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Three variants of YWH-PGM40640-56: Stale/Wrong DNS Data Served via
CNAME Flag Leak (DNS_DBFIND_STALEOK persistence) are presented in
GitLab issue #5751. All these variants have been converted to system
tests.
Variant 1 forwards source.stale to another server, that provides a
CNAME record, while the resolver is authoritative for target.stale.
The CNAME points to a non-existing name. A stale CNAME record should
result in a stale NXDOMAIN (instead of SERVFAIL).
Variant 2 forwards both source.stale and target.stale to other servers.
This time the CNAME points to an A RRset. If the source.stale server
is not available (and stale-answer-client-timeout is off), the cached
CNAME should be followed and pick up the fresh RRset (instead of the
stale A RRset).
Variant 3 is similar to variant 2, but this time the CNAME points to
a non-existing name again. After flushing the target, BIND should
return a stale NXDOMAIN (instead of SERVFAIL).
(cherry picked from commit
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