Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Threat Intelligence

12/11/2018
05:40 PM
Connect Directly
Twitter
LinkedIn
Google+
RSS
E-Mail
100%
0%

Patch Tuesday Arrives with 9 Critical CVEs, 1 Under Attack

Serious bugs addressed today include a Win32K privilege escalation vulnerability and Windows DNS server heap overflow flaw.

Microsoft today released its December wave of Patch Tuesday updates, which amounted to less than 40 — a relatively small group, considering every other month brought more than 50 fixes.

Of the bugs patched today, nine are considered Critical and 30 deemed Important in severity. One was publicly known and another was under active attack. This month, Adobe also issued a patch for CVE-2019-15982, which attackers were actively exploiting via Microsoft Office files.

The vulnerability under attack is CVE-2018-8611, a Win32K elevation of privilege flaw reported by Kaspersky Lab researchers. This marks the third consecutive month Microsoft has patched a Win32K elevation of privilege vulnerability, reports Dustin Childs of Trend Micro's Zero Day Initiative. As with previous months, he explains, a Kaspersky Labs finding indicates the flaw is being used in malware; it's likely also being used in targeted attacks with other bugs.

This is one of the most important flaws, says Satnam Narang, senior research engineer at Tenable. While this vulnerability requires an attacker to have an established presence on a target system, he points out, security teams should still prioritize this when they update.

The publicly known bug is CVE-2018-8517, a denial-of-service vulnerability in web applications built with the .NET Framework, which was publicly disclosed before today but not exploited. Browser-related bugs make up 25% of all vulnerabilities addressed this month, Childs says.

Also worth noting is CVE-2018-8626, which is also among the most critical flaws patched this month. This is a remote code execution vulnerability against the Windows DNS server that could let an unauthenticated attacker run arbitrary code in the context of the LocalSystem Account by sending a malicious request to the server. "Since DNS servers are designed to handle requests, there's no other real defense beyond applying this patch," he adds.

"While most users don't have to worry about this vulnerability, as they are not exposing DNS services to the Internet, large corporations and Internet service providers that run public-facing DNS server should patch immediately," says Allan Liska, senior solutions architect at Recorded Future.

Server-side bugs also include SharePoint, Exchange Server 2016 (CVE-2018-8604), and Microsoft Dynamics NAV (CVE-2018-8651). Notable flaws on the client side affect Internet Explorer (CVE-2018-8631) and Microsoft Edge. Edge has five Critical bugs in the Chakra Core scripting engine; all are memory corruption bugs that enable remote code execution.

This is the 15th straight month that Microsoft has disclosed a flaw in the Chakra scripting engine, Liska points out. The last Patch Tuesday without a Chakra disclosure was September 2017.

Related Content:

Kelly Sheridan is the Staff Editor at Dark Reading, where she focuses on cybersecurity news and analysis. She is a business technology journalist who previously reported for InformationWeek, where she covered Microsoft, and Insurance & Technology, where she covered financial ... View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 8/3/2020
Pen Testers Who Got Arrested Doing Their Jobs Tell All
Kelly Jackson Higgins, Executive Editor at Dark Reading,  8/5/2020
New 'Nanodegree' Program Provides Hands-On Cybersecurity Training
Nicole Ferraro, Contributing Writer,  8/3/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
Special Report: Computing's New Normal, a Dark Reading Perspective
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
The Changing Face of Threat Intelligence
The Changing Face of Threat Intelligence
This special report takes a look at how enterprises are using threat intelligence, as well as emerging best practices for integrating threat intel into security operations and incident response. Download it today!
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-15820
PUBLISHED: 2020-08-08
In JetBrains YouTrack before 2020.2.6881, the markdown parser could disclose hidden file existence.
CVE-2020-15821
PUBLISHED: 2020-08-08
In JetBrains YouTrack before 2020.2.6881, a user without permission is able to create an article draft.
CVE-2020-15823
PUBLISHED: 2020-08-08
JetBrains YouTrack before 2020.2.8873 is vulnerable to SSRF in the Workflow component.
CVE-2020-15824
PUBLISHED: 2020-08-08
In JetBrains Kotlin before 1.4.0, there is a script-cache privilege escalation vulnerability due to kotlin-main-kts cached scripts in the system temp directory, which is shared by all users by default.
CVE-2020-15825
PUBLISHED: 2020-08-08
In JetBrains TeamCity before 2020.1, users with the Modify Group permission can elevate other users' privileges.