What We Do
How we do it
Resources
SECURITY ADVISORIES
Oct 18, 2021
Grief Ransomware Gang Claims 41 New Victims, Targeting Manufacturers; Municipalities; & Service Companies in U.K. & Europe
Grief Operators Earned an Estimated 8.5 Million British Pounds in Four Months Key Findings: The Grief Ransomware Gang (a rebrand of the DoppelPaymer Ransomware Group) claims to have infected 41 new victims between May 27, 2021—Oct. 1, 2021 with their ransomware.Over half the companies listed on Grief’s underground leak site are based in the U.K. and Europe. The Grief Ransomware Gang appears to…
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 1000+ organizations in 70+ 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
Oct 12, 2021
eSentire Launches MDR with Microsoft Azure Sentinel Extending Response Capabilities Across Entire Microsoft Security Ecosystem
Waterloo, ON – Oct. 12, 2021 -- eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announced the expansion of its award-winning MDR services with Microsoft Azure Sentinel, as part of its integration with the complete Microsoft 365 Defender and Azure Defender product suites supporting Microsoft SIEM, endpoint, identity, email and cloud security services.…
Read More
Partners
PARTNER PROGRAM
Partners
Our award-winning partner program offers financial rewards, sales and marketing tools and personalized training. Accelerate your business and grow your revenue by offering our world-class Managed Detection and Response (MDR) services.
Learn about our Partner Program
PARTNER RESOURCES
Apply today to partner with the Authority in Managed Detection and Response.
Login to the Partner Portal for resources and content for current partners.
Search
Resources
Security advisories — Feb 27, 2019

Privilege Escalation Flaw in Windows Task Scheduler

On August 27th, an independent security researcher released a vulnerability in Windows Task Scheduler [1]. If exploited the vulnerability would allow a threat actor, with pre-established access to the system, to raise their privilege from user-mode privileges to full system privileges. At the time of writing this attack has not been seen in the wild, but Proof of Concept (PoC) code has been publicly released, increasing the likelihood that threat actors will quickly adapt and employ this attack. Windows 10 and Windows Server 2016 systems are vulnerable to this privilege escalation method. The vulnerability and PoC were publicly released without giving the vendor notice; as such security patches are not yet available.

What we’re doing about it

What you should do about it

Additional information

The major concern relating to this vulnerability is that threat actors may incorporate it into their malware. This would greatly increase the potential damage attacks by giving threat actors a higher privilege level than otherwise possible.

The flaw stems from the Task Scheduler API function, SchRpcSetSecurity, which fails to check permissions. Any account can call it and set file permissions on anything on the system [3].


References:

[1] Microsoft Windows task scheduler contains a local privilege escalation vulnerability in the ALPC interface Vulnerability Note VU#906424
https://www.kb.cert.org/vuls/id/906424

[2] CVE-2018-8440 | Windows ALPC Elevation of Privilege Vulnerability Security Vulnerability
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8440

[3] Double Pulsar: Task Scheduler ALPC exploit high-level analysis – CVE-2018–8440
https://doublepulsar.com/task-scheduler-alpc-exploit-high-level-analysis-ff08cda6ad4f