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Advisories

Hickory DNS Recursor Ghost Domain Attack via Child-Side NS RRset Caching

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Severity
high
Date
Affecting

  • hickory-dns <= 0.26.0-alpha.1

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

CWE
  • CWE-672 Operation on a Resource after Expiration or Release
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
qifan-sailboat
Description
The Hickory DNS recursor in all versions of hickory-recursor and in hickory-resolver 0.26.0-beta.1 before 0.26.2 (recursor feature) is vulnerable to ghost domain names attacks because it reuses child-side apex NS RRsets cached from zone NS queries for iterative resolution. By repeatedly querying a zone's NS records, an attacker keeps the stale RRset cached indefinitely, letting name servers whose delegation the parent revoked keep answering for the zone.

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