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Knot Resolver < 5.1.1 NXNSAttack Vulnerability

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

2 years ago

Modified

Modified

2 years ago

Summary

Knot Resolver is prone to a denial of service vulnerability (NXNSAttack).

Insight

Insight

Knot Resolver allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an 'NXNSAttack' issue. This is triggered by random subdomains in the NSDNAME in NS records.

Affected Software

Affected Software

Knot Resolver prior to version 5.1.1.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Update to version 5.1.1 or later.

Common Vulnerabilities and Exposures (CVE)