Security Only Update for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows 8.1 and Windows Server 2012 R2 (KB4570502)

2020-08-11T17:07:40
ID KB4570502
Type mskb
Reporter Microsoft
Modified 2020-08-11T17:07:40

Description

<html><body><p>Security Only Update for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows 8.1 and Windows Server 2012 R2 (KB4570502)</p><h2></h2><div class="alert-band"> <div class="alert alert-info" role="alert"> <p class="alert-title">Applies to:</p> <div class="row"> <div class="col-xs-24"> <p>Microsoft .NET Framework 3.5 Microsoft .NET Framework 4.5.2 Microsoft .NET Framework 4.6 Microsoft .NET Framework 4.6.1 Microsoft .NET Framework 4.6.2 Microsoft .NET Framework 4.7 Microsoft .NET Framework 4.7.1 Microsoft .NET Framework 4.7.2 Microsoft .NET Framework 4.8 </p> </div> </div> </div> </div><h2>Summary</h2><p> An elevation of privilege vulnerability exists when ASP.NET or .NET Framework web applications running on IIS improperly allow access to cached files. An attacker who successfully exploited this vulnerability could gain access to restricted files. To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server. The update addresses the vulnerability by changing how ASP.NET and .NET Framework handle requests. </p><p> To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE). </p><ul><li><a href="https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476" id="kb-link-2" target="_self">CVE-2020-1476</a></li></ul><p> A remote code execution vulnerability exists when Microsoft .NET Framework processes input. An attacker who successfully exploited this vulnerability could take control of an affected system. To exploit the vulnerability, an attacker would need to be able to upload a specially crafted file to a web application. The security update addresses the vulnerability by correcting how .NET Framework processes input. </p><p> For more information go to: <a href="https://go.microsoft.com/fwlink/?linkid=2138023">https://go.microsoft.com/fwlink/?linkid=2138023</a></p><p> To learn more about the vulnerabilities, go to the following Common Vulnerabilities and Exposures (CVE). </p><ul><li><a href="https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1046" id="kb-link-2" target="_self">CVE-2020-1046</a></li></ul><p>For a list of improvements that were released with this update, please see the article links in the Additional Information section of this article.</p><p> <strong> <span class="text-base">Important</span> </strong> </p><ul> <li> <span>As a reminder to advanced IT administrators, updates to .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2 should only be applied on systems where .NET Framework 3.5 is present and enabled. Customers who attempt to pre-install updates to .NET Framework 3.5 to offline images that do not contain the .NET Framework 3.5 product enabled will expose these systems to failures to enable .NET Framework 3.5 after the systems are online. For more extensive information about deploying .NET Framework 3.5, see </span> <a href="https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/microsoft-net-framework-35-deployment-considerations ">Microsoft .NET Framework 3.5 Deployment Considerations.</a> </li> <li> All updates for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 require that update KB 2919355 is installed. We recommend that you install update KB 2919355 on your Windows 8.1-based, Windows RT 8.1-based, or Windows Server 2012 R2-based computer so that you receive updates in the future. </li> <li> If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see <a bookmark-id="" data-content-id="" data-content-type="" href="https://technet.microsoft.com/en-us/library/hh825699" managed-link="" target="_blank">Add language packs to Windows</a>. </li> </ul><h2>Additional information about this update</h2><div> <span>The following articles contain additional information about this update as it relates to individual product versions.</span> </div><div></div><ul> <li> <span> <a href="https://support.microsoft.com/help/4569737" managed-link="">4569737</a> <span>Description of the Security Only Update for .NET Framework 3.5 for Windows 8.1 and Windows Server 2012 R2 (KB4569737)</span> </span> </li> <li> <span> <a href="https://support.microsoft.com/help/4569741" managed-link="">4569741</a> <span>Description of the Security Only Update for .NET Framework 4.5.2 for Windows 8.1 and Windows Server 2012 R2 (KB4569741)</span> </span> </li> <li> <span> <a href="https://support.microsoft.com/help/4569739" managed-link="">4569739</a> <span>Description of the Security Only Update for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows 8.1 and Windows Server 2012 R2 (KB4569739)</span> </span> </li> <li> <span> <a href="https://support.microsoft.com/help/4569732" managed-link="">4569732</a> <span>Description of the Security Only Update for .NET Framework 4.8 for Windows 8.1 and Windows Server 2012 R2 (KB4569732)</span> </span> </li> </ul><h2>Information about protection and security</h2><ul> <li> Protect yourself online: <a href="https://support.microsoft.com/hub/4099151/windows-security-help" originalsrc="https://support.microsoft.com/hub/4099151/windows-security-help" shash="RYy3LeXx+rmimVtQWgsOp2FdFIqw7JA//Q/gQk82okgjOsd4xXdoK0JeBzlEcm0ODcghLacwCQ7rq/te5MIy9rhRyjOI5z+tQLQ58N0ohXStVASL9xwW0nm7tWELhl8Vd+jYkRf314nXnEXaofpGgPwiR8IWSM1V+w57ooqQzME=" target="_blank">Windows Security support</a></li> <li> Learn how we guard against cyber threats: <a href="https://www.microsoft.com/security" originalsrc="https://www.microsoft.com/security" shash="Fb+Q8jcsMznGoXBaEpy7ItSNVM/ojkQHBsLDm3A6U1j8nU/EzgwX89Ox/pQeEuCbTUAIMz1KtFkOsv9oQSp0WSip1uNUHotfXevDx7dDk5kFn4u/io4q1ESXpDplQ989sCEmxdzRlhaLF3PHKXMoLlTmwS5dmeU5gGxfXDhL40w=">Microsoft Security</a></li> </ul></body></html>