#VU42829 Input validation error in Moodle - CVE-2013-2083

Vulnerability identifier: #VU42829

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-2083

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

The MoodleQuickForm class in lib/formslib.php in Moodle through 2.1.10, 2.2.x before 2.2.10, 2.3.x before 2.3.7, and 2.4.x before 2.4.4 does not properly handle a certain array-element syntax, which allows remote attackers to bypass intended form-data filtering via a crafted request.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Moodle: 2.1 - 2.1.10, 2.2 - 2.2.9, 2.3 - 2.3.6, 2.4 - 2.4.3

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External links
https://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-38885
https://lists.fedoraproject.org/pipermail/package-announce/2013-May/106965.html
https://lists.fedoraproject.org/pipermail/package-announce/2013-May/106988.html
https://lists.fedoraproject.org/pipermail/package-announce/2013-May/107026.html
https://openwall.com/lists/oss-security/2013/05/21/1
https://moodle.org/mod/forum/discuss.php?d=228935

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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.