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CVE-2021-40444

Estado: AnalizadaAlta (7.8)⚠ Explotación activa

Explotada por: EXOTIC LILY

Microsoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents. An attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document.

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Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. Microsoft Defender Antivirus and Microsoft Defender for Endpoint both provide detection and protections for the known vulnerability. Customers should keep antimalware products up to date. Customers who utilize automatic updates do not need to take additional action. Enterprise customers who manage updates should select the detection build 1.349.22.0 or newer and deploy it across their environments. Microsoft Defender for Endpoint alerts will be displayed as: “Suspicious Cpl File Execution”. Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs. Please see the Mitigations and Workaround sections for important information about steps you can take to protect your system from this vulnerability. UPDATE September 14, 2021: Microsoft has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. Please see the FAQ for important information about which updates are applicable to your system.

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).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

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

Vulnerabilidad en MSHTML explotada mediante documentos Office maliciosos que requieren interacción del usuario (abrir archivo). Permite ejecución remota de código (RCE) a través de controles ActiveX, resultando en ejecución de comandos y acceso a datos locales.

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

Restrict Web-Based ContentExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and SandboxingAntivirus/Antimalware

Tecnologías afectadas (17)

Microsoft — Windows 10 1507Microsoft — Windows 10 1607Microsoft — Windows 10 1809Microsoft — Windows 10 1909Microsoft — Windows 10 2004Microsoft — Windows 10 20h2Microsoft — Windows 10 21h1Microsoft — Windows 7Microsoft — Windows 8.1Microsoft — Windows RT 8.1Microsoft — Windows Server 2004Microsoft — Windows Server 2008Microsoft — Windows Server 2012Microsoft — Windows Server 2016Microsoft — Windows Server 2019Microsoft — Windows Server 2022Microsoft — Windows Server 20h2

CWE

Referencias

JSON original (NVD)

Mostrar
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              "versionEndExcluding": "10.0.14393.4651"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8867C828-131C-466E-9A35-80184659D540",
              "versionEndExcluding": "10.0.17763.2183"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0663409D-4AE8-4BD9-85FE-9EAED15AE9DB",
              "versionEndExcluding": "10.0.20348.230"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "292B87C7-3AC9-48FF-91D7-21D6D74C84A9",
              "versionEndExcluding": "10.0.19042.1237"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Microsoft MSHTML Remote Code Execution Vulnerability"
}