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When using forwarders, bogus NS records supplied by, or via, those forwarders may be cached and used by named if it needs to recurse for any reason, causing it to obtain and pass on potentially incorrect answers. Some examples of configurations that will be vulnerable are: *Resolvers using per zone or global forwarding with forward first (forward first is the default). *Resolvers not using global forwarding, but with per-zone forwarding with either forward first (the default) or forward only. *Resolvers configured with global forwarding along with zone statements that disable forwarding for part of the DNS namespace. Authoritative-only BIND 9 servers are not vulnerable to this flaw.
Created bind tracking bugs for this issue: Affects: fedora-34 [bug 2072538] Affects: fedora-35 [bug 2072540] Created dhcp tracking bugs for this issue: Affects: fedora-34 [bug 2072539] Affects: fedora-35 [bug 2072541]