A certain pseudo-random number generator (PRNG) algorithm that uses
ADD with 0 random hops (aka "Algorithm A0"), as used in OpenBSD 3.5
through 4.2 and NetBSD 1.6.2 through 4.0, allows remote attackers to
guess sensitive values such as (1) DNS transaction IDs or (2) IP
fragmentation IDs by observing a sequence of previously generated
values. NOTE: this issue can be leveraged for attacks such as DNS
cache poisoning, injection into TCP packets, and OS fingerprinting.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
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disclosed, or updated in CVE.
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