References to Advisories, Solutions, and Tools

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Change History

A vulnerability identified in the Trellix HX Agent driver file  fekern.sys allowed a threat actor with local user access the ability to gain elevated system privileges.  Utilization of a Bring Your Own Vulnerable Driver (BYOVD) was leveraged to gain access to the critical Windows process memory lsass.exe (Local Security Authority Subsystem Service).  The fekern.sys; a driver file associated with Trellix HX Agent (used in all existing HX Agent versions).    The vulnerable driver installed in a product or a system running fully functional HX Agent is, itself, not exploitable as the product’s tamper protection restricts the ability to communicate with the driver to only the agent’s processes.

AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-20

https://thrive.trellix.com/s/article/000015100