# CVE-2020-0657: Windows Common Log File System Driver Elevation of Privilege Vulnerability

CVE-2020-0657 is fixed in 41 products on 1 platform, first by KB4537764, released February 11, 2020. 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-2020-0657
- Priority: Urgent
- CVSS: 7.8 (Important)
- EPSS: 0.0085
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Feb 11, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-0657

## Description

<p>An elevation of privilege vulnerability exists when the <a href="https://technet.microsoft.com/library/security/dn848375.aspx#CLFS">Windows Common Log File System (CLFS)</a> driver improperly handles objects in memory. An attacker who successfully exploited this vulnerability could run processes in an elevated context.</p> <p>To exploit the vulnerability, an attacker would first have to log on to the system, and then run a specially crafted application to take control over the affected system.</p> <p>The security update addresses the vulnerability by correcting how CLFS handles objects in memory.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.3504 | [KB4537764](https://patchblox.com/security/data/fix/microsoft/kb4537764.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.3504 | [KB4537764](https://patchblox.com/security/data/fix/microsoft/kb4537764.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.1686 | [KB4537789](https://patchblox.com/security/data/fix/microsoft/kb4537789.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.1686 | [KB4537789](https://patchblox.com/security/data/fix/microsoft/kb4537789.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.1686 | [KB4537789](https://patchblox.com/security/data/fix/microsoft/kb4537789.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.1304 | [KB4537762](https://patchblox.com/security/data/fix/microsoft/kb4537762.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.1304 | [KB4537762](https://patchblox.com/security/data/fix/microsoft/kb4537762.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1304 | [KB4537762](https://patchblox.com/security/data/fix/microsoft/kb4537762.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.1039 | [KB4532691](https://patchblox.com/security/data/fix/microsoft/kb4532691.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.1039 | [KB4532691](https://patchblox.com/security/data/fix/microsoft/kb4532691.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.1039 | [KB4532691](https://patchblox.com/security/data/fix/microsoft/kb4532691.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1903 for 32-bit Systems |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1903 for x64-based Systems |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1909 for 32-bit Systems |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1909 for ARM64-based Systems |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |
| Microsoft | Windows 10 Version 1909 for x64-based Systems |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |
| Microsoft | Windows 10 for 32-bit Systems | 10240.18486 | [KB4537776](https://patchblox.com/security/data/fix/microsoft/kb4537776.md) | Feb 11, 2020 |
| Microsoft | Windows 10 for x64-based Systems | 10240.18486 | [KB4537776](https://patchblox.com/security/data/fix/microsoft/kb4537776.md) | Feb 11, 2020 |
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB4537813](https://patchblox.com/security/data/fix/microsoft/kb4537813.md) | Feb 11, 2020 |
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB4537820](https://patchblox.com/security/data/fix/microsoft/kb4537820.md) | Feb 11, 2020 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB4537813](https://patchblox.com/security/data/fix/microsoft/kb4537813.md) | Feb 11, 2020 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB4537820](https://patchblox.com/security/data/fix/microsoft/kb4537820.md) | Feb 11, 2020 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB4537803](https://patchblox.com/security/data/fix/microsoft/kb4537803.md) | Feb 11, 2020 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB4537821](https://patchblox.com/security/data/fix/microsoft/kb4537821.md) | Feb 11, 2020 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB4537803](https://patchblox.com/security/data/fix/microsoft/kb4537803.md) | Feb 11, 2020 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB4537821](https://patchblox.com/security/data/fix/microsoft/kb4537821.md) | Feb 11, 2020 |
| Microsoft | Windows RT 8.1 |  | [KB4537821](https://patchblox.com/security/data/fix/microsoft/kb4537821.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB4537813](https://patchblox.com/security/data/fix/microsoft/kb4537813.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB4537820](https://patchblox.com/security/data/fix/microsoft/kb4537820.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB4537813](https://patchblox.com/security/data/fix/microsoft/kb4537813.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB4537820](https://patchblox.com/security/data/fix/microsoft/kb4537820.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB4537810](https://patchblox.com/security/data/fix/microsoft/kb4537810.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB4537822](https://patchblox.com/security/data/fix/microsoft/kb4537822.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB4537810](https://patchblox.com/security/data/fix/microsoft/kb4537810.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB4537822](https://patchblox.com/security/data/fix/microsoft/kb4537822.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB4537810](https://patchblox.com/security/data/fix/microsoft/kb4537810.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB4537822](https://patchblox.com/security/data/fix/microsoft/kb4537822.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB4537810](https://patchblox.com/security/data/fix/microsoft/kb4537810.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB4537822](https://patchblox.com/security/data/fix/microsoft/kb4537822.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 |  | [KB4537794](https://patchblox.com/security/data/fix/microsoft/kb4537794.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 |  | [KB4537814](https://patchblox.com/security/data/fix/microsoft/kb4537814.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB4537794](https://patchblox.com/security/data/fix/microsoft/kb4537794.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB4537814](https://patchblox.com/security/data/fix/microsoft/kb4537814.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 R2 |  | [KB4537803](https://patchblox.com/security/data/fix/microsoft/kb4537803.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 R2 |  | [KB4537821](https://patchblox.com/security/data/fix/microsoft/kb4537821.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4537803](https://patchblox.com/security/data/fix/microsoft/kb4537803.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB4537821](https://patchblox.com/security/data/fix/microsoft/kb4537821.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2016 | 14393.3504 | [KB4537764](https://patchblox.com/security/data/fix/microsoft/kb4537764.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.3504 | [KB4537764](https://patchblox.com/security/data/fix/microsoft/kb4537764.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2019 | 17763.1039 | [KB4532691](https://patchblox.com/security/data/fix/microsoft/kb4532691.md) | Feb 11, 2020 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.1039 | [KB4532691](https://patchblox.com/security/data/fix/microsoft/kb4532691.md) | Feb 11, 2020 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.1304 | [KB4537762](https://patchblox.com/security/data/fix/microsoft/kb4537762.md) | Feb 11, 2020 |
| Microsoft | Windows Server, version 1903 (Server Core installation) |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |
| Microsoft | Windows Server, version 1909 (Server Core installation) |  | [KB4532693](https://patchblox.com/security/data/fix/microsoft/kb4532693.md) | Feb 11, 2020 |

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