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Advisories

Hickory DNS 0.25.0 before 0.26.2 Query Amplification via Irrelevant CNAME Records

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Severity
medium
Date
Affecting

  • hickory-dns >= 0.25.0, < 0.26.2

CWE
  • CWE-400 Uncontrolled Resource Consumption
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
qifan-sailboat
Description
The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses can include CNAME records in the authority or additional sections, or outside the original query name's CNAME chain, causing excess resolver queries and increased query amplification.

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