Arch Linux ASA-201511-6 Medium: PowerDNS Denial Of Service

Arch Linux Security Advisory ASA-201511-6
========================================
Severity: Medium
Date    : 2015-11-12
CVE-ID  : CVE-2015-5311
Package : powerdns
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package powerdns before version 3.4.7-1 is vulnerable to denial of
service.

Resolution
=========
Upgrade to 3.4.7-1.

# pacman -Syu "powerdns>=3.4.7-1"

The problems have been fixed upstream in version 3.4.7.

Workaround
=========
When the PowerDNS Authoritative Server is run inside the guardian
(--guardian), or inside a supervisor like supervisord or systemd, it
will be automatically restarted, limiting the impact to a somewhat
degraded service.

Description
==========
This bug was found using afl-fuzz in the packet parsing code. This bug,
when exploited, causes an assertion error and consequent termination of
the the pdns_server process, causing a denial-of-service.

Impact
=====
A remote attacker is able to send specially crafted query packets to
crash the powerdns server process, causing a denial-of-service.

References
=========
https://access.redhat.com/security/cve/CVE-2015-5311
/
https://bugs.archlinux.org/task/47014