CVE-2020-9311: Silverstripe/cms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-2pw2-qpcp-m47x
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2020-9311 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Silverstripe/cms libraries in the Packagist ecosystem. The issue involves silverstripe cms xss vulnerability. Remediation is available by upgrading affected packages to version 3.7.5.

CVE-2020-9311 at a Glance

CVE Identifier CVE-2020-9311
GHSA Identifier GHSA-2pw2-qpcp-m47x
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 Silverstripe/cms
Package Ecosystem Packagist
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:L/PR:L/UI:R/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 Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-9311

To remediate this vulnerability, upgrade all affected Silverstripe/cms 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/cms fixed: Latest secure release 
Upgrade silverstripe/cms to Latest secure release
silverstripe/framework fixed: 3.7.5 
Upgrade silverstripe/framework to 3.7.5
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/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-9311, inspect your project dependencies for Silverstripe/cms:

inspect dependencies for silverstripe/cms

Analyze the terminal output to locate any version of Silverstripe/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.7.5), 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/cms, 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

In SilverStripe through 4.5, malicious users with a valid Silverstripe CMS login (usually CMS access) can craft profile information which can lead to XSS for other users through specially crafted login form URLs.

CVE-2020-9311 Affected Silverstripe/cms Versions

2 component(s)
Fixed Versions:
3.7.5
Product / Package Ecosystem Affected Versions Fixed Version
silverstripe/cms
 Packagist
≤ 4.5.0
silverstripe/framework
 Packagist
≥ 3.0.0
< 3.7.5
3.7.5

References

NVD — CVE-2020-9311 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-9311
Silverstripe/cms Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2020-9311.yaml
Silverstripe/cms Source Repository REPOSITORY
https://github.com/silverstripe/silverstripe-cms
Silverstripe/cms Release RELEASE
https://www.silverstripe.org/download/security-releases/CVE-2020-9311
Silverstripe/cms Release RELEASE
https://www.silverstripe.org/download/security-releases/cve-2020-9311

Frequently Asked Questions

What is CVE-2020-9311?
CVE-2020-9311 is a security vulnerability in Silverstripe/cms involving Silverstripe CMS XSS Vulnerability under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Silverstripe/cms versions are affected?
Affected versions include releases prior to 3.7.5 across affected packages: silverstripe/cms, silverstripe/framework.
What version fixes CVE-2020-9311?
Upgrading to 3.7.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is silverstripe/cms affected?
Yes, silverstripe/cms is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
Is silverstripe/framework affected?
Yes, silverstripe/framework is affected in releases prior to 3.7.5. Upgrade your dependency to 3.7.5 or later.
What is the CVSS score of CVE-2020-9311?
CVE-2020-9311 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-9311?
CVE-2020-9311 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-2020-9311?
Run the dependency tree command: 'inspect dependencies for silverstripe/cms'. 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-2pw2-qpcp-m47x",
  "modified" : "2023-08-22T21:59:17Z",
  "published" : "2022-05-24T17:23:42Z",
  "aliases" : [ "CVE-2020-9311" ],
  "summary" : "Silverstripe CMS XSS Vulnerability",
  "details" : "In SilverStripe through 4.5, malicious users with a valid Silverstripe CMS login (usually CMS access) can craft profile information which can lead to XSS for other users through specially crafted login form URLs.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "silverstripe/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "4.5.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "silverstripe/framework"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.7.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-9311"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2020-9311.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/silverstripe/silverstripe-cms"
  }, {
    "type" : "WEB",
    "url" : "https://www.silverstripe.org/download/security-releases/CVE-2020-9311"
  }, {
    "type" : "WEB",
    "url" : "https://www.silverstripe.org/download/security-releases/cve-2020-9311"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-13T21:33:10Z",
    "nvd_published_at" : "2020-07-15T21:15:00Z"
  }
}