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
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 9/25/2020
Navigating the Asia-Pacific Threat Landscape: Experts Dive In
Kelly Sheridan, Staff Editor, Dark Reading,  9/25/2020
Safeguarding Schools Against RDP-Based Ransomware
James Lui, Ericom Group CTO, Americas,  9/28/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Special Report: Computing's New Normal
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
How IT Security Organizations are Attacking the Cybersecurity Problem
How IT Security Organizations are Attacking the Cybersecurity Problem
The COVID-19 pandemic turned the world -- and enterprise computing -- on end. Here's a look at how cybersecurity teams are retrenching their defense strategies, rebuilding their teams, and selecting new technologies to stop the oncoming rise of online attacks.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-26120
PUBLISHED: 2020-09-27
XSS exists in the MobileFrontend extension for MediaWiki before 1.34.4 because section.line is mishandled during regex section line replacement from PageGateway. Using crafted HTML, an attacker can elicit an XSS attack via jQuery's parseHTML method, which can cause image callbacks to fire even witho...
CVE-2020-26121
PUBLISHED: 2020-09-27
An issue was discovered in the FileImporter extension for MediaWiki before 1.34.4. An attacker can import a file even when the target page is protected against "page creation" and the attacker should not be able to create it. This occurs because of a mishandled distinction between an uploa...
CVE-2020-25812
PUBLISHED: 2020-09-27
An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.
CVE-2020-25813
PUBLISHED: 2020-09-27
In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, Special:UserRights exposes the existence of hidden users.
CVE-2020-25814
PUBLISHED: 2020-09-27
In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, XSS related to jQuery can occur. The attacker creates a message with [javascript:payload xss] and turns it into a jQuery object with mw.message().parse(). The expected result is that the jQuery object does not contain an <a> ...