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Category:   Application (Generic)  >   PowerDNS Vendors:   powerdns.com
PowerDNS Authoritative Server Query Processing Flaws Let Remote Users Consume Excessive Resources on the Target Backend System
SecurityTracker Alert ID:  1036761
SecurityTracker URL:  http://securitytracker.com/id/1036761
CVE Reference:   CVE-2016-5426, CVE-2016-5427   (Links to External Site)
Date:  Sep 9 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Authoritative Server 3.4.9 and prior
Description:   Two vulnerabilities were reported in PowerDNS Authoritative Server. A remote user can consume excessive resources on the target system.

A remote user can send specially crafted DNS queries to consume excessive resources on the target backend system.

Specially crafted qname length values larger than 255 bytes can trigger this flaw [CVE-2016-5426].

Specially crafted label values containing a dot character ('.') can trigger this flaw [CVE-2016-5427].

Version 4.x is not affected.

Florian Heinz and Martin Kluge reported these vulnerabilities.

Impact:   A remote user can consume excessive resources on the target system.
Solution:   The vendor has issued a fix (Authoritative Server 3.4.10).

The vendor advisory is available at:

https://doc.powerdns.com/md/security/powerdns-advisory-2016-01/

Vendor URL:  doc.powerdns.com/md/security/powerdns-advisory-2016-01/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


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