Hacker News

Microsoft Issues Patches for 2 Bugs Exploited as Zero-Day in the Wild

Windows Update

It’s April 2020 Patch Tuesday, and during these challenging times of coronavirus pandemic, this month’s patch management process would not go easy for many organizations where most of the resources are working remotely.

Microsoft today released the latest batch of software security updates for all supported versions of its Windows operating systems and other products that patch a total of 113 new security vulnerabilities, 17 of which are critical and 96 rated important in severity.

Patches for 2 Zero-Days Exploited In the Wild

Most importantly, two of the security flaws have been reported as being publicly known at the time of release, and the two are being actively exploited in the wild by hackers.
One of the publicly disclosed flaws, which was also exploited as zero-day, resides in the Adobe Font Manager Library used by Windows, the existence of which Microsoft revealed last month within an early security warning for its millions of users.

Tracked as CVE-2020-1020, the remote code execution vulnerability exists in Microsoft Windows when the Windows Adobe Type Manager Library improperly handles a specially-crafted multi-master font – Adobe Type 1 PostScript format.

As explained in the previous post, the affected font library not only parses content when open with a 3rd-party software but also is used by Windows Explorer to display the content of a file in the ‘Preview Pane’ or ‘Details Pane’ without having users to open it.

The second in-the-wild exploited remote code execution flaw (CVE-2020-0938) also resides in the Adobe Type Manager Library that triggers when parsing a malicious OpenType font.

Both of these zero-day flaws were reported to Microsoft in the last week of March by researchers working with Google Project Zero but with a very short full disclosure deadline, which was then mutually extended considering the current global circumstances.

Other New Bugs Microsoft Patched this Month

The second publicly known issue, which was not exploited in the wild, is an important elevation of privilege vulnerability (CVE-2020-0935) that resides in the OneDrive for Windows desktop.

The latest update also includes patches for 5 critical flaws that affect Microsoft Office SharePoint, 4 of which exists due to the failure of the software to check the source markup of an application package, allowing remote attackers to execute arbitrary code on the affected machines.

Whereas, the 5th SharePoint flaw is a cross-site-scripting (XSS) issue (CVE-2020-0927) that can be exploited by an authenticated attacker by sending a specially crafted request to an affected SharePoint server.

There’s another notable flaw, tracked as CVE-2020-0910 and rated critical, that affects Windows Hyper-V, allowing a guest virtual machine to compromise the hypervisor, escaping from a guest virtual machine to the host, or escaping from one guest virtual machine to another guest virtual machine.

Besides these, other critical flaws Microsoft patched this month affect Chakra scripting engine, Microsoft Dynamics 365 Business Central, media foundation, graphics components, codecs library and VBScript—all leading to remote code execution attacks.

Windows users and system administrators are highly advised to apply the latest security patches as soon as possible in an attempt to keep cybercriminals and hackers away from taking control of their computers.

For installing the latest Windows security updates, you can head on to Settings → Update & Security → Windows Update → Check for updates on your PC, or you can install the updates manually.

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