#VU60557 Resource exhaustion in MariaDB - CVE-2021-46668

Vulnerability identifier: #VU60557

Vulnerability risk: Medium

CVSSv4.0: 4.9 [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: Network

Exploit availability: No

Vulnerable software:
MariaDB
Server applications / Database software

Vendor: MariaDB Foundation

Description

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.

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

Vulnerable software versions

MariaDB: 10.2.0 - 10.2.41, 10.3.0 - 10.3.32, 10.4.0 - 10.4.22, 10.5.0 - 10.5.13, 10.6.0 - 10.6.5, 10.7.0 - 10.7.1

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.