Internet Systems Consortium, the developers of the BIND DNS server, is reporting a denial of service vulnerability that is being actively exploited. "Receipt of a specially-crafted dynamic update message to a zone for which the server is the master may cause BIND 9 servers to exit. Testing indicates that the attack packet has to be formulated against a zone for which that machine is a master. Launching the attack against slave zones does not trigger the assert. [...] This vulnerability affects all servers that are masters for one or more zones it is not limited to those that are configured to allow dynamic updates. Access controls will not provide an effective workaround." ISC is urgently suggesting that everyone upgrade BIND to 9.4.3-P3, 9.5.1-P3, or 9.6.1-P1
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