#VU63849 Resource exhaustion in MariaDB - CVE-2021-46657

Vulnerability identifier: #VU63849

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-2021-46657

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 remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when processing certain subquery uses of ORDER BY. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MariaDB: 5.5.10 - 5.5.60, 10.0.0, 10.1.0, 10.2.0 - 10.2.38, 10.3.0 - 10.3.29, 10.4.0 - 10.4.19, 10.5.0 - 10.5.10, 10.6.0 - 10.6.1

---

External links
https://jira.mariadb.org/browse/MDEV-25629
https://security.netapp.com/advisory/ntap-20220221-0002/
https://mariadb.com/kb/en/security/
https://bugzilla.redhat.com/show_bug.cgi?id=2049305

---

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.