Moodle up to 3.1.16/3.4.7/3.5.4/3.6.2 Submission Comment redirect

Summaryinfo

A vulnerability marked as critical has been reported in Moodle up to 3.1.16/3.4.7/3.5.4/3.6.2. Affected by this vulnerability is an unknown functionality of the component Submission Comment Handler. This manipulation causes redirect. This vulnerability is handled as CVE-2019-3850. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Moodle up to 3.1.16/3.4.7/3.5.4/3.6.2 (Learning Management Software). It has been declared as critical. Affected by this vulnerability is an unknown code of the component Submission Comment Handler. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability was found in moodle before versions 3.6.3, 3.5.5, 3.4.8 and 3.1.17. Links within assignment submission comments would open directly (in the same window). Although links themselves may be valid, opening within the same window and without the no-referrer header policy made them more susceptible to exploits.

The bug was discovered 03/19/2019. The weakness was released 03/26/2019 as not defined bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2019-3850 since 01/03/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 7 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 261362 (Linux Distros Unpatched Vulnerability : CVE-2019-3850), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.1.17, 3.4.8, 3.5.5 or 3.6.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (261362). Entries connected to this vulnerability are available at VDB-132453, VDB-132452, VDB-132450 and VDB-132449. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Learning Management Software

Name

• Moodle

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10
• 3.1.11
• 3.1.12
• 3.1.13
• 3.1.14
• 3.1.15
• 3.1.16
• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.4.6
• 3.4.7
• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.6.0
• 3.6.1
• 3.6.2

License

• open-source

Website

• Product: https://moodle.org/

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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