[arch-security] [Arch Linux Security Advisory ASA-201412-9] powerdns-recursor: denial of service

[Remi Gacogne]

Arch Linux Security Advisory ASA-201412-9
=========================================

Severity: High
Date    : 2014-12-09
CVE-ID  : CVE-2014-8601
Package : powerdns-recursor
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE-2014

Summary
=======

The package powerdns-recursor before version 3.6.2-1 is vulnerable to
remote denial of service.

Resolution
==========

Upgrade to 3.6.2-1.

# pacman -Syu "powerdns-recursor>=3.6.2-1"

The problem has been fixed upstream in version 3.6.2.

Workaround
==========

Only clients in allow-from are able to trigger the degraded service, so
this should be limited to your user base.

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

PowerDNS, while acting as a caching nameserver, can be negatively
impacted by sending queries for specially configured, hard to resolve
domain names. This is the same issue as the ones found in bind
(ASA-201412-7) and unbound (ASA-201412-8).

Impact
======

A remote attacker can trick unbound into consuming a lot of resources by
sending a specially crafted query.

References
==========

http://doc.powerdns.com/md/security/powerdns-advisory-2014-02/
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8601

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