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CVE-2018-16888

Published: 14 January 2019

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.

Priority

Low

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package Release Status
systemd
Launchpad, Ubuntu, Debian
upstream
Released (237-1)
trusty Not vulnerable
(code not built)
xenial
Released (229-4ubuntu21.27)
bionic Not vulnerable
(237-3ubuntu10.9)
cosmic Not vulnerable

disco Not vulnerable

eoan Not vulnerable

Patches:
upstream: https://github.com/systemd/systemd/commit/db256aab13d8a89d583ecd2bacf0aca87c66effc
upstream: https://github.com/systemd/systemd/commit/73969ab61c39357e6892747e43307fbf07cafbed

Severity score breakdown

Parameter Value
Base score 4.7
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H