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Unbound DNS Resolver Denial of Service Vulnerability
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:P/A:N
Solution Type
Solution Type
Vendor Patch
Created
Created
6 years ago
Modified
Modified
5 years ago
Summary
A flaw was found in the way unbound before 1.6.8 validated wildcard-synthesized NSEC records. An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.
Affected Software
Affected Software
Unbound DNS Resolver before version 1.6.8
Detection Method
Detection Method
The script checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 1.6.8 or above