Subject: [ASA-202106-24] polkit: privilege escalation

Arch Linux Security Advisory ASA-202106-24
==========================================

Severity: Medium
Date    : 2021-06-09
CVE-ID  : CVE-2021-3560
Package : polkit
Type    : privilege escalation
Remote  : No
Link    : https://security.archlinux.org/AVG-2028

Summary
=======

The package polkit before version 0.119-1 is vulnerable to privilege
escalation.

Resolution
==========

Upgrade to 0.119-1.

# pacman -Syu "polkit>=0.119-1"

The problem has been fixed upstream in version 0.119.

Workaround
==========

None.

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

A security issue was found in polkit before version 0.119. When a
requesting process disconnects from dbus-daemon just before the call to
polkit_system_bus_name_get_creds_sync starts, the process cannot get a
unique uid and pid of the process and it cannot verify the privileges
of the requesting process.

Impact
======

A local attacker could escalate privileges by exploiting a race
condition.

References
==========

https://www.openwall.com/lists/oss-security/2021/06/03/1
https://bugzilla.redhat.com/show_bug.cgi?id=1961710
https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/
https://gitlab.freedesktop.org/polkit/polkit/-/commit/a04d13affe0fa53ff618e07aa8f57f4c0e3b9b81
https://security.archlinux.org/CVE-2021-3560