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Moodle has Incorrect Default Permissions

Moderate severity GitHub Reviewed Published Mar 7, 2023 to the GitHub Advisory Database • Updated Mar 13, 2023

Package

composermoodle/moodle (Composer)

Affected versions

>= 3.11.0-beta, < 3.11.1
>= 3.10.0-beta, < 3.10.5
< 3.9.8

Patched versions

3.11.1
3.10.5
3.9.8

Description

In Moodle, insufficient capability checks made it possible to remove other users' calendar URL subscriptions.

References

Published by the National Vulnerability DatabaseMar 6, 2023
Published to the GitHub Advisory Database Mar 7, 2023
Reviewed Mar 8, 2023
Last updated Mar 13, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector:More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity:More severe for the least complex attacks.
Privileges required:More severe if no privileges are required.
User interaction:More severe when no user interaction is required.
Scope:More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality:More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity:More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability:More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(45th percentile)

Weaknesses

Incorrect Default Permissions

During installation, installed file permissions are set to allow anyone to modify those files. Learn more on MITRE.

Authorization Bypass Through User-Controlled Key

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Learn more on MITRE.

CVE ID

CVE-2021-36400

GHSA ID

GHSA-35wf-3wq2-r3hx

Source code

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