Moodle up to 2.7.13/2.8.11/2.9.5/3.0.3 Restore Teacher access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Moodle up to 2.7.13/2.8.11/2.9.5/3.0.3. The affected element is an unknown function of the component Restore Teacher. Executing a manipulation can lead to access control. This vulnerability appears as CVE-2016-3733. The attack may be performed from remote. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Moodle up to 2.7.13/2.8.11/2.9.5/3.0.3 (Learning Management Software). It has been declared as critical. This vulnerability affects an unknown part of the component Restore Teacher. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect integrity, and availability. CVE summarizes:

The "restore teacher" feature in Moodle 3.0 through 3.0.3, 2.9 through 2.9.5, 2.8 through 2.8.11, 2.7 through 2.7.13, and earlier allows remote authenticated users to overwrite the course idnumber.

The bug was discovered 05/18/2016. The weakness was presented 04/20/2017 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2016-3733 since 03/30/2016. The attack can be initiated remotely. A single authentication is necessary for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 46 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 91930 (FreeBSD : moodle -- multiple vulnerabilities (8656cf5f-4170-11e6-8dfe-002590263bf5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.moodle.org. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (91930). See VDB-100345, VDB-100346, VDB-100347 and VDB-100349 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.3
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 91930
Nessus Name: FreeBSD : moodle -- multiple vulnerabilities (8656cf5f-4170-11e6-8dfe-002590263bf5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for moodle FEDORA-2016-286bacdbfb
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.moodle.org

Timelineinfo

03/30/2016 🔍
05/18/2016 +49 days 🔍
07/03/2016 +46 days 🔍
07/05/2016 +2 days 🔍
04/20/2017 +289 days 🔍
04/20/2017 +0 days 🔍
04/21/2017 +1 days 🔍
12/21/2020 +1340 days 🔍

Sourcesinfo

Product: moodle.org

Advisory: openwall.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-3733 (🔍)
GCVE (CVE): GCVE-0-2016-3733
GCVE (VulDB): GCVE-100-100348
OSVDB: - CVE-2016-3733 - Moodle - Data Overwrite Issue
SecurityTracker: 1035902

See also: 🔍

Entryinfo

Created: 04/21/2017 09:46
Updated: 12/21/2020 09:34
Changes: 04/21/2017 09:46 (72), 09/18/2020 17:21 (3), 12/21/2020 09:34 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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