craft-seomatic affected?
Yes, nystudio107/craft-seomatic is affected in releases prior to 3.3.0. Upgrade your dependency to 3.3.0 or later.
What is the CVSS score of CVE-2020-9757?
CVE-2020-9757 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-2020-9757?
CVE-2020-9757 is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.).
How can I check Packagist dependencies for CVE-2020-9757?
Run the dependency tree command: 'inspect dependencies for nystudio107/craft-seomatic'. 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-6q4j-8pjm-5mgc",
  "modified" : "2023-08-11T18:53:13Z",
  "published" : "2022-05-24T17:10:09Z",
  "aliases" : [ "CVE-2020-9757" ],
  "summary" : "SEOmatic for CraftCMS allows Server-Side Template Injection",
  "details" : "The Seomatic component before 3.2.46 for Craft CMS allows Server-Side Template Injection and information disclosure via malformed data to the metacontainers controller.",
  "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" : "nystudio107/craft-seomatic"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-9757"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nystudio107/craft-seomatic/commit/65ab659cb6c914c7ad671af1e417c0da2431f79b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nystudio107/craft-seomatic/commit/a1c2cad7e126132d2442ec8ec8e9ab43df02cc0f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/giany/CVE/blob/master/CVE-2020-9757.txt"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/nystudio107/craft-seomatic"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nystudio107/craft-seomatic/blob/v3/CHANGELOG.md"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-12T21:45:20Z",
    "nvd_published_at" : "2020-03-04T17:15:00Z"
  }
}