The following updates has been released for Arch Linux:

ASA-201810-1: mosquitto: denial of service
ASA-201810-2: ntp: arbitrary code execution
ASA-201810-3: libxml2: denial of service
ASA-201810-4: lib32-libxml2: denial of service

ASA-201810-1: mosquitto: denial of service

Arch Linux Security Advisory ASA-201810-1
=========================================

Severity: Medium
Date : 2018-10-01
CVE-ID : CVE-2018-12543
Package : mosquitto
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-772

Summary
=======

The package mosquitto before version 1.5.3-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 1.5.3-1.

# pacman -Syu "mosquitto>=1.5.3-1"

The problem has been fixed upstream in version 1.5.3.

Workaround
==========

None.

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

If a message is sent to Mosquitto before 1.5.3 with a topic that begins
with $, but is not $SYS, then an assert that should be unreachable is
triggered and Mosquitto will exit.

Impact
======

A remote attacker is able to cause a denial of service by sending a
specially crafted mqtt message.

References
==========

https://mosquitto.org/blog/2018/09/security-advisory-cve-2018-12543/
https://github.com/eclipse/mosquitto/commit/f7474d348225bf086f6b9c69b18d6413aa6ffca6
https://security.archlinux.org/CVE-2018-12543

ASA-201810-2: ntp: arbitrary code execution

Arch Linux Security Advisory ASA-201810-2
=========================================

Severity: Medium
Date : 2018-10-01
CVE-ID : CVE-2018-12327
Package : ntp
Type : arbitrary code execution
Remote : No
Link : https://security.archlinux.org/AVG-723

Summary
=======

The package ntp before version 4.2.8.p12-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 4.2.8.p12-1.

# pacman -Syu "ntp>=4.2.8.p12-1"

The problem has been fixed upstream in version 4.2.8.p12.

Workaround
==========

None.

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

Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11
allows an attacker to achieve code execution or escalate to higher
privileges via a long string as the argument for an IPv4 or IPv6
command-line parameter.

Impact
======

A local attacker is able to execute arbitrary code via specially
crafted command line options.

References
==========

https://gist.github.com/fakhrizulkifli/9b58ed8e0354e8deee50b0eebd1c011f
http://bk.ntp.org/ntp-stable/?PAGE=patch&REV=5b3ba863G-42Ac2TFzCy-PZ8vqNfVA
https://security.archlinux.org/CVE-2018-12327

ASA-201810-3: libxml2: denial of service

Arch Linux Security Advisory ASA-201810-3
=========================================

Severity: Medium
Date : 2018-10-01
CVE-ID : CVE-2018-9251
Package : libxml2
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-672

Summary
=======

The package libxml2 before version 2.9.8-5 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 2.9.8-5.

# pacman -Syu "libxml2>=2.9.8-5"

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

Workaround
==========

None.

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

A security issue has been found in libxml2