Improper input validation in MySQL Server - CVE-2020-2686

Vulnerability identifier: #VU25706

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-2686

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper input validation within the Server: Optimizer component in MySQL Server. A remote authenticated user can exploit this vulnerability to perform a denial of service (DoS) attack.

MySQL Server
Gentoo Linux
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
openEuler
rh-mysql80-mysql (Red Hat package)
mysql

Install updates from vendor's website.

MySQL Server - update to 8.0.19
rh-mysql80-mysql (Red Hat package) - update to 8.0.21-1.el7
mysql - update to 8.0.21-2

• https://www.oracle.com/security-alerts/cpujan2020.html

• Multiple vulnerabilities in Oracle MySQL
• Red Hat Software Collections update for rh-mysql80-mysql
• Gentoo update for MySQL
• openEuler 20.03 LTS update for mysql-8.0.18-2
• Red Hat Enterprise Linux 8 update for the mysql:8.0 module
• Red Hat Enterprise Linux 8 update for the mysql:8.0 module