BeyondTrust
  • Products
    Privileged Password Management
    Discover, manage, audit, and monitor privileged accounts
    Password Safe DevOps Secrets Safe
    Endpoint Privilege Management
    Manage privileges on Windows, Mac, Linux, and Unix endpoints
    Windows and Mac Unix and Linux Active Directory Bridge
    Secure Remote Access
    Centrally manage and secure remote access for service desks and vendors
    Remote Support Privileged Remote Access
    Use Cases and Industries
    See All Products
  • Resources

    Universal Privilege Management

    Our innovative Universal Privilege Management approach secures every user, asset, and session across your entire enterprise.

    Watch Video

    Learn

    Case Studies
    Competitor Comparisons
    Datasheets
    Glossary
    Product Demos
    Whitepapers

    Attend

    Events
    Go Beyond
    Training
    Webinars

    Support

    Changelog
    Professional Services
    Technical Documentation
  • Blog
  • Partners
  • Contact
  • Support
  • Services
  • Training
  • Events
  • Company

September 2019 Patch Tuesday

September 10, 2019

  • Blog
  • Archive

Welcome back to this month’s Patch Tuesday. Microsoft has published its monthly updates, fixing 79 vulnerabilities, 17 of which were rated as “Critical”. This is a slight drop from last month. Three vulnerabilities were publicly disclosed prior to patching, and two were being actively exploited in the wild. The two vulnerabilities being exploited in the wild were elevation of privilege vulnerabilities in the Windows Common Log File System Driver, and in the Windows kernel.

Internet Explorer and Edge

As usual, Internet Explorer and Edge contained multiple Critical vulnerabilities in their Chakra Scripting Engines. An attacker could exploit these vulnerabilities by luring a victim to a site hosting maliciously crafted content, or uploading malicious content to a compromised site. The attacker would have privileges equal to that of the current user, so administrators running the browser are at risk of a full system takeover. This is yet another reminder to exercise the principle of least privilege.

Windows Kernel

The Windows Kernel had multiple vulnerabilities patched, one of which was actively being exploited in the wild. To exploit this, an attacker would have to run a specially crafted application to leverage ws2ifsl.sys, more commonly known as winsock. A successful exploit would result in system privileges granted to an unprivileged user.

Windows Common Log File System Driver

The Windows CLFS is a high-performance, general-purpose log file subsystem that dedicated client applications can use and multiple clients can share to optimize log access. However, like any application, it is prone to memory mismanagement, and since it runs as an elevated process, it can be leveraged to take complete control over the system. Researchers at Qihoo 360 Vulcan Team discovered the exploit in the wild.

Windows Secure Boot Security Features

The Windows Secure Boot process protects the Windows kernel during bootup from malicious devices. A vulnerability in this process was patched that allowed an attacker to gain access to protected kernel memory. In order to exploit this vulnerability, an attacker would need to have physical access to the machine prior to the next system reboot. The fix prevents access to certain debugging options when Windows Secure Boot is enabled.

Adobe Flash Player

A returning familiar face, Adobe Flash Player comes bearing more vulnerabilities to be patched. The two patched vulnerabilities could allow for a remote attacker to execute arbitrary code with the security context of the current user. Given that Adobe Flash Player is on the way out of service, you may wish to simply uninstall the product and its plugins from your system.


Whitepapers

Microsoft Vulnerabilities Report 2021

Author, BeyondTrust Research Team

Stay Up To Date

Get the latest news, ideas, and tactics from BeyondTrust. You may unsubscribe at any time.

I agree to receive product related communications from BeyondTrust as detailed in the Privacy Policy, and I may manage my preferences or withdraw my consent at any time.

You May Also Be Interested In:

Whitepapers

Mapping BeyondTrust Solutions to the Identity, Credential, and Access Management (ICAM) Architecture

Whitepapers

Four Key Ways Governments Can Prepare for the Growing Ransomware Threat

Whitepapers

The Operational Technology (OT) Remote Access Challenge

BeyondTrust Logo
  • Facebook
  • Twitter
  • LinkedIn

Keep up with BeyondTrust

I agree to receive product related communications from BeyondTrust as detailed in the Privacy Policy, and I may manage my preferences or withdraw my consent at any time.

Customer Support
Contact Sales

Products

  • Endpoint Privilege Management
  • Password Management
  • Privileged Remote Access
  • DevOps Secrets Safe
  • Remote Support

Resources

  • Blog
  • Case Studies
  • Competitor Comparisons
  • Datasheets
  • Glossary
  • Videos
  • Webcasts
  • Whitepapers

About

  • Company
  • Careers
  • Contact
  • Events
  • Leadership Team
  • Partner Program
  • Press

Languages

  • English
  • German
  • French
  • Spanish
  • Korean
  • Portuguese
  • Japanese
  • Privacy
  • Security
  • Manage Cookies
  • WEEE Compliance

Copyright © 1999 — 2020 BeyondTrust Corporation. All rights reserved. Other trademarks identified on this page are owned by their respective owners. BeyondTrust Corporation is not a chartered bank or trust company, or depository institution. It is not authorized to accept deposits or trust accounts and is not licensed or regulated by any state or federal banking authority.