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.

Endpoint

8/29/2018
04:30 PM
Connect Directly
Twitter
LinkedIn
Google+
RSS
E-Mail
50%
50%

Windows Zero-Day Flaw Disclosed Via Twitter

Security experts confirm the privilege escalation vulnerability in Microsoft Windows still works.

A previously undisclosed zero-day vulnerability in Microsoft's Windows 10 operating system was published via Twitter this week.

SandboxEscaper, the user behind the Twitter account that exposed the vulnerability, first posted about the bug on Monday, Aug. 27 and linked to a proof-of-concept on GitHub. This is a local privilege escalation vulnerability, which exists in the Advanced Local Procedure Call (ALPC) interface within the Windows Task Manager, reports CERT vulnerability analyst Will Dormann.

An API in the Windows task scheduler contains a vulnerability in the handling of ALPC, and the bug could allow a local user to gain system privileges, Dormann explains in a CERT writeup on the vulnerability.

"We have confirmed that the public exploit code works on 64-bit Windows 10 and Windows Server 2016 systems," Dormann writes. "Compatibility with other Windows version may be possible with modification of the publicly-available exploit source code."

Dormann later posted his own tweet confirming the exploit works even if the Windows 10 64-bit system is fully patched; with minor tweaks, it works on 32-bit systems as well. He is currently unaware of any workaround.

The way this vulnerability was disclosed – with social media posts and a proof-of-concept published on GitHub – has captured the attention of the security community. However, as Synopsys principal scientist Sammy Migues points out, the discovery of a local privilege escalation flaw is "fairly common."

Average users running Windows machines with this vulnerability can exploit it to gain elevated privileges despite not being granted that level of access by IT admins, Migues explains. If they do, anyone who gains access to their device will have the same privileges, putting the device and its data at risk.

He also points out it is possible for remote attackers to exploit this vulnerability, which would typically require local access, if a local user executes the attacker's code via phishing email or downloading malicious software.

"Having a working exploit out in the world makes this easier for everyone," he continues. "A remote attacker would have to get someone to run their attack code," via a phishing attack, for example, he says.

Microsoft has not issued an emergency patch for the bug. The company, which neither confirmed nor denied the existence of this vulnerability, will release its next wave of monthly fixes on September's Patch Tuesday update, which will take place on Sept. 11.

"Windows has a customer commitment to investigate reported security issues, and proactively update impacted devices as soon as possible. Our standard policy is to provide solutions via our current Update Tuesday schedule," reported a Microsoft spokesperson.

Related Content:

 

Black Hat Europe returns to London Dec 3-6 2018  with hands-on technical Trainings, cutting-edge Briefings, Arsenal open-source tool demonstrations, top-tier security solutions and service providers in the Business Hall. Click for information on the conference and to register.

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
Can Your Patching Strategy Keep Up with the Demands of Open Source?
Tim Mackey, Principal Security Strategist, CyRC, at Synopsys,  6/18/2019
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-2019-2729
PUBLISHED: 2019-06-19
Vulnerability in the Oracle WebLogic Server component of Oracle Fusion Middleware (subcomponent: Web Services). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0 and 12.2.1.3.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise ...
CVE-2019-3737
PUBLISHED: 2019-06-19
Dell EMC Avamar ADMe Web Interface 1.0.50 and 1.0.51 are affected by an LFI vulnerability which may allow a malicious user to download arbitrary files from the affected system by sending a specially crafted request to the Web Interface application.
CVE-2019-3787
PUBLISHED: 2019-06-19
Cloud Foundry UAA, versions prior to 73.0.0, falls back to appending ?unknown.org? to a user's email address when one is not provided and the user name does not contain an @ character. This domain is held by a private company, which leads to attack vectors including password recovery emails sent to ...
CVE-2019-12900
PUBLISHED: 2019-06-19
BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.
CVE-2019-12893
PUBLISHED: 2019-06-19
Alternate Pic View 2.600 has a User Mode Write AV starting at PicViewer!PerfgrapFinalize+0x00000000000a8868.