| Package | Affected versions | Patched versions |
|---|---|---|
| bind | ≥ 9.11.0, ≤ 9.18.50≥ 9.11.3, ≤ 9.18.50≥ 9.20.0, ≤ 9.20.24≥ 9.20.9, ≤ 9.20.24≥ 9.21.0, ≤ 9.21.23 |
It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the default). This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
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