Arch Linux alert ASA-202107-57 (systemd)

From:
             
 
Jonas Witschel via arch-security <arch-security@lists.archlinux.org>
To:
             
 
arch-security@lists.archlinux.org
Subject:
             
 
[ASA-202107-57] systemd: denial of service
Date:
             
 
Thu, 22 Jul 2021 17:51:45 +0200
Message-ID:
             
 
<20210722155145.iiv2h2aojyzllp5e@archlinux.org>
Cc:
             
 
Jonas Witschel <diabonas@archlinux.org>
Arch Linux Security Advisory ASA-202107-57
==========================================

Severity: Medium
Date    : 2021-07-21
CVE-ID  : CVE-2021-33910
Package : systemd
Type    : denial of service
Remote  : No
Link    : https://security.archlinux.org/AVG-2179

Summary
=======

The package systemd before version 249.1-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 249.1-1.

# pacman -Syu "systemd>=249.1-1"

The problem has been fixed upstream in version 249.1.

Workaround
==========

None.

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

A denial of service security issue has been found in systemd before
version 249.1. A local attacker who is able to mount a filesystem with
a very long path can crash systemd and the whole system through an
attacker-controlled alloca().

Impact
======

A local unprivileged attacker who is able to mount a filesystem with a
very long path can crash systemd and therefore the whole system.

References
==========

https://www.qualys.com/2021/07/20/cve-2021-33910/denial-o...
https://www.qualys.com/2021/07/20/cve-2021-33910/cve-2021...
https://bugzilla.redhat.com/show_bug.cgi?id=1970887
https://github.com/systemd/systemd/pull/20256
https://github.com/systemd/systemd/commit/441e0115646d54f...
https://github.com/systemd/systemd-stable/commit/764b7411...
https://security.archlinux.org/CVE-2021-33910