CVE-2019-10134 : Exploit Details and Defense Strategies

A vulnerability in Moodle versions prior to 3.7, 3.6.4, 3.5.6, 3.4.9, and 3.1.18 allows overconsumption of users' quota through inadequate file size verification.

Understanding CVE-2019-10134

This CVE involves a security flaw in Moodle versions before 3.7, 3.6.4, 3.5.6, 3.4.9, and 3.1.18 related to file size verification for user uploads.

What is CVE-2019-10134?

The vulnerability in Moodle versions prior to specified releases allows users to exceed their quota by bypassing file size checks for private uploads via email.

The Impact of CVE-2019-10134

CVSS Base Score: 4.2 (Medium Severity)
Attack Vector: Network
Attack Complexity: High
Privileges Required: Low
Integrity Impact: Low
Availability Impact: Low
The vulnerability does not compromise confidentiality but can lead to overconsumption of user quota limits.

Technical Details of CVE-2019-10134

This section provides detailed technical information about the CVE.

Vulnerability Description

The flaw allows users to upload files via email without proper size verification, potentially consuming more quota than allowed.

Affected Systems and Versions

Affected Product: Moodle
Vendor: Moodle
Vulnerable Versions: 3.7, 3.6.4, 3.5.6, 3.4.9, and 3.1.18

Exploitation Mechanism

The vulnerability can be exploited by users uploading files via email without the system correctly verifying the file sizes.

Mitigation and Prevention

Protect your systems from CVE-2019-10134 with these mitigation strategies.

Immediate Steps to Take

Update Moodle to versions 3.7 or later to mitigate the vulnerability.
Educate users on file upload policies and quota limits.

Long-Term Security Practices

Regularly monitor and review user uploads and quota usage.
Implement file size restrictions and proper verification mechanisms.

Patching and Updates

Apply patches provided by Moodle to fix the vulnerability and prevent quota overconsumption.