PT-2026-103713 · Misp · Misp
CVSS v4.0
7.6
Alta
| Vetor | AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
MISP contains a vulnerability in its one-time password (OTP) authentication flow that allows replay of a consumed HOTP (paper) token and rewinding of the token counter.
The HOTP verification logic compared the submitted token against a counter value that was cached in the user's session at the time the password was entered, rather than against the authoritative counter stored in the database. Because the session-cached counter is not updated after a token is successfully consumed, an attacker who holds a valid session (password already submitted) can reuse a previously burned HOTP token. The stale cached counter still matches the replayed token, granting a second successful authentication and effectively rewinding the counter state.
Preconditions:
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The target user has HOTP (paper token) second-factor authentication enabled.
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The attacker possesses a valid session in which the password step has already been completed (the OTP step is pending).
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The attacker has access to at least one HOTP token value (e.g., a paper token list).
Security impact:
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Bypass of the second authentication factor, allowing unauthorized access to a user's MISP account.
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Corruption of the HOTP counter state, potentially invalidating subsequent legitimate tokens or enabling further replays.
Affected versions: <2.5.48.
Correção
Improper Authentication
Race Condition
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Identificadores relacionados
Produtos afetados
Misp