Vulnerability: Assertion Failure and Undesirable Behavior in BIND 9.12 Serve-Stale Feature

CVE-2018-5737 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

A problem with the implementation of the new serve-stale feature in BIND 9.12 can lead to an assertion failure in rbtdb.c, even when stale-answer-enable is off. Additionally, problematic interaction between the serve-stale feature and NSEC aggressive negative caching can in some cases cause undesirable behavior from named, such as a recursion loop or excessive logging. Deliberate exploitation of this condition could cause operational problems depending on the particular manifestation -- either degradation or denial of service. Affects BIND 9.12.0 and 9.12.1.

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