SB2020062506 - Multiple vulnerabilities in Mattermost Desktop application

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Authentication (CVE-ID: CVE-2020-14455)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the prompting for HTTP Basic Authentication is mishandled, allowing phishing. A remote attacker can bypass authentication process and gain unauthorized access to the application.

2) Improper Authentication (CVE-ID: CVE-2020-14456)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the Same Origin Policy is mishandled during access-control decisions for web APIs which allows 3rd-party origins access to restricted web APIs. A remote attacker can bypass authentication process and gain unauthorized access to the application.

Remediation

Install update from vendor's website.

References

• https://mattermost.com/security-updates/
• https://github.com/mattermost/desktop/commit/8f45afa080788cf3ba3fb86c7a639de012c22a54
• https://github.com/mattermost/desktop/commit/c990c417feca2350e4d19b18e098bd58d4f8dcfd