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Advisories

Hickory DNS DNSSEC Validation Cache Poisoning via Transient DS-Fetch Errors

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Severity
medium
Date
Affecting

  • hickory-dns >= 0.25.0-alpha.1, <= 0.26.0-alpha.1

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

CWE
  • CWE-613 Insufficient Session Expiration
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
qifan-sailboat
Description
Hickory DNS hickory-proto 0.25.0-alpha.1 through 0.26.0-alpha.1 and hickory-net before 0.26.2 contain a logic bug in DnssecDnsHandle's DS-fetch path that caches transient DS lookup errors as Bogus DNSSEC validation verdicts. An attacker who induces a SERVFAIL, REFUSED, or timeout response to a child-zone DS sub-query causes the validator to return SERVFAIL for all names under that zone until the cache entry's TTL expires.

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