Denial of service in systemd

1) Uncontrolled Memory Allocation

EUVDB-ID: #VU55034

Risk: Low

CVSSv4.0: 5.4 [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:P/U:Clear]

CVE-ID: CVE-2021-33910

CWE-ID: CWE-789 - Uncontrolled Memory Allocation

Exploit availability: Yes

Description

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

The vulnerability exists due to stack exhaustion within the basic/unit-name.c in systemd. A local user can crash the systemd (PID 1) and cause a kernel panic.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

systemd: 220 - 249

CPE2.3

• cpe:2.3:a:freedesktop_org:systemd:220:*:*:*:*:*:*:*
• cpe:2.3:a:freedesktop_org:systemd:221:*:*:*:*:*:*:*
• cpe:2.3:a:freedesktop_org:systemd:222:*:*:*:*:*:*:*

External links

https://www.openwall.com/lists/oss-security/2021/07/20/2
https://github.com/systemd/systemd/pull/20256/commits/441e0115646d54f080e5c3bb0ba477c892861ab9

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.