CVE-2023-36465: Decidim Decidim Has Broken Access Control Vulnerability

HIGH
Advisory Identifier: GHSA-639h-86hw-qcjq
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CVSS 7.1
CWE-284 CWE-732
Published
Advisory Summary

CVE-2023-36465 is a HIGH (CVSS 7.1) decidim has broken access control vulnerability (CWE-284: Improper Access Control) affecting Decidim libraries in the RubyGems ecosystem. The issue involves decidim has broken access control in templates. Remediation is available by upgrading affected packages to version 0.26.8, 0.27.4.

CVE-2023-36465 at a Glance

CVE Identifier CVE-2023-36465
GHSA Identifier GHSA-639h-86hw-qcjq
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-284: Improper Access Control
Affected Product Decidim
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 7.1

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

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

How to Fix CVE-2023-36465

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

decidim fixed: 0.26.8 
Upgrade decidim to 0.26.8
decidim-templates fixed: 0.26.8 
Upgrade decidim-templates to 0.26.8
decidim-templates fixed: 0.27.4 
Upgrade decidim-templates to 0.27.4
decidim fixed: 0.27.4 
Upgrade decidim to 0.27.4
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 decidim

How to Check if You Are Affected

To determine whether your application is affected by CVE-2023-36465, inspect your project dependencies for Decidim:

inspect dependencies for decidim

Analyze the terminal output to locate any version of Decidim in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.26.8), 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 Decidim, 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

### Impact The `templates` module doesn't enforce the correct permissions, allowing any logged-in user to access to this functionality in the administration panel. An attacker could use this vulnerability to change, create or delete templates of surveys.

CVE-2023-36465 Affected Decidim Versions

4 component(s)
Fixed Versions:
0.26.80.27.4
Product / Package Ecosystem Affected Versions Fixed Version
decidim
gem/decidim
RubyGems
≥ 0.23.2
< 0.26.8
0.26.8
decidim-templates
gem/decidim-templates
RubyGems
≥ 0.23.2
< 0.26.8
0.26.8
decidim-templates
gem/decidim-templates
RubyGems
≥ 0.27.0
< 0.27.4
0.27.4
decidim
gem/decidim
RubyGems
≥ 0.27.0
< 0.27.4
0.27.4

References

Decidim Release RELEASE
https://github.com/decidim/decidim/releases/tag/v0.27.4
Decidim Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-templates/CVE-2023-36465.yml
Decidim Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2023-36465.yml
GitHub Advisory / Wiki ADVISORY
https://github.com/decidim/decidim/security/advisories/GHSA-639h-86hw-qcjq
NVD — CVE-2023-36465 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-36465
Decidim Source Repository REPOSITORY
https://github.com/decidim/decidim
Decidim Release RELEASE
https://github.com/decidim/decidim/releases/tag/v0.26.8

Frequently Asked Questions

What is CVE-2023-36465?
CVE-2023-36465 is a security vulnerability in Decidim involving Decidim has broken access control in templates under CWE-284: Improper Access Control.
Which Decidim versions are affected?
Affected versions include releases prior to 0.26.8, 0.27.4 across affected packages: decidim, decidim-templates.
What version fixes CVE-2023-36465?
Upgrading to 0.26.8, 0.27.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is decidim affected?
Yes, decidim is affected in releases prior to 0.26.8, 0.27.4. Upgrade your dependency to 0.26.8, 0.27.4 or later.
Is decidim-templates affected?
Yes, decidim-templates is affected in releases prior to 0.26.8, 0.27.4. Upgrade your dependency to 0.26.8, 0.27.4 or later.
What is the CVSS score of CVE-2023-36465?
CVE-2023-36465 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.
What CWE is associated with CVE-2023-36465?
CVE-2023-36465 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 RubyGems dependencies for CVE-2023-36465?
Run the dependency tree command: 'inspect dependencies for decidim'. 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-639h-86hw-qcjq",
  "modified" : "2023-10-13T22:47:57Z",
  "published" : "2023-10-05T20:52:46Z",
  "aliases" : [ "CVE-2023-36465" ],
  "summary" : "Decidim has broken access control in templates",
  "details" : "### Impact\n\nThe `templates` module doesn't enforce the correct permissions, allowing any logged-in user to access to this functionality in the administration panel. An attacker could use this vulnerability to change, create or delete templates of surveys.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.23.2"
      }, {
        "fixed" : "0.26.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim-templates"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.23.2"
      }, {
        "fixed" : "0.26.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim-templates"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.27.0"
      }, {
        "fixed" : "0.27.4"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.27.0"
      }, {
        "fixed" : "0.27.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/security/advisories/GHSA-639h-86hw-qcjq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-36465"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/decidim/decidim"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/releases/tag/v0.26.8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/releases/tag/v0.27.4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-templates/CVE-2023-36465.yml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim/CVE-2023-36465.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284", "CWE-732" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-10-05T20:52:46Z",
    "nvd_published_at" : "2023-10-06T12:15:11Z"
  }
}