Improper input validation in MySQL Server - CVE-2020-2898

Vulnerability identifier: #VU26923

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-2898

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

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

MySQL Server
Gentoo Linux
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
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
Fedora
mysql-5.7 (Ubuntu package)
mysql-8.0 (Ubuntu package)
rh-mysql80-mysql (Red Hat package)
community-mysql
mysql

Install updates from vendor's website.

mysql-5.7 (Ubuntu package) - addressed in versions 5.7.30-0ubuntu0.16.04.1, 5.7.30-0ubuntu0.18.04.1
mysql-8.0 (Ubuntu package) - addressed in versions 8.0.20-0ubuntu0.19.10.1, 8.0.20-0ubuntu0.20.04.1
rh-mysql80-mysql (Red Hat package) - update to 8.0.21-1.el7
community-mysql - addressed in versions 8.0.20-1.fc30, 8.0.20-1.fc31, 8.0.20-1.fc32
mysql - addressed in versions 8.0-3020200430120139.a5b0195c, 8.0-3120200430120139.f636be4b, 8.0-3220200430120139.43bbeeef

• https://www.oracle.com/security-alerts/cpuapr2020.html

• Multiple vulnerabilities in MySQL Server
• Ubuntu update for MySQL
• Red Hat Software Collections update for rh-mysql80-mysql
• Gentoo update for MySQL
• Red Hat Enterprise Linux 8 update for the mysql:8.0 module
• Red Hat Enterprise Linux 8 update for the mysql:8.0 module
• Fedora 31 Modular update for mysql
• Fedora 30 Modular update for mysql
• Fedora 32 Modular update for mysql
• Fedora 32 update for community-mysql
• Fedora 31 update for community-mysql
• Fedora 30 update for community-mysql