EPM Policy Scope: Blocking the Wrong Thing
A manufacturing company is rolling out CyberArk Endpoint Privilege Manager to 4,000 Windows endpoints across three sites. The initial goal is to remove local admin rights from standard users. The EPM team creates a single 'Block and Elevate' policy: any process requesting elevation that is not on the allowlist is blocked, and users can request elevation through a justification prompt. The allowlist contains 12 common business apps. Within a week: (1) the plant-floor engineering team can't run their CAD/CAM tooling, which auto-updates weekly and launches helper processes from a temp directory; (2) helpdesk tickets spike 300% because users are clicking 'request' on the same blocked apps repeatedly; (3) a security analyst notices that one blocked binary was actually a legitimate signed installer, but it was blocked because it wasn't on the allowlist. Leadership wants to 'just give engineering local admin back' to stop the bleeding.
1. Diagnose the policy design problems. Why is the allowlist approach failing here?
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The policy is a static allowlist applied to a dynamic environment. Several distinct problems are tangled together:
- Allowlisting by application name is too brittle for auto-updating software. CAD/CAM tools that update weekly and spawn helper processes from temp directories will constantly produce binaries the static list doesn't know. The block is technically 'working' but operationally wrong.
- No distinction between 'unknown' and 'malicious.' The signed installer was blocked purely for being absent from the list - the policy can't tell the difference between 'we haven't approved this' and 'this is dangerous.' That produces false positives that erode trust.
- The justification prompt is doing the wrong job. 300% ticket growth from users re-requesting the same apps means the request flow is a dead end - users have no feedback, no memory of prior decisions, and no path to a fix. A prompt that just says 'no' trains people to click through or escalate.
- One global policy for three sites and wildly different roles. Plant-floor engineering and office users have different software needs; a single allowlist can't serve both.
The root error is treating EPM as a pure blocklist exercise rather than a graduated control that distinguishes trusted, unknown, and malicious software.
2. Leadership proposes restoring local admin to engineering. Evaluate that and propose a better path.
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Restoring local admin to engineering undoes the control for the population most likely to need it and reopens the exact risk EPM was deployed to close - engineering endpoints run CAD tooling, often with plugins and network shares, and are a common malware target. It's the fastest way to make the tickets stop and the slowest way to build a durable program.
A better path uses the graduated controls EPM provides:
- Trust by publisher/signature, not just by binary. Allow the CAD vendor's signed publisher so weekly updates and helper processes are covered without re-listing every build. This directly addresses problem (1).
- Handle the temp-directory helpers deliberately. Many apps legitimately launch helpers from temp; scope an exception for that app's known behavior rather than blanket-allowing temp execution.
- Make the request flow useful. Cache/remember prior approvals so users aren't re-requesting the same app; route repeated requests to the app owner for a policy decision instead of a user-by-user prompt. This addresses (2).
- Separate 'unknown' from 'blocked.' For signed, reputable software not yet on the list, consider an audit/alert mode rather than hard block, so you learn before you break. This addresses (3).
- Differentiate policy by role/site. Engineering gets a policy tuned to its toolchain; office users get a tighter one.
If a temporary exception is truly needed, make it time-bound, scoped to the specific app, and monitored - not a blanket return of local admin.