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

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
7 Truths About BEC Scams
Ericka Chickowski, Contributing Writer,  6/13/2019
DNS Firewalls Could Prevent Billions in Losses to Cybercrime
Curtis Franklin Jr., Senior Editor at Dark Reading,  6/13/2019
Cognitive Bias Can Hamper Security Decisions
Kelly Sheridan, Staff Editor, Dark Reading,  6/10/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Building and Managing an IT Security Operations Program
As cyber threats grow, many organizations are building security operations centers (SOCs) to improve their defenses. In this Tech Digest you will learn tips on how to get the most out of a SOC in your organization - and what to do if you can't afford to build one.
Flash Poll
The State of IT Operations and Cybersecurity Operations
The State of IT Operations and Cybersecurity Operations
Your enterprise's cyber risk may depend upon the relationship between the IT team and the security team. Heres some insight on what's working and what isn't in the data center.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2019-12855
PUBLISHED: 2019-06-16
In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.
CVE-2013-7472
PUBLISHED: 2019-06-15
The "Count per Day" plugin before 3.2.6 for WordPress allows XSS via the wp-admin/?page=cpd_metaboxes daytoshow parameter.
CVE-2019-12839
PUBLISHED: 2019-06-15
In OrangeHRM 4.3.1 and before, there is an input validation error within admin/listMailConfiguration (txtSendmailPath parameter) that allows authenticated attackers to achieve arbitrary command execution.
CVE-2019-12840
PUBLISHED: 2019-06-15
In Webmin through 1.910, any user authorized to the "Package Updates" module can execute arbitrary commands with root privileges via the data parameter to update.cgi.
CVE-2019-12835
PUBLISHED: 2019-06-15
formats/xml.cpp in Leanify 0.4.3 allows for a controlled out-of-bounds write in xml_memory_writer::write via characters that require escaping.