Microsoft released April 2020 security updates on Tuesday that fix 113 vulnerabilities ranging from simple spoofing attacks to remote code execution in various products, including Android App, Apps, Microsoft Dynamics, Microsoft Graphics Component, Microsoft JET Database Engine, Microsoft Office, Microsoft Office SharePoint, Microsoft Scripting Engine, Microsoft Windows, Microsoft Windows DNS, Open Source Software, Remote Desktop Client, Visual Studio, Windows Defender, Windows Hyper-V, Windows Kernel, Windows Media, and Windows Update Stack.
Description of Critical Vulnerabilities
Microsoft’s April patches fix 17 critical vulnerabilities, which are described as follows:
Microsoft Graphics Remote Code Execution Vulnerability
This vulnerability is due to the improper handling of crafted embedded fonts by Windows’ font library and can be exploited in various ways.
In a web-based scenario, an attacker could exploit this vulnerability by tricking a user into accessing a crafted website. In a file-sharing scenario, an attacker could exploit this vulnerability by convincing users to open a crafted document.
Microsoft Graphics Components Remote Code Execution Vulnerability
A remote code execution vulnerability exists in the way that Microsoft Graphics Components handle objects in memory. This vulnerability could be triggered only when a user opens a crafted file. An attacker who successfully exploited the vulnerability could execute arbitrary code on a target system.
- CVE-2020-0929, CVE-2020-0931, and CVE-2020-0932
Microsoft SharePoint Remote Code Execution Vulnerability
Exploitation of these vulnerabilities requires that a user upload a specially crafted SharePoint application package to an affected version of SharePoint. An attacker who successfully exploited these vulnerabilities could execute arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.
- CVE-2020-0938 and CVE-2020-1020
Windows Adobe Font Manager Library Code Execution Vulnerability
Microsoft Windows is prone to a remote code execution vulnerability when the Windows Adobe Type Manager Library improperly handles a specially crafted multi-master font — Adobe Type 1 PostScript format.
For all systems except Windows 10, an attacker who successfully exploited these vulnerabilities could execute code remotely. For systems running Windows 10, an attacker who successfully exploited these vulnerabilities could execute code in an AppContainer sandbox context with limited privileges and capabilities.
In Internet Explorer, a remote code execution vulnerability exists in the way that the scripting engine handles objects in memory.
The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user.
- CVE-2020-0970 and CVE-2020-0969
A remote code execution vulnerability exists in the way that the ChakraCore/Chakra scripting engine handles objects in memory. Affecting Microsoft Edge (HTML-based), these vulnerabilities could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user.
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