Microsoft Data Sharing Service Zero-Day Exploit Released on Twitter

Satnam Narang

Researcher discloses privilege escalation zero-day in Microsoft’s Data Sharing Service on Twitter and provides a proof-of-concept that could be used to deploy attacks in the wild.


On October 23, a privilege escalation zero-day vulnerability in Microsoft’s Data Sharing Service (dssvc.dll), a broker for sharing data between applications, was published to Twitter. The researcher who published this vulnerability also released a zero-day exploit in Microsoft’s Windows Task Scheduler on Twitter in August 2018. As with the Task Scheduler vulnerability disclosed previously, the researcher shared a proof-of-concept (PoC) on GitHub.

Vulnerability details

The PoC shared by the researcher deletes files on the system that normally require administrative privileges. By deleting these files, the PoC demonstrates the bug is capable of elevating privileges. The PoC could be modified by an attacker to perform other tasks that require elevated privileges.

Please be advised that the PoC deletes a critical system file which can render the system inoperable.

According to initial reports, this vulnerability affects Windows 10, Windows Server 2016 and Windows Server 2019 systems. Also note this vulnerability requires that a malicious actor already have presence on an infected system (using malicious software) or utilize a separate vulnerability to establish a presence on a targeted system.

Urgently required actions

It is unclear if Microsoft will issue a patch for this vulnerability in time for the next Security Update in November 2018. Until a patch is available, we strongly encourage utilizing best security practices. This includes mitigation strategies, as attackers are likely to use malware when deploying this vulnerability. Additionally, ensure proper access control and network segmentation is in place.

Tenable’s Security Response team will update this blog post with protection information as soon as a patch becomes available.

Get more information

Learn more about, the first Cyber Exposure platform for holistic management of your modern attack surface. Get a free 60-day trial of Vulnerability Management.

Read more >

Published on Oct 24, 2018

People also viewed

Technical Support Engineer

Columbia Maryland United States Columbia Gateway Drive, Columbia, Maryland, United States, 21046 Technical Support Technical Support
Your Role:Tenable is looking for motivated individuals to join our Technical Support Team. The Technical Support Engineer (TSE) is the first contact for all customers when they require technical assistance.  In a time when the next Spectre and Mel...

Customer Success Manager - APAC Nessus

Singapore Singapore Singapore North Bridge Road, Parkview Square, Singapore, 188788 Customer Success Sales
Your Role:Tenable has an immediate need for a Customer Success Manager who will be responsible for establishing and driving sales activities for our software products within a designated geography. You will be expected to penetrate and prospect na...

Sales Development Representative

Singapore Singapore Singapore North Bridge Road, Parkview Square, Singapore, 188788 Lead Generation Sales
Your Role:The Sales Development Representative supports remote sales teams in and is responsible for generating new business via inbound and outbound phone opportunity qualification. Your Opportunity: Perform outbound calling to generate new sales...

Security Engineer - Mexico

Mexico City Mexico Mexico Presidenta Masarik, Polanco V Seccion, Mexico City, Mexico, 21045 Sales Engineering Sales
Your Role:Tenable is seeking a Security Engineer to support demos and evaluations of enterprise opportunities across the territory. Assist in developing business value propositions around Tenable's products and solutions. Drives sales with technic...

Director of Engineering - Shared Services Infrastructure

Columbia Maryland United States Columbia Gateway Drive, Columbia, Maryland, United States, 21046 Sensors Engineering
Your Role:Tenable is looking for a talented and energetic Director of Software Engineering to lead the Shared Services Infrastructure (SSI) development team. The SSI team helps organizations address key challenges of traditional vulnerability scan...

Principal UX Designer

San Jose California United States E Santa Clara St., San Jose, California, United States, 95113 Cloud Platforms Engineering
Your Role:Tenable is looking for an extraordinary Principal UX Designer to join our team. Our group is chartered with creating the next generation of security products while at the same time pioneering unprecedented user experience in the digital ...

We have big plans for continued global growth, and we’re looking for people who are creative, flexible and dedicated to helping us build something great – something that matters.