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Advisories

phpMyFAQ before 4.1.7 WebAuthn Replay Attack via Challenge

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severity
high
date
Affecting

  • phpMyFAQ >= 0, < 4.1.7

CWE
  • CWE-294 Authentication Bypass by Capture-replay
CVSS
9.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
arpitjain099
Description
phpMyFAQ before 4.1.7 (affected versions <= 4.1.5) fails to persist the WebAuthn login challenge generated by prepareForLogin, because neither WebAuthn controller saves the mutated key objects back to the database. At login the anti-replay comparison is skipped by its own null guard, allowing an attacker who captures a successful WebAuthn assertion to replay it indefinitely and authenticate as the user without any interaction or hardware key.

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