SB2020070216 - Multiple vulnerabilities in Mattermost Server

Description

This security bulletin contains information about 2 vulnerabilities.

1) Insufficient verification of data authenticity (CVE-ID: CVE-2020-14453)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

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

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to socket read operations are not appropriately restricted. A remote attacker can cause a denial of service condition on the target system.

2) Path traversal (CVE-ID: CVE-2020-14452)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

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

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to insufficient sanitization of user-supplied passed via HTTP. A remote attacker can send a specially crafted HTTP request containing directory traversal sequences and read contents of arbitrary files on the system.

Remediation

Install update from vendor's website.

References

• https://mattermost.com/security-updates/
• https://github.com/mattermost/mmctl/commit/2be537e89bd395a85643520eb1d5c28d7a6c93cf