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

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Crowdsourced vs. Traditional Pen Testing
Alex Haynes, Chief Information Security Officer, CDL,  3/19/2019
BEC Scammer Pleads Guilty
Dark Reading Staff 3/20/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
5 Emerging Cyber Threats to Watch for in 2019
Online attackers are constantly developing new, innovative ways to break into the enterprise. This Dark Reading Tech Digest gives an in-depth look at five emerging attack trends and exploits your security team should look out for, along with helpful recommendations on how you can prevent your organization from falling victim.
Flash Poll
The State of Cyber Security Incident Response
The State of Cyber Security Incident Response
Organizations are responding to new threats with new processes for detecting and mitigating them. Here's a look at how the discipline of incident response is evolving.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2018-18913
PUBLISHED: 2019-03-21
Opera before 57.0.3098.106 is vulnerable to a DLL Search Order hijacking attack where an attacker can send a ZIP archive composed of an HTML page along with a malicious DLL to the target. Once the document is opened, it may allow the attacker to take full control of the system from any location with...
CVE-2018-20031
PUBLISHED: 2019-03-21
A Denial of Service vulnerability related to preemptive item deletion in lmgrd and vendor daemon components of FlexNet Publisher version 11.16.1.0 and earlier allows a remote attacker to send a combination of messages to lmgrd or the vendor daemon, causing the heartbeat between lmgrd and the vendor ...
CVE-2018-20032
PUBLISHED: 2019-03-21
A Denial of Service vulnerability related to message decoding in lmgrd and vendor daemon components of FlexNet Publisher version 11.16.1.0 and earlier allows a remote attacker to send a combination of messages to lmgrd or the vendor daemon, causing the heartbeat between lmgrd and the vendor daemon t...
CVE-2018-20034
PUBLISHED: 2019-03-21
A Denial of Service vulnerability related to adding an item to a list in lmgrd and vendor daemon components of FlexNet Publisher version 11.16.1.0 and earlier allows a remote attacker to send a combination of messages to lmgrd or the vendor daemon, causing the heartbeat between lmgrd and the vendor ...
CVE-2019-3855
PUBLISHED: 2019-03-21
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.