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CVE-2024-21635

Estado: AnalizadaAlta (7.1)—

Memos is a privacy-first, lightweight note-taking service that uses Access Tokens to authenticate application access. When a user changes their password, the existing list of Access Tokens stay valid instead of expiring. If a user finds that their account has been compromised, they can update their password. In versions up to and including 0.18.1, though, the bad actor will still have access to their account because the bad actor's Access Token stays on the list as a valid token. The user will have to manually delete the bad actor's Access Token to secure their account.

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The list of Access Tokens has a generic Description which makes it hard to pinpoint a bad actor in a list of Access Tokens. A known patched version of Memos isn't available. To improve Memos security, all Access Tokens will need to be revoked when a user changes their password. This removes the session for all the user's devices and prompts the user to log in again. One can treat the old Access Tokens as "invalid" because those Access Tokens were created with the older password.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso remoto con privilegios de usuario (PR:L) a servicio expuesto; impacto: uso de tokens válidos (T1078) tras cambio de contraseña, y persistencia por falta de revocación (T1556).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementUser Account ManagementPassword PoliciesMulti-factor AuthenticationApplication Developer GuidanceActive Directory Configuration

Tecnologías afectadas (1)

Usememos — Memos

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2024-21635",
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          "role": "CISA Coordinator",
          "options": [
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      "description": [
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      "lang": "en",
      "value": "Memos is a privacy-first, lightweight note-taking service that uses Access Tokens to authenticate application access. When a user changes their password, the existing list of Access Tokens stay valid instead of expiring. If a user finds that their account has been compromised, they can update their password. In versions up to and including 0.18.1, though, the bad actor will still have access to their account because the bad actor's Access Token stays on the list as a valid token. The user will have to manually delete the bad actor's Access Token to secure their account. The list of Access Tokens has a generic Description which makes it hard to pinpoint a bad actor in a list of Access Tokens. A known patched version of Memos isn't available. To improve Memos security, all Access Tokens will need to be revoked when a user changes their password. This removes the session for all the user's devices and prompts the user to log in again. One can treat the old Access Tokens as \"invalid\" because those Access Tokens were created with the older password."
    },
    {
      "lang": "es",
      "value": "Memos es un servicio de toma de notas ligero que prioriza la privacidad y utiliza Tokens de Acceso para autenticar el acceso a la aplicación. Cuando un usuario cambia su contraseña, la lista existente de Tokens de Acceso permanece válida en lugar de caducar. Si un usuario descubre que su cuenta ha sido comprometida, puede actualizar su contraseña. Sin embargo, en versiones hasta la 0.18.1 inclusive, el actor malicioso seguirá teniendo acceso a su cuenta porque el Token de Acceso del actor malicioso permanece en la lista como un token válido. El usuario tendrá que eliminar manualmente el Token de Acceso del actor malicioso para asegurar su cuenta. La lista de Tokens de Acceso tiene una Descripción genérica, lo que dificulta identificar a un actor malicioso en una lista de Tokens de Acceso. Una versión parcheada conocida de Memos no está disponible. Para mejorar la seguridad de Memos, todos los Tokens de Acceso deberán ser revocados cuando un usuario cambie su contraseña. Esto elimina la sesión para todos los dispositivos del usuario y solicita al usuario que inicie sesión de nuevo. Se pueden tratar los Tokens de Acceso antiguos como 'inválidos' porque esos Tokens de Acceso fueron creados con la contraseña anterior."
    }
  ],
  "lastModified": "2026-10-02T00:10:00.180",
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