CVE-2021-36150: Silverstripe/admin Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-j66h-cc96-c32q
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-36150 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Silverstripe/admin libraries in the Packagist ecosystem. The issue involves cross-site scripting in silverstripe framework. Remediation is available by upgrading affected packages to version 1.8.1.

CVE-2021-36150 at a Glance

CVE Identifier CVE-2021-36150
GHSA Identifier GHSA-j66h-cc96-c32q
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Silverstripe/admin
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.1

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

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

How to Fix CVE-2021-36150

To remediate this vulnerability, upgrade all affected Silverstripe/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.

silverstripe/admin fixed: 1.8.1 
Upgrade silverstripe/admin to 1.8.1
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 silverstripe/admin

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-36150, inspect your project dependencies for Silverstripe/admin:

inspect dependencies for silverstripe/admin

Analyze the terminal output to locate any version of Silverstripe/admin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.8.1), 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 Silverstripe/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

SilverStripe Framework through 4.8.1 allows XSS.

CVE-2021-36150 Affected Silverstripe/admin Versions

1 component(s)
Fixed Versions:
1.8.1
Product / Package Ecosystem Affected Versions Fixed Version
silverstripe/admin
 Packagist
≥ 1.0.0
< 1.8.1
1.8.1

References

NVD — CVE-2021-36150 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-36150
Silverstripe/admin Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/admin/CVE-2021-36150.yaml
Silverstripe/admin Source Repository REPOSITORY
https://github.com/silverstripe/silverstripe-framework
Silverstripe/admin Source Repository REPOSITORY
https://github.com/silverstripe/silverstripe-framework/releases
Silverstripe/admin Release RELEASE
https://www.silverstripe.org/download/security-releases/CVE-2021-36150

Frequently Asked Questions

What is CVE-2021-36150?
CVE-2021-36150 is a security vulnerability in Silverstripe/admin involving Cross-site Scripting in SilverStripe Framework under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Silverstripe/admin versions are affected?
Affected versions include releases prior to 1.8.1 across affected packages: silverstripe/admin.
What version fixes CVE-2021-36150?
Upgrading to 1.8.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is silverstripe/admin affected?
Yes, silverstripe/admin is affected in releases prior to 1.8.1. Upgrade your dependency to 1.8.1 or later.
What is the CVSS score of CVE-2021-36150?
CVE-2021-36150 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-36150?
CVE-2021-36150 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 Packagist dependencies for CVE-2021-36150?
Run the dependency tree command: 'inspect dependencies for silverstripe/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-j66h-cc96-c32q",
  "modified" : "2021-10-18T14:54:10Z",
  "published" : "2021-10-12T18:42:30Z",
  "aliases" : [ "CVE-2021-36150" ],
  "summary" : "Cross-site Scripting in SilverStripe Framework",
  "details" : "SilverStripe Framework through 4.8.1 allows XSS.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "silverstripe/admin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.8.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-36150"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/admin/CVE-2021-36150.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/silverstripe/silverstripe-framework"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/silverstripe/silverstripe-framework/releases"
  }, {
    "type" : "WEB",
    "url" : "https://www.silverstripe.org/download/security-releases/CVE-2021-36150"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-10-08T21:42:15Z",
    "nvd_published_at" : "2021-10-07T14:15:00Z"
  }
}