CVE-2016-2155 Moodle allows attackers to modify "Exclude grade" settings

What is CVE-2016-2155?

CVE-2016-2155 is a medium-severity missing authorization vulnerability in Moodle Moodle, published on 22 May 2016. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The grade-reporting feature in Singleview (aka Single View) in Moodle 2.8.x before 2.8.11, 2.9.x before 2.9.5, and 3.0.x before 3.0.3 does not consider the moodle/grade:manage capability, which allows remote authenticated users to modify "Exclude grade" settings by leveraging the Non-Editing Instructor role.

Weakness: CWE-264

Which versions are affected by CVE-2016-2155?

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

Products include Moodle Moodle.

How do I fix CVE-2016-2155?

Upgrade moodle/moodle to a fixed version for your release line: 2.8.11, 2.9.5 or 3.0.3.

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

Is CVE-2016-2155 being exploited?

There is no known exploitation of CVE-2016-2155 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-32hg-73hp-vwc8, UBUNTU-CVE-2016-2155.