Mandriva Linux Security Advisory - The DNS query id generation code in BIND9 is vulnerable to cryptographic analysis which provides a 1-in-8 change of guessing the next query ID for 50% of the query IDs, which could be used by a remote attacker to perform cache poisoning by an attacker. As well, in BIND9 9.4.x, the default ACLs were note being correctly set, which could allow anyone to make recursive queries and/or query the cache contents.
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