Resource exhaustion in MariaDB - CVE-2021-46668

Vulnerability identifier: #VU60557

CSH Severity: Medium

CVSS v4.0: 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/E:U/U:Green

CVE-ID: CVE-2021-46668

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

Affected software:
MariaDB
Amazon Linux AMI
Gentoo Linux
SUSE CaaS Platform
SUSE Manager Proxy
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Enterprise Storage
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
Anolis OS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Slackware Linux
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Realtime Extension
SUSE Linux Enterprise Module for Server Applications
SUSE Linux Enterprise Server for SAP Applications
openSUSE Leap
Ubuntu
openEuler
Fedora
Red Hat Software Collections
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
rh-mariadb103-mariadb (Red Hat package)
rh-mariadb103-galera (Red Hat package)
mysql-selinux (Red Hat package)
Judy
Judy-devel
asio-devel
mariadb-tools
mariadb-errormessages
mariadb-tools-debuginfo
mariadb-client-debuginfo
mariadb-debugsource
mariadb-debuginfo
libmysqld-devel
libmysqld19
libmysqld19-debuginfo
mariadb
mariadb-client
mariadb-server (Ubuntu package)
mariadb-backup
mariadb-common
mariadb-devel
mariadb-embedded
mariadb-embedded-devel
mariadb-errmsg
mariadb-gssapi-server
mariadb-oqgraph-engine
mariadb-server
mariadb-server-galera
mariadb-server-utils
mariadb-test
libmariadbd-devel
libmariadbd19
libmariadbd19-debuginfo
mariadb-config
mariadb-pam
mariadb-rocksdb-engine
mariadb-galera
mariadb105
rh-mariadb105-mariadb (Red Hat package)
mariadb (Red Hat package)
mariadb-rpm-macros
mariadb-test-debuginfo
mariadb-bench
mariadb-bench-debuginfo
galera
rh-mariadb105-galera (Red Hat package)
galera (Red Hat package)

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

The vulnerability exists due to application does not properly control consumption of internal resources. A remote user can trigger resource exhaustion via certain long SELECT DISTINCT statements that improperly interact with storage-engine resource limitations for temporary data structures.

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

• https://jira.mariadb.org/browse/MDEV-25787
• https://mariadb.com/kb/en/security/