# CVE-2016-7247: Secure Boot Component Security Feature Bypass Vulnerability

CVE-2016-7247 is fixed in 15 products on 1 platform, first by KB3198586, released November 8, 2016. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2016-7247
- Priority: Urgent
- CVSS: 6.2 (Important)
- EPSS: 0.0603
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Nov 8, 2016
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2016-7247

## Description

<p>A security feature bypass vulnerability exists when Windows Secure Boot improperly loads a boot policy that is affected by the vulnerability. An attacker who successfully exploited this vulnerability could disable code integrity checks, allowing test-signed executables and drivers to be loaded onto a target device.</p> <p>To exploit the vulnerability, an attacker who has physical access or Administrative rights to a target device could install an affected boot policy.</p> <p>The security update addresses the vulnerability by revoking affected boot policies in the firmware. The revocation protection level depends upon platform firmware. The Windows event channel Microsoft-Windows-Kernel-Boot may be used to determine the protection level provided. Note that an additional reboot is needed to view the event:</p> <ul> <li>Windows versions prior to Windows 10 do not log the event by default. You must enable “analytic” logging for this channel prior to installation of the patch.</li> <li>Windows versions 10 and higher log the event by default. Event ID 155 indicates baseline protection. Event ID 154 indicates enhanced protection.</li> </ul> <p>For systems that provide baseline protection, firmware updates from your OEM may be available that upgrade systems to enhanced protection.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1511 for 32-bit Systems |  | [KB3198586](https://patchblox.com/security/data/fix/microsoft/kb3198586.md) | Nov 8, 2016 |
| Microsoft | Windows 10 Version 1511 for x64-based Systems |  | [KB3198586](https://patchblox.com/security/data/fix/microsoft/kb3198586.md) | Nov 8, 2016 |
| Microsoft | Windows 10 Version 1607 for 32-bit Systems |  | [KB3200970](https://patchblox.com/security/data/fix/microsoft/kb3200970.md) | Nov 8, 2016 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems |  | [KB3200970](https://patchblox.com/security/data/fix/microsoft/kb3200970.md) | Nov 8, 2016 |
| Microsoft | Windows 10 for 32-bit Systems | 10240.17190 | [KB3198585](https://patchblox.com/security/data/fix/microsoft/kb3198585.md) | Nov 8, 2016 |
| Microsoft | Windows 10 for x64-based Systems | 10240.17190 | [KB3198585](https://patchblox.com/security/data/fix/microsoft/kb3198585.md) | Nov 8, 2016 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB3197873](https://patchblox.com/security/data/fix/microsoft/kb3197873.md) | Nov 8, 2016 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB3197874](https://patchblox.com/security/data/fix/microsoft/kb3197874.md) | Nov 8, 2016 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB3197873](https://patchblox.com/security/data/fix/microsoft/kb3197873.md) | Nov 8, 2016 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB3197874](https://patchblox.com/security/data/fix/microsoft/kb3197874.md) | Nov 8, 2016 |
| Microsoft | Windows RT 8.1 |  | [KB3197874](https://patchblox.com/security/data/fix/microsoft/kb3197874.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 |  | [KB3197877](https://patchblox.com/security/data/fix/microsoft/kb3197877.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 |  | [KB3197876](https://patchblox.com/security/data/fix/microsoft/kb3197876.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB3197877](https://patchblox.com/security/data/fix/microsoft/kb3197877.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB3197876](https://patchblox.com/security/data/fix/microsoft/kb3197876.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 R2 |  | [KB3197873](https://patchblox.com/security/data/fix/microsoft/kb3197873.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 R2 |  | [KB3197874](https://patchblox.com/security/data/fix/microsoft/kb3197874.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB3197873](https://patchblox.com/security/data/fix/microsoft/kb3197873.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB3197874](https://patchblox.com/security/data/fix/microsoft/kb3197874.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2016 |  | [KB3200970](https://patchblox.com/security/data/fix/microsoft/kb3200970.md) | Nov 8, 2016 |
| Microsoft | Windows Server 2016 (Server Core installation) |  | [KB3200970](https://patchblox.com/security/data/fix/microsoft/kb3200970.md) | Nov 8, 2016 |

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