CVE-2024-27095: Decidim admin Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-529p-jj47-w3m3
Share
CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2024-27095 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Decidim admin libraries in the RubyGems ecosystem. The issue involves decidim cross-site scripting (xss) in the admin panel. Remediation is available by upgrading affected packages to version 0.28.1, 0.27.6.

CVE-2024-27095 at a Glance

CVE Identifier CVE-2024-27095
GHSA Identifier GHSA-529p-jj47-w3m3
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Decidim admin
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 5.4

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:R/S:C/C:H/I:N/A:N).

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

How to Fix CVE-2024-27095

To remediate this vulnerability, upgrade all affected Decidim admin 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-admin fixed: 0.28.1 
Upgrade decidim-admin to 0.28.1
decidim-admin fixed: 0.27.6 
Upgrade decidim-admin to 0.27.6
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 decidim-admin

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-27095, inspect your project dependencies for Decidim admin:

inspect dependencies for decidim-admin

Analyze the terminal output to locate any version of Decidim admin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.28.1), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Decidim admin, 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 admin panel is subject to potential XSS attach in case the attacker manages to modify some records being uploaded to the server. The attacker is able to change e.g. to `<svg onload=alert('XSS')>` if they know how to craft these requests themselves. And then enter the returned blob ID to the form inputs manually by modifying the edit page source. ### Patches Available in versions 0.27.6 and 0.28.1. ### Workarounds Review the user accounts that have access to the admin panel (i.e. general Administrators, and participatory space's Administrators) and remove access to them if they don't need it. ### References OWASP ASVS v4.0.3-5.1.3

CVE-2024-27095 Affected Decidim admin Versions

2 component(s)
Fixed Versions:
0.28.10.27.6
Product / Package Ecosystem Affected Versions Fixed Version
decidim-admin
gem/decidim-admin
RubyGems
≥ 0.28.0.rc1
< 0.28.1
0.28.1
decidim-admin
gem/decidim-admin
RubyGems
< 0.27.6
0.27.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/decidim/decidim/security/advisories/GHSA-529p-jj47-w3m3
NVD — CVE-2024-27095 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-27095
Decidim admin Source Repository REPOSITORY
https://github.com/decidim/decidim
Decidim admin Release RELEASE
https://github.com/decidim/decidim/releases/tag/v0.27.6
Decidim admin Release RELEASE
https://github.com/decidim/decidim/releases/tag/v0.28.1
Decidim admin Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-admin/CVE-2024-27095.yml

Frequently Asked Questions

What is CVE-2024-27095?
CVE-2024-27095 is a security vulnerability in Decidim admin involving Decidim cross-site scripting (XSS) in the admin panel under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Decidim admin versions are affected?
Affected versions include releases prior to 0.28.1, 0.27.6 across affected packages: decidim-admin.
What version fixes CVE-2024-27095?
Upgrading to 0.28.1, 0.27.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is decidim-admin affected?
Yes, decidim-admin is affected in releases prior to 0.28.1, 0.27.6. Upgrade your dependency to 0.28.1, 0.27.6 or later.
What is the CVSS score of CVE-2024-27095?
CVE-2024-27095 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2024-27095?
CVE-2024-27095 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check RubyGems dependencies for CVE-2024-27095?
Run the dependency tree command: 'inspect dependencies for decidim-admin'. 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-529p-jj47-w3m3",
  "modified" : "2024-07-11T21:36:40Z",
  "published" : "2024-07-10T16:02:07Z",
  "aliases" : [ "CVE-2024-27095" ],
  "summary" : "Decidim cross-site scripting (XSS) in the admin panel",
  "details" : "### Impact\n\nThe admin panel is subject to potential XSS attach in case the attacker manages to modify some records being uploaded to the server.\n\nThe attacker is able to change  e.g. to `<svg onload=alert('XSS')>` if they know how to craft these requests themselves. And then enter the returned blob ID to the form inputs manually by modifying the edit page source.\n\n### Patches\n\nAvailable in versions 0.27.6 and 0.28.1.\n\n### Workarounds\n\nReview the user accounts that have access to the admin panel (i.e. general Administrators, and participatory space's Administrators) and remove access to them if they don't need it. \n\n### References\n\nOWASP ASVS v4.0.3-5.1.3\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim-admin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.27.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "decidim-admin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.28.0.rc1"
      }, {
        "fixed" : "0.28.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/security/advisories/GHSA-529p-jj47-w3m3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-27095"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/decidim/decidim"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/releases/tag/v0.27.6"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/decidim/decidim/releases/tag/v0.28.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/decidim-admin/CVE-2024-27095.yml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-07-10T16:02:07Z",
    "nvd_published_at" : "2024-07-10T19:15:10Z"
  }
}