CVE-2015-5339 Moodle does not properly implement group-based access restrictions

What is CVE-2015-5339?

CVE-2015-5339 is a medium-severity missing authorization vulnerability in Moodle Moodle, published on 22 Feb 2016. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The core_enrol_get_enrolled_users web service in enrol/externallib.php in Moodle through 2.6.11, 2.7.x before 2.7.11, 2.8.x before 2.8.9, and 2.9.x before 2.9.3 does not properly implement group-based access restrictions, which allows remote authenticated users to obtain sensitive course-participant information via a web-service request.

Weakness: CWE-264, CWE-200

Which versions are affected by CVE-2015-5339?

6 open source packages ship an affected version, including moodle/moodle. It affects 1 product.

Products include Moodle Moodle.

How do I fix CVE-2015-5339?

Upgrade moodle/moodle to a fixed version for your release line: 2.7.11, 2.8.9 or 2.9.3.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2015-5339 being exploited?

There is no known exploitation of CVE-2015-5339 in the wild and no public exploit code.

Other vulnerabilities in Moodle Moodle

• CVE-2006-4935 File upload in n/a Critical 10.0
• CVE-2006-4936 Moodle does not properly validate module instance id Critical 10.0
• CVE-2004-2233 Unknown "front page vulnerability with Moodle servers" for Moodle before 1.3.2 has unknown impact and attack vectors. Critical 10.0
• CVE-2004-2235 Cross-site scripting in n/a Critical 10.0
• CVE-2004-2236 Other in n/a Critical 10.0

All Moodle Moodle vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-gmhr-6f43-7qpj.