Welcome back to this month’s Patch Tuesday. This is the last Patch Tuesday of this decade, and it seems only fitting that a zero-day vulnerability that was actively being exploited in the wild was patched. In total there were 2 advisories and updates for 36 vulnerabilities this month. Of these vulnerabilities, 7 are classified as Critical, 27 as Important, 1 as Moderate, and 1 as Low.
Win32k
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory. An attacker exploiting this vulnerability would be able to elevate their privileges to kernel mode. This vulnerability was actively being exploited in the wild and was discovered by Kaspersky Labs. Microsoft has rated this vulnerability as Critical.
Microsoft Office
Microsoft’s Office applications come with a host of fixes this month. Attackers could gain access to sensitive information in Microsoft Access and Excel, and execute code remotely in PowerPoint with the security context of the current user. Microsoft rates these vulnerabilities as Important.
Microsoft Graphics Component
Microsoft’s handling of graphical objects comes under frequent attack since it runs in full kernel mode. In this case, embedded fonts are processed by the kernel. An attacker luring a victim to view content with a maliciously crafted embedded font could take total control of the system. Microsoft has rated this vulnerability (CVE-2019-1468) as Critical.
Visual Studio
Multiple vulnerabilities for Visual Studio’s Git component were patched that could have allowed for remote code execution. An attacker exploiting this vulnerability would execute code with security context of the current user. This is a reminder to yet again practice the principle of least privilege.
Hyper-V
Windows Hyper-V is vulnerable to a flaw in which code run on a guest operating system would be able to execute code on the host. This is particularly dangerous as it pertains to cloud environments using Hyper-V, since an attacker could potentially access virtualized machines belonging to others, and access or destroy everything on that particular host.
Research Team, BeyondTrust
Identity security threats are escalating at an alarming rate. Driven by the rapid evolution of technology, the increasing sophistication of malicious actors, and an ever-expanding attack surface, it is more important than ever that organizations adopt robust identity security measures that are capable of keeping pace ever-evolving attacks.
The BeyondTrust research and detection engineering teams believe the best way to fully understand cybersecurity threats is to work closely with our customers and partners, conducting real world research into the attacks that matter most to them. By dissecting emerging attack methods and exploitation techniques of threat actors as well as conducting novel research the teams mission is to help organizations defend against identity threats.