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Advisories

OpenEMR before 8.5.0 TOTP Brute Force via main_screen.php and OAuth2

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Severity
high
Date
Affecting

  • openemr >= 0, < 8.5.0

CWE
  • CWE-307 Improper Restriction of Excessive Authentication Attempts
CVSS
8.6
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
PhilipPhil, gracia-gu
Description
OpenEMR before 8.5.0 lacks rate limiting or lockout on TOTP submission, allowing attackers with a valid password to brute-force the 6-digit MFA code. Attackers can script repeated POST requests to main_screen.php or the OAuth2 authorization flow with re-submitted hidden credentials to bypass two-factor authentication.

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