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PowerDNS Authoritative Server DoS Vulnerabilities

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

5 years ago

Modified

Modified

3 years ago

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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

Common Vulnerabilities and Exposures (CVE)

References

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