CVE-2021-20281 : It was possible for some users without permission to view other users' full name

It was possible for some users without permission to view other users' full names to do so via the online users block in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.

Published 2021-03-15 22:15:13

Updated 2022-08-05 17:51:39

Source Red Hat, Inc.

View at NVD, CVE.org

Vulnerability category: Information leak

Products affected by CVE-2021-20281

Moodle » Moodle
Versions from including (>=) 3.10.0 and before (<) 3.10.2
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Matching versions
Moodle » Moodle
Versions from including (>=) 3.5.0 and before (<) 3.5.17
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Matching versions
Moodle » Moodle
Versions from including (>=) 3.8.0 and before (<) 3.8.8
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Matching versions
Moodle » Moodle
Versions from including (>=) 3.9.0 and before (<) 3.9.5
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 32
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-20281

EPSS FAQ

0.11%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 45 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20281

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:P/I:N/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
5.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	3.9	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: None Availability: None

CWE ids for CVE-2021-20281

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Assigned by: secalert@redhat.com (Secondary)
CWE-863 Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-20281

https://moodle.org/mod/forum/discuss.php?d=419652

Moodle.org: MSA-21-0008: User full name disclosure within online users block
Patch;Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS/

[SECURITY] Fedora 34 Update: moodle-3.10.2-1.fc34 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://bugzilla.redhat.com/show_bug.cgi?id=1939041

1939041 – (CVE-2021-20281) CVE-2021-20281 moodle: User full name disclosure within online users block
Issue Tracking;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UFH5DDMU5TZ3JT4Q52WMRAHACA5MHIMT/

[SECURITY] Fedora 32 Update: moodle-3.8.8-1.fc32 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2021-20281

Products affected by CVE-2021-20281

Exploit prediction scoring system (EPSS) score for CVE-2021-20281

CVSS scores for CVE-2021-20281

CWE ids for CVE-2021-20281

References for CVE-2021-20281