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Advisories

Hickory DNS 0.26.0 before 0.26.2 Response Validation Bypass via QDCOUNT=0

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Severity
medium
Date
Affecting

  • hickory-dns >= 0.26.0, < 0.26.2

  • hickory-dns >= 0.25.0, <= 0.25.2

CWE
  • CWE-290 Authentication Bypass by Spoofing
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
qifan-sailboat
Description
Hickory DNS hickory-net 0.26.0 before 0.26.2 and hickory-proto 0.25.0 through 0.25.2 skip the check that a UDP response's question section matches the query when the response has an empty question section (QDCOUNT=0), and also skip the case-randomization check. Remote attackers able to inject spoofed UDP responses can send QDCOUNT=0 responses to bypass these checks, weakening defenses against DNS spoofing.

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