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ISC BIND AXFR Response Denial of Service Vulnerability
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
ISC BIND is prone to a denial of service vulnerability.
Insight
Insight
Primary DNS servers may cause a denial of service (secondary DNS server crash) via a large AXFR response, and possibly allows IXFR servers to cause a denial of service (IXFR client crash) via a large IXFR response and allows remote authenticated users to cause a denial of service (primary DNS server crash) via a large UPDATE message
Affected Software
Affected Software
Version <= 9.10.4-P1
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
As a workaround operators of servers which accept untrusted zone data can mitigate their risk by operating an intermediary server whose role it is to receive zone data and then (if successful) re-distribute it to client-facing servers. Successful exploitation of the attack against the intermediary server may still occur but denial of service against the client-facing servers is significantly more difficult to achieve in this scenario.