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PowerDNS Security Advisory 2016-04: Insufficient validation of TSIG signatures
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Two issues have been found in PowerDNS Authoritative Server allowing an attacker in position of man-in-the-middle to alter the content of an AXFR because of insufficient validation of TSIG signatures. The first issue is a missing check of the TSIG time and fudge values in AXFRRetriever, leading to a possible replay attack. This issue has been assigned CVE-2016-7073. The second issue is a missing check that the TSIG record is the last one, leading to the possibility of parsing records that are not covered by the TSIG signature. This issue has been assigned CVE-2016-7074.
Affected Software
Affected Software
PowerDNS Authoritative Server up to and including 3.4.10 and 4.0.1 are affected. PowerDNS Recursor from 4.0.0 up to and including 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 4.x.x to version 4.0.4.