Arch Linux alert ASA-201504-27 (powerdns-recursor )

From:
    	     
 
Levente Polyak <anthraxx@archlinux.org> 
To:
    	     
 
arch-security@archlinux.org 
Subject:
    	     
 
[arch-security] [ASA-201504-27] powerdns-recursor: denial of service 
Date:
    	     
 
Fri, 24 Apr 2015 13:17:23 +0200
Message-ID:
    	     
 
<553A2643.6030502@archlinux.org>
Arch Linux Security Advisory ASA-201504-27
==========================================

Severity: Low
Date    : 2015-04-24
CVE-ID  : CVE-2015-1868
Package : powerdns-recursor
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE


Summary
=======

The package powerdns-recursor before version 3.7.2-1 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 3.7.2-1.

# pacman -Syu "powerdns-recursor>=3.7.2-1"

The problem has been fixed upstream in version 3.7.2.

Workaround
==========

Exposure can be limited by configuring the allow-from setting so only
trusted users can query your nameserver.

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

A bug was discovered in our label decompression code, making it possible
for names to refer to themselves, thus causing a loop during
decompression. This loop is capped at a 1000 iterations by a failsafe,
making the issue harmless on most platforms.
However, on specific platforms, the recursion involved in these 1000
steps causes memory corruption leading to a quick crash, presumably
because the default stack is too small.

Impact
======

A remote attacker is able to send queries for specifically configured
domains to trigger a flaw that may possibly lead to denial of service.

References
==========

https://doc.powerdns.com/md/security/powerdns-advisory-20...
https://access.redhat.com/security/cve/CVE-2015-1868

https://bugs.archlinux.org/task/44708