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ISC BIND 9.7.1 - 9.7.2-P3 IXFR /DDNS Update Combinded with High Query Rate DoS

High

Synopsis

The remote DNS server is vulnerable to a denial of service attack.

Description

The remote host is running Bind, a popular name server. Versions of Bind 9.7.1-9.7.2-P3 are affected by a denial of service vulnerability. There is a small window of time after an authoritative server processes a successful IXFR transfer or a dynamic update during which the IXFR / update coupled with a query may cause a deadlock to occur. A server experiencing a high query and/or update rate will have a higher chance of being deadlocked.

Solution

Upgrade to BIND 9.7.3 or later.