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This security update resolves vulnerabilities in Microsoft .NET Framework that could allow the following:
A Remote Code Execution vulnerability in .NET Framework software if the software does not check the source markup of a file. An attacker who successfully exploits the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on by using administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts that have full user rights. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who have administrative user rights.
Exploitation of the vulnerability requires a user to open a specially crafted file that has an affected version of .NET Framework. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file.
This security update addresses the vulnerability by correcting how .NET Framework checks the source markup of a file.
To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-0613.
A vulnerability in certain .NET Framework APIs that parse URLs. An attacker who successfully exploits this vulnerability could use it to bypass security logic that's intended to make sure that a user-provided URL belonged to a specific host name or a subdomain of that host name. This could be used to cause privileged communication to be made to an untrusted service as if it were a trusted service.
To exploit the vulnerability, an attacker must provide a URL string to an application that tries to verify that the URL belongs to a specific host name or to a subdomain of that host name. The application must then make an HTTP request to the attacker-provided URL either directly or by sending a processed version of the attacker-provided URL to a web browser.
To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2019-0657.
Important
For more information about this update as it relates to Windows 8.1 and Windows Server 2012 R2, see the following article in the Microsoft Knowledge Base:
4487123 Security Only updates for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 8.1 and Server 2012 R2 (KB 4487123)
To get the standalone package for this update, go to the Microsoft Update Catalog.
On your WSUS server, follow these steps:
The updates are now available for installation through WSUS.
For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:
20190212 Security update deployment information: February 12, 2019
Note We do not recommend that you remove any security update. To remove this update, use the Programs and Features item in Control Panel.
This update does not require a system restart after you apply it unless files that are being updated are locked or are being used.
| File name | SHA1 hash | SHA256 hash |
|---|---|---|
| Windows8.1-KB4483484-x86.msu | DEF3F76A782382630D39B282BA66F2531BC2F873 | 7CD532FDDF1CA8D4B198A7EC73E42B4A0CB3631201CAFF54C48780ADD01AC2A5 |
| Windows8.1-KB4483484-x64.msu | E9A7BCBC9F7011E45A8461A3EEE353F3D8FD4C0D | 0E4EFBD4D0F9429D557FE04A95A7F18A9FB277046D3494C59E1AAE2A88CBDC0E |
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