# CVE-2016-7270: .NET Framework Information Disclosure Vulnerability

CVE-2016-7270 is fixed in 14 products on 1 platform, first by KB3206632, released December 13, 2016. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2016-7270
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.2332
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Dec 19, 2016
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2016-7270

## Description

<p>An information disclosure vulnerability exists in Microsoft .NET 4.6.2 Framework’s Data Provider for SQL Server that could allow an attacker to access information that should be defended by the <a href="https://technet.microsoft.com/library/security/dn848375.aspx">Always Encrypted</a> feature. The vulnerability is caused when .NET Framework improperly uses a developer-supplied key. When this key is misused, it is also possible for access to data to be temporarily lost.</p> <p>To exploit the vulnerability, an attacker who can access the incorrectly encrypted data could attempt to decrypt the data using an easily guessable key.</p> <p>The security update addresses the vulnerability by correcting the way .NET Framework handles the developer-supplied key, and thus properly defends the data.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows 10 Version 1607 for 32-bit Systems |  | [KB3206632](https://patchblox.com/security/data/fix/microsoft/kb3206632.md) | Dec 13, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows 10 Version 1607 for x64-based Systems |  | [KB3206632](https://patchblox.com/security/data/fix/microsoft/kb3206632.md) | Dec 13, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows 7 for 32-bit Systems Service Pack 1 |  | [KB3204805](https://patchblox.com/security/data/fix/microsoft/kb3204805.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows 7 for x64-based Systems Service Pack 1 |  | [KB3204805](https://patchblox.com/security/data/fix/microsoft/kb3204805.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows 8.1 for 32-bit systems |  | [KB3204802](https://patchblox.com/security/data/fix/microsoft/kb3204802.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows 8.1 for x64-based systems |  | [KB3204802](https://patchblox.com/security/data/fix/microsoft/kb3204802.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB3204805](https://patchblox.com/security/data/fix/microsoft/kb3204805.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB3204805](https://patchblox.com/security/data/fix/microsoft/kb3204805.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2012 |  | [KB3204801](https://patchblox.com/security/data/fix/microsoft/kb3204801.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2012 (Server Core installation) |  | [KB3204801](https://patchblox.com/security/data/fix/microsoft/kb3204801.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2012 R2 |  | [KB3204802](https://patchblox.com/security/data/fix/microsoft/kb3204802.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2012 R2 (Server Core installation) |  | [KB3204802](https://patchblox.com/security/data/fix/microsoft/kb3204802.md) | Dec 19, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2016 |  | [KB3206632](https://patchblox.com/security/data/fix/microsoft/kb3206632.md) | Dec 13, 2016 |
| Microsoft | Microsoft .NET Framework 4.6.2 on Windows Server 2016  (Server Core installation) |  | [KB3206632](https://patchblox.com/security/data/fix/microsoft/kb3206632.md) | Dec 13, 2016 |

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