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Advisories

Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 NSEC3 Apex NODATA Validation Bypass

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Severity
medium
Date
Affecting

  • hickory-dns >= 0.25.0-alpha.3, <= 0.25.2

  • hickory-dns >= 0.26.0-alpha.1, < 0.26.2

CWE
  • CWE-358 Improperly Implemented Security Check for Standard
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Credit
qifan-sailboat
Description
Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net 0.26.0-alpha.1 before 0.26.2 contain a DNSSEC validation flaw in DnssecDnsHandle that accepts NSEC3-signed NODATA responses for zone-apex queries as secure without an NSEC3 record matching the hashed QNAME. On-path attackers or malicious authoritative servers can replay a validly signed non-apex NSEC3 with the zone's signed SOA to serve an authenticated (AD=1) denial of any apex RRtype for the negative-cache TTL.

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