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PowerDNS Security Advisory 2016-02: Crafted queries can cause abnormal CPU usage
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
An issue has been found in PowerDNS allowing a remote, unauthenticated attacker to cause an abnormal CPU usage load on the PowerDNS server by sending crafted DNS queries, which might result in a partial denial of service if the system becomes overloaded. This issue is based on the fact that the PowerDNS server parses all records present in a query regardless of whether they are needed or even legitimate. A specially crafted query containing a large number of records can be used to take advantage of that behaviour. This issue has been assigned CVE-2016-7068.
Affected Software
Affected Software
PowerDNS Authoritative Server up to and including 3.4.10 and 4.0.1 are affected. PowerDNS Recursor up to and including 3.7.3 and 4.0.3 are affected.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update PowerDNS Authoritative Server to version 3.4.11 or 4.0.2 respectively. Update PowerDNS Recursor to 3.7.4 or 4.0.4 respectively.