Multiple vulnerabilities in Mattermost, Mattermost Server

Published: 2020-06-19 | Updated: 2020-07-17

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-21252 CVE-2018-21251
CWE-ID	CWE-732 CWE-862
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Mattermost Server Client/Desktop applications / Messaging software
Vendor	Mattermost, Inc.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Incorrect permission assignment for critical resource

EUVDB-ID: #VU30221

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-21252

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to manipulate data.

An issue was discovered in Mattermost Server before 5.2, 5.1.1, 5.0.3, and 4.10.3. Attackers could use multiple e-mail addresses to bypass a domain-based policy for signups.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Mattermost Server: 5.1.0

External links

http://mattermost.com/security-updates/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Missing Authorization

EUVDB-ID: #VU30226

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-21251

CWE-ID: CWE-862 - Missing Authorization