Description
An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
ISC BIND 9
Default version status: unaffected
9.16.0 to ≤ 9.18.50affected9.20.0 to ≤ 9.20.24affected9.21.0 to ≤ 9.21.23affected9.16.8-S1 to ≤ 9.18.50-S1affected9.20.9-S1 to ≤ 9.20.24-S1affected