PT-2021-2240 · Moodle+1 · Moodle+1

Rik Gouw · CVE-2021-20185 · Published 2021-01-12 · Updated 2024-03-06

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions Moodle versions prior to 3.10.1 Moodle versions prior to 3.9.4 Moodle versions prior to 3.8.7 Moodle versions prior to 3.5.16

Description The issue is related to a lack of character limit when sending messages in Moodle, which could result in a client-side denial of service for users receiving very large messages. This could be exploited by a remote attacker to cause a denial of service.

Recommendations For versions prior to 3.10.1, update to version 3.10.1 or later. For versions prior to 3.9.4, update to version 3.9.4 or later. For versions prior to 3.8.7, update to version 3.8.7 or later. For versions prior to 3.5.16, update to version 3.5.16 or later.

Fix

DoS

Resource Exhaustion

Allocation of Resources Without Limits

Weakness Enumeration

CWE-400

CWE-770

Related Identifiers

ALT-PU-2021-1050

ALT-PU-2021-1098

ALT-PU-2022-1641

BDU:2021-01192

BIT-MOODLE-2021-20185

CVE-2021-20185

GHSA-C3J6-33R4-89Q3

Affected Products

Alt Linux

Moodle

References · 14

• https://ubuntu.com/security/CVE-2021-20185 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-20185 · Security Note
• https://osv.dev/vulnerability/GHSA-c3j6-33r4-89q3 · Vendor Advisory
• https://moodle.org/mod/forum/discuss.php?d=417168 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-20185 · Security Note
• https://osv.dev/vulnerability/CVE-2021-20185 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-01192 · Security Note
• https://osv.dev/vulnerability/BIT-moodle-2021-20185 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-20185 · Vendor Advisory
• https://github.com/moodle/moodle · Note
• https://cxsecurity.com/cveshow/CVE-2021-20185 · Note
• https://t.me/cibsecurity/22814 · Telegram Post
• https://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-67782 · Note
• https://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-67782 · Note