[ASA-202002-8] systemd: privilege escalation

[Morten Linderud]

Arch Linux Security Advisory ASA-202002-8
=========================================

Severity: High
Date    : 2020-02-12
CVE-ID  : CVE-2020-1712
Package : systemd
Type    : privilege escalation
Remote  : No
Link    : https://security.archlinux.org/AVG-1094

Summary
=======

The package systemd before version 244.2-1 is vulnerable to privilege
escalation.

Resolution
==========

Upgrade to 244.2-1.

# pacman -Syu "systemd>=244.2-1"

The problem has been fixed upstream in version 244.2.

Workaround
==========

None.

Description
===========

A heap use-after-free vulnerability was found in systemd before version
244.2, where asynchronous Polkit queries are performed while handling
dbus messages. A local unprivileged attacker can abuse this flaw to
crash systemd services or potentially execute code and elevate their
privileges, by sending specially crafted dbus messages.

Impact
======

A local unprivileged attacker is able to crash the system or execute
arbitrary code as root by abusing polkit caching mechanisms.

References
==========

https://github.com/systemd/systemd/commit/ea0d0ede03c6f18dbc5036c5e9cccf97e415ccc2
https://github.com/systemd/systemd-stable/commit/e2d4cb9843c50eff76e9104fec6b448c0d7c8814
https://security.archlinux.org/CVE-2020-1712
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