What We Do
How we do it
Resources
Company
ABOUT ESENTIRE
About Us
eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1500+ organizations in 80+ 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
Nov 07, 2022
Global Cybersecurity Leader eSentire Partners with InfoTrust to Deliver 24/7 Multi-Signal MDR and IR Services Across Australia
Waterloo, ON and Sydney, Australia – November 9, 2022 – eSentire, Inc., the Authority in Managed Detection and Response (MDR), today announced it has expanded its presence in Australia via a strategic partnership with InfoTrust. InfoTrust is a leading specialized cybersecurity provider that combines next-generation security controls, with the InfoTrust “Connective Tissue” of customer success,…
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

View Most Recent Blogs