CVE-2019-3809: Moodle/moodle Moodle Blind SSRF Risk Vulnerability

CRITICAL
Advisory Identifier: GHSA-jp4g-r8c9-3534
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CVSS 10.0
CWE-918
Published
Advisory Summary

CVE-2019-3809 is a CRITICAL (CVSS 10.0) moodle blind ssrf risk vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Moodle/moodle libraries in the Packagist ecosystem. The issue involves moodle blind ssrf risk in /badges/mybackpack.php. Remediation is available by upgrading affected packages to version 3.1.16.

CVE-2019-3809 at a Glance

CVE Identifier CVE-2019-3809
GHSA Identifier GHSA-jp4g-r8c9-3534
Severity CRITICAL
CVSS v3.1 Base Score 10.0
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Moodle/moodle
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 10.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

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

How to Fix CVE-2019-3809

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: 3.1.16 
Upgrade moodle/moodle to 3.1.16
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-2019-3809, 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 3.1.16), 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. 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

A flaw was found in Moodle versions 3.1 to 3.1.15 and earlier unsupported versions. The mybackpack functionality allowed setting the URL of badges, when it should be restricted to the Mozilla Open Badges backpack URL. This resulted in the possibility of blind SSRF via requests made by the page.

CVE-2019-3809 Affected Moodle/moodle Versions

1 component(s)
Fixed Versions:
3.1.16
Product / Package Ecosystem Affected Versions Fixed Version
moodle/moodle
 Packagist
≥ 3.1
< 3.1.16
3.1.16

References

NVD — CVE-2019-3809 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-3809
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3809
Moodle/moodle Source Repository REPOSITORY
https://github.com/moodle/moodle
moodle.org/mod/forum/discuss.p... WEB
https://moodle.org/mod/forum/discuss.php?d=381229#p1536766
git.moodle.org/gw WEB
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-64222

Frequently Asked Questions

What is CVE-2019-3809?
CVE-2019-3809 is a security vulnerability in Moodle/moodle involving Moodle Blind SSRF Risk in /badges/mybackpack.php under CWE-918: Server-Side Request Forgery (SSRF).
Which Moodle/moodle versions are affected?
Affected versions include releases prior to 3.1.16 across affected packages: moodle/moodle.
What version fixes CVE-2019-3809?
Upgrading to 3.1.16 (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 3.1.16. Upgrade your dependency to 3.1.16 or later.
What is the CVSS score of CVE-2019-3809?
CVE-2019-3809 has a CVSS v3.1 base score of 10.0 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2019-3809?
CVE-2019-3809 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Packagist dependencies for CVE-2019-3809?
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-jp4g-r8c9-3534",
  "modified" : "2024-04-23T23:41:33Z",
  "published" : "2022-05-13T01:31:16Z",
  "aliases" : [ "CVE-2019-3809" ],
  "summary" : "Moodle Blind SSRF Risk in /badges/mybackpack.php",
  "details" : "A flaw was found in Moodle versions 3.1 to 3.1.15 and earlier unsupported versions. The mybackpack functionality allowed setting the URL of badges, when it should be restricted to the Mozilla Open Badges backpack URL. This resulted in the possibility of blind SSRF via requests made by the page.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.1"
      }, {
        "fixed" : "3.1.16"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-3809"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3809"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/moodle/moodle"
  }, {
    "type" : "WEB",
    "url" : "https://moodle.org/mod/forum/discuss.php?d=381229#p1536766"
  }, {
    "type" : "WEB",
    "url" : "http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-64222"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-23T23:41:33Z",
    "nvd_published_at" : "2019-03-25T18:29:00Z"
  }
}