CVE-2020-25628: Moodle/moodle Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-5x33-h32w-6vr2
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-25628 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Moodle/moodle libraries in the Packagist ecosystem. The issue involves cross site-scripting (xss) moodle. Remediation is available by upgrading affected packages to version 3.9.2, 3.8.5, 3.7.8, 3.5.14.

CVE-2020-25628 at a Glance

CVE Identifier CVE-2020-25628
GHSA Identifier GHSA-5x33-h32w-6vr2
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 Moodle/moodle
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-2020-25628

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

moodle/moodle fixed: 3.9.2 
Upgrade moodle/moodle to 3.9.2
moodle/moodle fixed: 3.8.5 
Upgrade moodle/moodle to 3.8.5
moodle/moodle fixed: 3.7.8 
Upgrade moodle/moodle to 3.7.8
moodle/moodle fixed: 3.5.14 
Upgrade moodle/moodle to 3.5.14
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 moodle/moodle

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-25628, inspect your project dependencies for Moodle/moodle:

inspect dependencies for moodle/moodle

Analyze the terminal output to locate any version of Moodle/moodle in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.9.2), 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 Moodle/moodle, 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 filter in the tag manager required extra sanitizing to prevent a reflected XSS risk. This affects 3.9 to 3.9.1, 3.8 to 3.8.4, 3.7 to 3.7.7, 3.5 to 3.5.13 and earlier unsupported versions. Fixed in 3.9.2, 3.8.5, 3.7.8 and 3.5.14.

CVE-2020-25628 Affected Moodle/moodle Versions

4 component(s)
Fixed Versions:
3.9.23.8.53.7.83.5.14
Product / Package Ecosystem Affected Versions Fixed Version
moodle/moodle
 Packagist
≥ 3.9.0
< 3.9.2
3.9.2
moodle/moodle
 Packagist
≥ 3.8.0
< 3.8.5
3.8.5
moodle/moodle
 Packagist
≥ 3.7.0
< 3.7.8
3.7.8
moodle/moodle
 Packagist
≥ 3.5
< 3.5.14
3.5.14

References

NVD — CVE-2020-25628 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-25628
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/e8632a4ad0b4da3763cbbe5949594aa449b483bb
moodle.org/mod/forum/discuss.p... WEB
https://moodle.org/mod/forum/discuss.php?d=410840
git.moodle.org/gw WEB
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-69340

Frequently Asked Questions

What is CVE-2020-25628?
CVE-2020-25628 is a security vulnerability in Moodle/moodle involving Cross site-scripting (XSS) moodle under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Moodle/moodle versions are affected?
Affected versions include releases prior to 3.9.2, 3.8.5, 3.7.8, 3.5.14 across affected packages: moodle/moodle.
What version fixes CVE-2020-25628?
Upgrading to 3.9.2, 3.8.5, 3.7.8, 3.5.14 (or the latest patched release for your respective branch) resolves the vulnerability.
Is moodle/moodle affected?
Yes, moodle/moodle is affected in releases prior to 3.9.2, 3.8.5, 3.7.8, 3.5.14. Upgrade your dependency to 3.9.2, 3.8.5, 3.7.8, 3.5.14 or later.
What is the CVSS score of CVE-2020-25628?
CVE-2020-25628 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-2020-25628?
CVE-2020-25628 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-2020-25628?
Run the dependency tree command: 'inspect dependencies for moodle/moodle'. 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-5x33-h32w-6vr2",
  "modified" : "2021-03-24T23:14:52Z",
  "published" : "2021-03-29T20:43:15Z",
  "aliases" : [ "CVE-2020-25628" ],
  "summary" : "Cross site-scripting (XSS) moodle",
  "details" : "The filter in the tag manager required extra sanitizing to prevent a reflected XSS risk. This affects 3.9 to 3.9.1, 3.8 to 3.8.4, 3.7 to 3.7.7, 3.5 to 3.5.13 and earlier unsupported versions. Fixed in 3.9.2, 3.8.5, 3.7.8 and 3.5.14.",
  "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" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.9.0"
      }, {
        "fixed" : "3.9.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.8.0"
      }, {
        "fixed" : "3.8.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.7.0"
      }, {
        "fixed" : "3.7.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.5"
      }, {
        "fixed" : "3.5.14"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-25628"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/e8632a4ad0b4da3763cbbe5949594aa449b483bb"
  }, {
    "type" : "WEB",
    "url" : "https://moodle.org/mod/forum/discuss.php?d=410840"
  }, {
    "type" : "WEB",
    "url" : "http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-69340"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-24T23:14:52Z",
    "nvd_published_at" : "2020-12-08T01:15:00Z"
  }
}