#VU63846 Input validation error in MariaDB - CVE-2021-46662

Vulnerability identifier: #VU63846

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-2021-46662

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
MariaDB
Operating systems & Components / Operating system package or component

Vendor: Debian

Description

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

The vulnerability exists due to set_var.cc application crash in certain uses of an UPDATE statement in conjunction with a nested subquery. A local user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MariaDB: 10.3.0 - 10.3.31, 10.4.0 - 10.4.21, 10.5.0 - 10.5.12, 10.6.0 - 10.6.4

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External links
https://jira.mariadb.org/browse/MDEV-25637
https://security.netapp.com/advisory/ntap-20220221-0002/
https://mariadb.com/kb/en/security/
https://bugzilla.redhat.com/show_bug.cgi?id=2050019

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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.