nvd-json-data-feeds/CVE-2024/CVE-2024-213xx/CVE-2024-21302.json

{
  "id": "CVE-2024-21302",
  "sourceIdentifier": "secure@microsoft.com",
  "published": "2024-08-08T02:15:37.827",
  "lastModified": "2024-08-15T23:15:06.727",
  "vulnStatus": "Undergoing Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Summary:\nMicrosoft was notified that an elevation of privilege vulnerability exists in Windows based systems supporting Virtualization Based Security (VBS), including a subset of Azure Virtual Machine SKUS. This vulnerability enables an attacker with administrator privileges to replace current versions of Windows system files with outdated versions. By exploiting this vulnerability, an attacker could reintroduce previously mitigated vulnerabilities, circumvent some features of VBS, and exfiltrate data protected by VBS.\nMicrosoft is developing a security update to mitigate this threat, but it is not yet available. Guidance to help customers reduce the risks associated with this vulnerability and to protect their systems until the mitigation is available in a Windows security update is provided in the Recommended Actions section of this CVE.\nThis CVE will be updated when the mitigation is available in a Windows security update. We highly encourage customers to subscribe to Security Update Guide notifications to receive an alert when this update occurs.\nUpdate: August 13, 2024\nMicrosoft has released the August 2024 security updates that include an opt-in revocation policy mitigation to address this vulnerability. Customers running affected versions of Windows are encouraged to review KB5042562: Guidance for blocking rollback of virtualization-based security related updates to assess if this opt-in policy meets the needs of their environment before implementing this mitigation. There are risks associated with this mitigation that should be understood prior to applying it to your systems. Detailed information about these risks is also available in KB5042562.\nDetails:\nA security researcher informed Microsoft of an elevation of privilege vulnerability in Windows 10, Windows 11, Windows Server 2016, and higher based systems including Azure Virtual Machines (VM) that support VBS. For more information on Windows versions and VM SKUs supporting VBS, reference: Virtualization-based Security (VBS) | Microsoft Learn.\nThe vulnerability enables an attacker with administrator privileges on the target system to replace current Windows system files with outdated versions. Successful exploitation provides an attacker with the ability to reintroduce previously mitigated vulnerabilities, circumvent VBS security features, and exfiltrate data protected by VBS.\nMicrosoft is developing a security update that will revoke outdated, unpatched VBS system files to mitigate this vulnerability, but it is not yet available. Due to the complexity of blocking such a large quantity of files, rigorous testing is required to avoid integration failures or regressions. This CVE will be updated with new information and links to the security updates once available. We highly encourage customers subscribe to Security Update Guide notifications to be alerted of updates. For more information see Microsoft Technical Security Notifications and Security Update Guide Notification System News: Create your profile now \u2013 Microsoft Security Response Center\nMicrosoft is not aware of any attempts to exploit this vulnerability. However, a public presentation regarding this vulnerability was hosted at BlackHat on August 7, 2024. The presentation was appropriately coordinated with Microsoft but may change the threat landscape. Customers concerned with these risks should reference the guidance provided in the Recommended Actions section to protect their systems.\nRecommended Actions:\nMicrosoft has released an opt-in mitigation available as an interim solution to help protect customers concerned about this vulnerability until the final mitigation is available in a security update.\n\nFor Windows 10 1809 and later, Windows 11 version 21H2 and later, and Windows Server 2019 and later, administrators can deploy a Microsoft-signed revocation policy (SkuSiPolicy.p7b) to block vulnerable, unpatched versions of VBS system files from being loaded by the operating system. For more information, refer to KB5042562: Guidance for blocking rollback of virtualiza
    },
    {
      "lang": "es",
      "value": "Resumen: Se notific\u00f3 a Microsoft que existe una vulnerabilidad de elevaci\u00f3n de privilegios en sistemas basados en Windows que admiten seguridad basada en virtualizaci\u00f3n (VBS), incluido un subconjunto de SKUS de m\u00e1quinas virtuales de Azure; permitir que un atacante con privilegios de administrador reemplace las versiones actuales de los archivos del sistema de Windows con versiones obsoletas. Al explotar esta vulnerabilidad, un atacante podr\u00eda reintroducir vulnerabilidades previamente mitigadas, eludir algunas caracter\u00edsticas de VBS y filtrar datos protegidos por VBS. Microsoft est\u00e1 desarrollando una actualizaci\u00f3n de seguridad para mitigar esta amenaza, pero a\u00fan no est\u00e1 disponible. En la secci\u00f3n Acciones recomendadas de este CVE se proporciona orientaci\u00f3n para ayudar a los clientes a reducir los riesgos asociados con esta vulnerabilidad y proteger sus sistemas hasta que la mitigaci\u00f3n est\u00e9 disponible en una actualizaci\u00f3n de seguridad de Windows. Este CVE se actualizar\u00e1 cuando la mitigaci\u00f3n est\u00e9 disponible en una actualizaci\u00f3n de seguridad de Windows. Recomendamos encarecidamente a los clientes que se suscriban a las notificaciones de la Gu\u00eda de actualizaci\u00f3n de seguridad para recibir una alerta cuando se produzca esta actualizaci\u00f3n."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "secure@microsoft.com",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH",
          "baseScore": 6.7,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 5.9
      }
    ]
  },
  "weaknesses": [
    {
      "source": "secure@microsoft.com",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21302",
      "source": "secure@microsoft.com"
    }
  ]
}