It was discovered systemd does not correctly check the content of PIDFile files before using it to kill processes. When a service is run from an unprivileged user (e.g. User field set in the service file), a local attacker who is able to write to the PIDFile of the mentioned service may use this flaw to trick systemd into killing other services and/or privileged processes. Versions before v237 are vulnerable.
https://access.redhat.com/errata/RHSA-2019:2091
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16888
https://lists.apache.org/thread.html/[email protected]%3Cuser.cassandra.apache.org%3E
Source: MITRE
Published: 2019-01-14
Updated: 2019-10-03
Type: CWE-20
Base Score: 1.9
Vector: AV:L/AC:M/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 3.4
Severity: LOW
Base Score: 4.7
Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 1
Severity: MEDIUM