What We Do
How we do it
Resources
TRU INTELLIGENCE CENTER
Our Threat Response Unit (TRU) publishes security advisories, blogs, reports, industry publications and webinars based on its original research and the insights driven through proactive threat hunts.
View Threat Intelligence Resources →
SECURITY ADVISORIES
Jun 03, 2022
UPDATE: CVE-2022-26134 – Confluence Zero-Day Vulnerability
THE THREAT June 3rd Update: Atlassian has released security patches to address this vulnerability. On June 2nd, 2022, Atlassian disclosed a critical vulnerability impacting the Confluence…
Read More
View all Advisories →
Company
ABOUT ESENTIRE
About Us
eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1200+ organizations in 75+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
Read about how we got here
Leadership Work at eSentire
LATEST PRESS RELEASE
May 17, 2022
Cybersecurity Leader eSentire Continues Its Commitment to Rigorous Security Standards Earning PCI DSS Certification
Waterloo, ON, May 17, 2022 — eSentire, the Authority in Managed Detection and Response (MDR), maintains one of the most secure and robust IT environments of any MDR provider in the industry. To that end, eSentire today announced that it has received the Payment Card Industry Data Security Standard (PCI DSS) certification, considered one of the most stringent and comprehensive payment card…
Read More
Partners
PARTNER PROGRAM
e3 Ecosystem
We provide sophisticated cybersecurity solutions for Managed Security Service Providers (MSSPs), Managed Service Providers (MSPs), and Value-Added Resellers (VARs). Find out why you should partner with eSentire, the Authority in Managed Detection and Response, today.
Learn more
ECOSYSTEM PARTNER RESOURCES
Apply to become an e3 ecosystem partner with eSentire, the Authority in Managed Detection and Response.
Login to the Partner Portal for resources and content for current partners.
Search
Resources
Security advisories — Jul 23, 2021

Windows Local Privilege Escalation Vulnerability - CVE-2021-36934

1 minute read
Speak With A Security Expert Now

THE THREAT

Microsoft has announced a high severity vulnerability impacting multiple versions of the Windows 10 operating system. The vulnerability is tracked as CVE-2021-36934 and is alternatively referred to as HiveNightmare and SeriousSAM. It is a Local Privilege Escalation (LPE) vulnerability; exploitation may allow a previously authenticated threat actor the ability to escalate their privileges on a vulnerable device and potentially install programs, change or delete data, or create new user accounts. Microsoft has not released security patches for this vulnerability. Organizations are strongly recommended to apply the relevant mitigations until security patches are made available.

What we’re doing about it

What you should do about it

Additional information

HiveNightmare impacts all versions of Windows 10 since version 1809, released October 17th, 2017. Proof-of-Concept (PoC) exploit code for this vulnerability is publicly available, but currently only allows for Denial-of-Service (DoS) attacks. It is highly likely that threat actors will alter the PoC code and employ it in real world attacks in the immediate future. As exploitation requires previous compromise, organizations are recommended to ensure that an endpoint monitoring solution is widely deployed in order to identify threat actor initial access attempts. 

Mitigations from Microsoft:

  1. Restrict access to the contents of %windir%\system32\config
    1. Command Prompt (Run as administrator): icacls %windir%\system32\config\*.* /inheritance:e
    2. Windows PowerShell (Run as administrator): icacls $env:windir\system32\config\*.* /inheritance:e
  2. Delete Volume Shadow Copy Service (VSS) shadow copies
    1. Delete any System Restore points and Shadow volumes that existed prior to restricting access to %windir%\system32\config
    2. Create a new System Restore point (if desired) 

References: 
[1] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934

Join 100,000+ Security Leaders

Get notified when there's a new security advisory, and receive the latest news, intel and helpful tools & assets. You can unsubscribe anytime.

By clicking the button below I confirm that I have read and agree to the eSentire privacy policy.

View Most Recent Blogs