Gentoo update for systemd

Published: 2023-05-03

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-3997 CVE-2022-3821
CWE-ID	CWE-674 CWE-193
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Gentoo Linux Operating systems & Components / Operating system sys-apps/systemd-tmpfiles Operating systems & Components / Operating system package or component sys-apps/systemd Operating systems & Components / Operating system package or component
Vendor	Gentoo

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Uncontrolled recursion

EUVDB-ID: #VU59358

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3997

CWE-ID: CWE-674 - Uncontrolled Recursion

Exploit availability: No

Description

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

The vulnerability exists due to uncontrolled recursion in systemd-tmpfiles. A local user can create multiple nested directories in the /tmp folder and case systemd to crash during the system boot.

Mitigation

Update the affected packages.
sys-apps/systemd to version: 251.3
sys-apps/systemd-tmpfiles to version: 251.3
sys-apps/systemd-utils to version:
sys-fs/udev to version:

Vulnerable software versions

Gentoo Linux: All versions

sys-apps/systemd-tmpfiles: before 251.3

sys-apps/systemd: before 251.3

External links

http://security.gentoo.org/glsa/202305-15

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.

2) Off-by-one

EUVDB-ID: #VU69807