Pierluigi Paganini January 09, 2019

Microsoft has released the January 2019 Patch Tuesday updates that address 51 vulnerabilities in Windows OSs and other products.

Microsoft has released Microsoft January 2019 Patch Tuesday that solve 51 vulnerabilities in Windows operating system and in the following solutions:

• Adobe Flash Player
• Internet Explorer
• Microsoft Edge
• Microsoft Windows
• Microsoft Office and Microsoft Office Services and Web Apps
• ChakraCore
• .NET Framework
• ASP.NET
• Microsoft Exchange Server
• Microsoft Visual Studio

A close look at the list of issues addressed with the Microsoft January 2019 Patch Tuesday reveals that 7 flaws are rated critical, none was exploited in attacks in the wild.

The vulnerabilities rated as critical could be exploited by attackers for remote code execution, most of them affect Windows 10 and Server editions.

Three out of seven critical issues affect the ChakraCore scripting engine in the Edge browser, two affect Microsoft’s Hyper-V server virtualization environment, one impacts Edge, and one affects the Windows DHCP client.

The CVE-2019-0547 vulnerability resides in the Mitch Adair of the Microsoft Windows Enterprise Security Team, it could be exploited by an attacker to send a specially crafted DHCP response to a client in order to perform arbitrary code execution.

“A memory corruption vulnerability exists in the Windows DHCP client when an attacker sends specially crafted DHCP responses to a client. An attacker who successfully exploited the vulnerability could run arbitrary code on the client machine.” reads the security advisory.

“To exploit the vulnerability, an attacker could send a specially crafted DHCP responses to a client. The security update addresses the vulnerability by correcting how Windows DHCP clients handle certain DHCP responses.”

Other two Windows Hyper-V vulnerabilities (CVE-2019-0550 & CVE-2019-0551) can lead to remotely execute code on the host.

“A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system.” reads the security advisory related to the
CVE-2019-055 issue. “To exploit the vulnerability, an attacker could run a specially crafted application on a guest operating system that could cause the Hyper-V host operating system to execute arbitrary code.”

Only one of the issues addressed with Microsoft January 2019 Patch Tuesday that resides in the Microsoft JET Database Engine was publicly known, but it was not exploited in the wild.
The flaw tracked as CVE-2019-0579 and rated as important could be exploited to execute arbitrary code on a target’s system by tricking users into opening a specially-crafted file.

The tech giant also fixed a vulnerability in Skype for Android (CVE-2019-0622) that could have allowed a local attacker with physical access to an Android device to bypass the lock screen and potentially expose victim’s data.

Below there is the full list of vulnerabilities addressed by the Microsoft January 2019 Patch Tuesday.

Pierluigi Paganini

(SecurityAffairs –  Cybersecurity, Microsoft January 2019 Patch Tuesday)

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