Access Restriction Bypass Affecting systemd/systemd package, versions [0,243)


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.08% (36th percentile)

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  • Snyk IDSNYK-UNMANAGED-SYSTEMDSYSTEMD-2365481
  • published26 Jan 2022
  • disclosed4 Sept 2019
  • creditUnknown

Introduced: 4 Sep 2019

CVE-2019-15718  (opens in a new tab)
CWE-284  (opens in a new tab)

How to fix?

Upgrade systemd/systemd to version 243 or higher.

Overview

Affected versions of this package are vulnerable to Access Restriction Bypass. In systemd 240, bus_open_system_watch_bind_with_description in shared/bus-util.c (as used by systemd-resolved to connect to the system D-Bus instance), calls sd_bus_set_trusted, which disables access controls for incoming D-Bus messages. An unprivileged user can exploit this by executing D-Bus methods that should be restricted to privileged users, in order to change the system's DNS resolver settings.

CVSS Scores

version 3.1