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

11/12/2019
05:00 PM
Connect Directly
Twitter
LinkedIn
Google+
RSS
E-Mail
50%
50%

Microsoft Patches IE Zero-Day Among 74 Vulnerabilities

The November Patch Tuesday update fixed 13 critical flaws, including a zero-day bug in Internet Explorer.

Patch Tuesday is back once again, bringing with it 74 security fixes, 61 of which are classified as Important and 13 as Critical, including one Internet Explorer bug under active attack.

Microsoft today released fixes for CVEs across Windows, Internet Explorer, Microsoft Edge, Office and Office 365, ChakraCore, Exchange Server, Open Source Software, and Visual Studio.

The vulnerability currently being exploited in the wild is CVE-2019-1429, a scripting engine memory corruption vulnerability in Internet Explorer. A remote code execution flaw exists in the way the scripting engine handles objects in memory in IE, and it could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user.

Attackers who successfully exploited this vulnerability could gain the same user rights as the current user. If the user is logged in with administrator privileges, the attackers could exploit the vulnerability to take control of an affected system. From there, they could install programs; view, edit, or delete data; or create new accounts with full user rights.

To do this, the attackers could host a website designed to exploit the bug through Internet Explorer and convince the target to visit the site. Alternatively, they could embed an ActiveX control labeled "safe for initialization" within an app or Office document that hosts the IE rendering engine and trick someone into opening it. In the latter scenario, the victim wouldn't need to use IE to be infected, meaning they should patch even if they don't rely on the browser.

Today's patch fixes the flaw, reported by Clément Lecigne of Google's Threat Analysis Group, by changing the way the Internet Explorer scripting engine handles objects in memory.

"Security training on common phishing and user-targeted attack methods could further reduce the risk of this vulnerability being exploited, but as it is already being exploited in the wild, it is highly recommended to get the patch rolled out quickly to resolve the vulnerability completely," says Chris Goettl, director of security product management at Ivanti.

Microsoft also patched four Critical flaws (CVE-2019-1389, CVE-2019-1397, CVE-2019-1398, CVE-2019-0721) in Hyper-V and Hyper-V Network Switch. These would enable an authenticated user on a guest system to run potentially malicious code on the host. "Microsoft notes that exploitation of these vulnerabilities is less likely, but these patches should still be prioritized for all Hyper-V systems," says Jimmy Graham, director of product management at Qualys.

Today's roundup included a fix for CVE-2019-1457, a security feature bypass bug that exists in Office for Mac due to improper enforcement of macro settings in Excel files. To exploit this, an attacker would have to embed a control in an Excel worksheet that specifies a macro should be run, and then convince a user to open a specially crafted file with an affected version of Excel. This update fixes the vulnerability by enforcing macro settings on Excel documents.

Also worth noting is Microsoft's advisory ADV190024 on a vulnerability in certain Trusted Platform Module (TPM) chipsets from STMicroelectronics. This is a TPM firmware flaw, not a vulnerability in the Windows operating system or any specific application. The vulnerability affects key confidentiality in the ECDSA cipher; a firmware update to TPM may be needed.

"Currently no Windows systems use the vulnerable algorithm," Microsoft says. "Other software or services you are running might use this algorithm. Therefore if your system is affected and requires the installation of TPM firmware updates, you might need to re-enroll in security services you are running to remediate those affected services."

Related Content:

Check out The Edge, Dark Reading's new section for features, threat data, and in-depth perspectives. Today's top story: "Account Fraud Harder to Detect as Criminals Move from Bots to 'Sweat Shops'"

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
COVID-19: Latest Security News & Commentary
Dark Reading Staff 5/22/2020
How an Industry Consortium Can Reinvent Security Solution Testing
Henry Harrison, Co-founder & Chief Technology Officer, Garrison,  5/21/2020
Is Zero Trust the Best Answer to the COVID-19 Lockdown?
Dan Blum, Cybersecurity & Risk Management Strategist,  5/20/2020
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
How Cybersecurity Incident Response Programs Work (and Why Some Don't)
This Tech Digest takes a look at the vital role cybersecurity incident response (IR) plays in managing cyber-risk within organizations. Download the Tech Digest today to find out how well-planned IR programs can detect intrusions, contain breaches, and help an organization restore normal operations.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-13485
PUBLISHED: 2020-05-25
The Knock Knock plugin before 1.2.8 for Craft CMS allows IP Whitelist bypass via an X-Forwarded-For HTTP header.
CVE-2020-13486
PUBLISHED: 2020-05-25
The Knock Knock plugin before 1.2.8 for Craft CMS allows malicious redirection.
CVE-2020-13482
PUBLISHED: 2020-05-25
EM-HTTP-Request 1.1.5 uses the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.
CVE-2020-13458
PUBLISHED: 2020-05-25
An issue was discovered in the Image Resizer plugin before 2.0.9 for Craft CMS. There are CSRF issues with the log-clear controller action.
CVE-2020-13459
PUBLISHED: 2020-05-25
An issue was discovered in the Image Resizer plugin before 2.0.9 for Craft CMS. There is stored XSS in the Bulk Resize action.