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PowerDNS Security Advisory 2016-04: Insufficient validation of TSIG signatures

Information

Severity

Severity

Medium

Family

Family

General

CVSSv2 Base

CVSSv2 Base

4.3

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

5 years ago

Modified

Modified

5 years ago

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.

Common Vulnerabilities and Exposures (CVE)