PT-2020-8902 · Mattermost · Mattermost Server

Published 2020-06-19 · Updated 2020-06-30 · CVE-2018-21259

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 Mattermost Server versions prior to 4.10.1 Mattermost Server versions prior to 4.9.4 Mattermost Server versions prior to 4.8.2

Description The issue allows attackers to cause a denial of service, resulting in an application hang, by utilizing a malformed link in a channel.

Recommendations For versions prior to 4.10.1, update to version 4.10.1 or later. For versions prior to 4.9.4, update to version 4.9.4 or later. For versions prior to 4.8.2, update to version 4.8.2 or later.

Fix

DoS

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2018-21259

Affected Products

Mattermost Server

References · 4

• https://mattermost.com/security-updates · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-21259 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-21259 · Security Note
• https://t.me/cibsecurity/12893 · Telegram Post