Security restrictions bypass in systemd

1) Improper access control

EUVDB-ID: #VU10847

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-18078

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local attacker to bypass security restrictions on the target system.

The weakness exists in the systemd-tmpfiles due to improper access restrictions. A local attacker can bypass intended access restrictions via vectors involving a hard link to a file for which the user lacks write access.

Mitigation

Update to version 237.

Vulnerable software versions

systemd: All versions

CPE2.3

• cpe:2.3:a:freedesktop_org:systemd:*:*:*:*:*:*:*:*

External links

https://github.com/systemd/systemd/issues/7736

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.