#VU63852 Resource exhaustion in MariaDB - CVE-2021-46658

Vulnerability identifier: #VU63852

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-46658

CWE-ID: CWE-400

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
MariaDB
Server applications / Database software

Vendor: MariaDB Foundation

Description

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

The vulnerability exists due to improper handling of with_window_func=true for a subquery. A local user can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MariaDB: 10.2.0 - 10.2.39, 10.3.0 - 10.3.30, 10.4.0 - 10.4.20, 10.5.0 - 10.5.11

---

External links
https://jira.mariadb.org/browse/MDEV-25630
https://security.netapp.com/advisory/ntap-20220221-0002/
https://mariadb.com/kb/en/security/

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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