[ASA-201901-2] polkit: privilege escalation

[Santiago Torres-Arias]

Arch Linux Security Advisory ASA-201901-2
=========================================

Severity: High
Date    : 2019-01-08
CVE-ID  : CVE-2018-19788
Package : polkit
Type    : privilege escalation
Remote  : No
Link    : https://security.archlinux.org/AVG-828

Summary
=======

The package polkit before version 0.115+24+g5230646-1 is vulnerable to
privilege escalation.

Resolution
==========

Upgrade to 0.115+24+g5230646-1.

# pacman -Syu "polkit>=0.115+24+g5230646-1"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

None.

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

A security issue has been found in polkit <= 0.115, where an
unprivileged user with a UID > INT_MAX can successfully execute any
systemctl command.

Impact
======

A local, unprivileged user whose UID is larger than INT_MAX can
escalate privileges.

References
==========

https://seclists.org/oss-sec/2018/q4/198
https://gitlab.freedesktop.org/polkit/polkit/issues/74
https://gitlab.freedesktop.org/polkit/polkit/commit/2cb40c4d5feeaa09325522bd7d97910f1b59e379
https://security.archlinux.org/CVE-2018-19788
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