Improper input validation in MySQL Server - CVE-2021-2178

Vulnerability identifier: #VU52389

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-2021-2178

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: Replication component in MySQL Server. A remote authenticated user can exploit this vulnerability to perform a denial of service (DoS) attack.

MySQL Server
Red Hat Software Collections
Anolis OS
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Fedora
rh-mysql80-mysql (Red Hat package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
mecab
mecab-ipadic-EUCJP
mecab-ipadic
community-mysql
mysql
mysql-common
mysql-devel
mysql-errmsg
mysql-libs
mysql-server
mysql-test

Install updates from vendor's website.

MySQL Server - addressed in versions 5.7.33, 8.0.23
rh-mysql80-mysql (Red Hat package) - update to 8.0.26-1.el7
mecab - update to 0.996-1
mecab-ipadic-EUCJP - update to 2.7.0.20070801-16.0.1
mecab-ipadic - update to 2.7.0.20070801-16.0.1
community-mysql - addressed in versions 8.0.24-1.fc32, 8.0.24-1.fc33, 8.0.24-1.fc34
mysql - update to 8.0.26-1.0.1
mysql-common - update to 8.0.26-1.0.1
mysql-devel - update to 8.0.26-1.0.1
mysql-errmsg - update to 8.0.26-1.0.1
mysql-libs - update to 8.0.26-1.0.1
mysql-server - update to 8.0.26-1.0.1
mysql-test - update to 8.0.26-1.0.1
mysql - addressed in versions 8.0-3220210504011648.43bbeeef, 8.0-3320210504011648.601d93de, 8.0-3420210504011648.058368ca

• https://www.oracle.com/security-alerts/cpuapr2021.html

• Multiple vulnerabilities in MySQL Server
• Red Hat Enterprise Linux 8.4 update for the mysql:8.0 module
• Red Hat Software Collections update for rh-mysql80-mysql
• Fedora 32 update for community-mysql
• Fedora 34 update for community-mysql
• Fedora 33 update for community-mysql
• Fedora 33 Modular update for mysql
• Fedora 32 Modular update for mysql
• Fedora 34 Modular update for mysql
• Anolis OS update for mysql:8.0 module