CVE-2021-32476: Moodle/moodle Moodle Denial-of-service Risk Vulnerability
HIGHCVE-2021-32476 is a HIGH (CVSS 7.5) moodle denial-of-service risk vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Moodle/moodle libraries in the Packagist ecosystem. The issue involves moodle denial-of-service risk in the draft files area. Remediation is available by upgrading affected packages to version 3.10.4, 3.9.7, 3.8.9, 3.5.18.
CVE-2021-32476 at a Glance
Security Impact
CVSS: 7.5
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:N/S:U/C:N/I:N/A:H).
How to Fix CVE-2021-32476
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.
Upgrade moodle/moodle to 3.10.4Upgrade moodle/moodle to 3.9.7Upgrade moodle/moodle to 3.8.9Upgrade moodle/moodle to 3.5.18Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for moodle/moodleHow to Check if You Are Affected
To determine whether your application is affected by CVE-2021-32476, inspect your project dependencies for Moodle/moodle:
inspect dependencies for moodle/moodleAnalyze 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 3.10.4), 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. 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
CVE-2021-32476 Affected Moodle/moodle Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
moodle/moodle
|
Packagist |
≥ 3.10
< 3.10.4
|
3.10.4
|
|
moodle/moodle
|
Packagist |
≥ 3.9
< 3.9.7
|
3.9.7
|
|
moodle/moodle
|
Packagist |
≥ 3.8
< 3.8.9
|
3.8.9
|
|
moodle/moodle
|
Packagist |
≥ 3.5.17
< 3.5.18
|
3.5.18
|
References
Frequently Asked Questions
What is CVE-2021-32476?
Which Moodle/moodle versions are affected?
What version fixes CVE-2021-32476?
Is moodle/moodle affected?
What is the CVSS score of CVE-2021-32476?
What CWE is associated with CVE-2021-32476?
How can I check Packagist dependencies for CVE-2021-32476?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-4qxc-qxrp-33cw",
"modified" : "2024-04-23T23:39:07Z",
"published" : "2022-03-12T00:00:33Z",
"aliases" : [ "CVE-2021-32476" ],
"summary" : "Moodle denial-of-service risk in the draft files area",
"details" : "A denial-of-service risk was identified in the draft files area, due to it not respecting user file upload limits. Moodle versions 3.10 to 3.10.3, 3.9 to 3.9.6, 3.8 to 3.8.8, 3.5 to 3.5.17 and earlier unsupported versions are affected.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Packagist",
"name" : "moodle/moodle"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.10"
}, {
"fixed" : "3.10.4"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "moodle/moodle"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.9"
}, {
"fixed" : "3.9.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "moodle/moodle"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.8"
}, {
"fixed" : "3.8.9"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Packagist",
"name" : "moodle/moodle"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.5.17"
}, {
"fixed" : "3.5.18"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32476"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/moodle/moodle"
}, {
"type" : "WEB",
"url" : "https://moodle.org/mod/forum/discuss.php?d=422310"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-400", "CWE-770" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2024-04-23T23:39:07Z",
"nvd_published_at" : "2022-03-11T18:15:00Z"
}
}