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PowerDNS Authoritative Server DoS Vulnerabilities
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
PowerDNS Authoritative Server is prone to two denial of service vulnerabilities.
Insight
Insight
Two issues have been found in PowerDNS Authoritative Server allowing a remote, unauthenticated attacker to cause an abnormal load on the PowerDNS backend by sending crafted DNS queries, which might result in a partial denial of service if the backend becomes overloaded. SQL backends for example are particularly vulnerable to this kind of unexpected load if they have not been dimensioned for it. The first issue is based on the fact that PowerDNS Authoritative Server accepts queries with a qname's length larger than 255 bytes (CVE-2016-5426). The second issue is based on the fact that PowerDNS Authoritative Server does not properly handle dot inside labels (CVE-2016-5427).
Affected Software
Affected Software
PowerDNS Authoritative Server 3.4.9 and prior.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Upgrade to version 3.4.10 or later