8.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2024-43425

CVE-2024-43425: Moodle Remote Code Execution vulnerability

A flaw was found in Moodle. Additional restrictions are required to avoid a remote code execution risk in calculated question types. Note: This requires the capability to add/update questions.

(GitHub Advisory)

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CVE-2024-43425

CVE-2024-43425:

8.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
moodle/moodle	composer	< 4.1.12	4.1.12
moodle/moodle	composer	>= 4.2.0-beta, < 4.2.9	4.2.9
moodle/moodle	composer	>= 4.3.0-beta, < 4.3.6	4.3.6
moodle/moodle	composer	>= 4.4.0-beta, < 4.4.2	4.4.2

Technical Details

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Root Cause Analysis

The vulnerability stems from insufficient input validation in calculated question formulas (CWE-94). The commit MDL-82576 explicitly mentions improving formula regexes, indicating the original validation patterns were inadequate. Calculated questions use PHP's mathematical expression evaluation, which could execute arbitrary code if formula validation allows dangerous characters. The primary function handling formula validation (qtype_calculated_validate_formula) and dataset parsing (qtype_calculated_parse_dataset_definitions) would be the most likely candidates for improper sanitization. High confidence in the validation function due to direct regex improvements in the patch, medium confidence in dataset parsing due to its role in formula variable substitution.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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