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PowerDNS Security Advisory 2016-02: Crafted queries can cause abnormal CPU usage

Information

Severity

Severity

High

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

7.8

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

3 years ago

Modified

Modified

3 years ago

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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.

Common Vulnerabilities and Exposures (CVE)

References

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