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Advisories

Hickory DNS Missing IPv4-Mapped IPv6 Canonicalization Access Control Bypass

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Severity
medium
Date
Affecting

  • hickory-dns >= 0.25.0-alpha.3, <= 0.26.0-alpha.1

  • hickory-dns >= 0.26.0, < 0.26.2

  • hickory-dns >= 0.26.0, < 0.26.2

  • hickory-dns >= 0.25.0-alpha.1, < 0.26.2

CWE
  • CWE-284 Improper Access Control
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
qifan-sailboat
Description
hickory-proto and hickory-resolver 0.26.0 before 0.26.2, hickory-server 0.25.0-alpha.1 before 0.26.2, and hickory-recursor 0.25.0-alpha.3 through 0.26.0-alpha.1 fail to canonicalize IPv4-mapped IPv6 addresses when checking deny_answers, deny_server, or AccessControlSet rules. Attackers can use IPv4-mapped addresses to evade answer filtering, trigger queries to denied nameservers, or reach hickory-server library deployments on dual-stack IPv6 sockets from denied clients.

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