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.
Solution:
Workaround:
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
| Link | Tags |
|---|---|
| http://www.securityfocus.com/bid/104236 | third party advisory vdb entry |
| https://kb.isc.org/docs/aa-01606 | vendor advisory |
| http://www.securitytracker.com/id/1040942 | third party advisory vdb entry |
| https://security.netapp.com/advisory/ntap-20180926-0004/ | third party advisory |