Vulnerability identifier: #VU39162

Vulnerability risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-3734

CWE-ID: CWE-352

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Moodle: 2.7 - 2.7.13, 2.8 - 2.8.11, 2.9 - 2.9.5, 3.0 - 3.0.3

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External links
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-53755
http://www.openwall.com/lists/oss-security/2016/05/17/4
http://www.securityfocus.com/bid/91281
http://www.securitytracker.com/id/1035902
http://bugzilla.redhat.com/show_bug.cgi?id=1335933

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.