# CVE-2018-8417: Microsoft JScript Security Feature Bypass Vulnerability

CVE-2018-8417 is fixed in 21 products on 1 platform, first by KB4467691, released November 13, 2018. 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-2018-8417
- Priority: Urgent
- CVSS: 4.5 (Important)
- EPSS: 0.0202
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Nov 13, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8417

## Description

<p>A security feature bypass vulnerability exists in Microsoft JScript that could allow an attacker to bypass Device Guard.</p> <p>To exploit the vulnerability, an attacker would first have to access the local machine, and run a specially crafted application to create arbitrary COM objects.</p> <p>The update addresses the vulnerability by correcting how Microsoft JScript manages COM object creation.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.2608 | [KB4467691](https://patchblox.com/security/data/fix/microsoft/kb4467691.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.2608 | [KB4467691](https://patchblox.com/security/data/fix/microsoft/kb4467691.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.1446 | [KB4467696](https://patchblox.com/security/data/fix/microsoft/kb4467696.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.1446 | [KB4467696](https://patchblox.com/security/data/fix/microsoft/kb4467696.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.785 | [KB4467686](https://patchblox.com/security/data/fix/microsoft/kb4467686.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.785 | [KB4467686](https://patchblox.com/security/data/fix/microsoft/kb4467686.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.785 | [KB4467686](https://patchblox.com/security/data/fix/microsoft/kb4467686.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.407 | [KB4467702](https://patchblox.com/security/data/fix/microsoft/kb4467702.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.407 | [KB4467702](https://patchblox.com/security/data/fix/microsoft/kb4467702.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.407 | [KB4467702](https://patchblox.com/security/data/fix/microsoft/kb4467702.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.134 | [KB4467708](https://patchblox.com/security/data/fix/microsoft/kb4467708.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.134 | [KB4467708](https://patchblox.com/security/data/fix/microsoft/kb4467708.md) | Nov 13, 2018 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.134 | [KB4467708](https://patchblox.com/security/data/fix/microsoft/kb4467708.md) | Nov 13, 2018 |
| Microsoft | Windows 10 for 32-bit Systems | 10240.18036 | [KB4467680](https://patchblox.com/security/data/fix/microsoft/kb4467680.md) | Nov 13, 2018 |
| Microsoft | Windows 10 for x64-based Systems | 10240.18036 | [KB4467680](https://patchblox.com/security/data/fix/microsoft/kb4467680.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2016 | 14393.2608 | [KB4467691](https://patchblox.com/security/data/fix/microsoft/kb4467691.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.2608 | [KB4467691](https://patchblox.com/security/data/fix/microsoft/kb4467691.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2019 | 17763.134 | [KB4467708](https://patchblox.com/security/data/fix/microsoft/kb4467708.md) | Nov 13, 2018 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.134 | [KB4467708](https://patchblox.com/security/data/fix/microsoft/kb4467708.md) | Nov 13, 2018 |
| Microsoft | Windows Server, version 1709  (Server Core Installation) | 16299.785 | [KB4467686](https://patchblox.com/security/data/fix/microsoft/kb4467686.md) | Nov 13, 2018 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.407 | [KB4467702](https://patchblox.com/security/data/fix/microsoft/kb4467702.md) | Nov 13, 2018 |

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