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

4/9/2019
04:45 PM
Connect Directly
Twitter
LinkedIn
Google+
RSS
E-Mail
50%
50%

Microsoft Patch Tuesday Fixes Windows Bugs Under Attack

The April release of security updates patches 74 vulnerabilities, two of which are being exploited in the wild.

Microsoft today issued its April batch of security fixes, which patches 74 vulnerabilities including two Windows zero-days under active attack.

CVE-2019-0803 and CVE-2019-0859 both patch Windows elevation of privilege bugs found exploited in the wild. Microsoft describes both patches in a similar manner: In short, a vulnerability exists when the Win32k component doesn't properly handle objects in memory. An attacker could exploit this to run malicious code in kernel mode and install programs; view, change, or delete data; or create a new account with full user rights.

If this sounds familiar, it's likely because last month's Patch Tuesday also addressed two zero-day elevation-of-privilege vulnerabilities in Windows. Both were rated Important in severity, enabling an attacker with system access to increase their privileges and take over the system.

"This has been a trend in several Patch Tuesday releases, where researchers have reported Win32k elevation of privilege bugs leveraged by attackers as zero-days, which begs the question of just how many of these vulnerabilities attackers have stockpiled," notes Satnam Narang, senior research engineer at Tenable, in response to today's security updates.

As in March, one of these flaws (CVE-2019-0859) was reported by Kaspersky Lab. CVE-2019-0803 was found by the Alibaba Cloud Intelligence Security Team. Both are classified as Important in severity. There is no indication of how the bugs are being used in the wild; however, the discovery by Kaspersky Labs is a sign either or both could have been used in targeted malware.

Windows zero-days aside, a few other patches warrant attention to this month. One of these is CVE-2019-0853, a GDI+ remote code execution (RCE) bug categorized as Critical. A bug exists in how the Windows Graphic Design Interface handles objects in memory. Attackers who successfully exploit the bug could take over an affected system, and they could do so by tricking people into visiting a malicious website or downloading a bad attachment.

Several Microsoft products, including Windows and the Office suite, use the GDI+ component. Given how this bug can be exploited remotely, security admins are advised to prioritize this one when rolling out updates.

Among the other remote code execution vulnerabilities patched this month is CVE-2019-0822, an RCE flaw that exists in the way the Microsoft Graphics Components handle objects in memory. To exploit it, an attacker could send the victim a specially crafted file. There are also a handful of RCE bugs (CVE-2019-0824, CVE-2019-0825, CVE-2019-0826, CVE-2019-0827) that exist when Microsoft Office Access Connectivity Engine improperly handles objects in memory.

Related Content:

 

 

 

Join Dark Reading LIVE for two cybersecurity summits at Interop 2019. Learn from the industry's most knowledgeable IT security experts. Check out the Interop agenda here.

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
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
7 Threats & Disruptive Forces Changing the Face of Cybersecurity
This Dark Reading Tech Digest gives an in-depth look at the biggest emerging threats and disruptive forces that are changing the face of cybersecurity today.
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-2019-11559
PUBLISHED: 2019-09-17
A reflected Cross-site scripting (XSS) vulnerability in HRworks V 1.16.1 allows remote attackers to inject arbitrary web script or HTML via the URL parameter to the Login component.
CVE-2019-15729
PUBLISHED: 2019-09-17
An issue was discovered in GitLab Community and Enterprise Edition 8.18 through 12.2.1. An internal endpoint unintentionally disclosed information about the last pipeline that ran for a merge request.
CVE-2016-10983
PUBLISHED: 2019-09-17
The ghost plugin before 0.5.6 for WordPress has no access control for wp-admin/tools.php?ghostexport=true downloads of exported data.
CVE-2016-10984
PUBLISHED: 2019-09-17
The echosign plugin before 1.2 for WordPress has XSS via the inc.php page parameter.
CVE-2016-10985
PUBLISHED: 2019-09-17
The echosign plugin before 1.2 for WordPress has XSS via the templates/add_templates.php id parameter.