Application Allow-listing: What it is, why it matters, and how to deploy it safely

Application Allow-listing

What it is

Application allow-listing (aka “only these apps may run”) is a safety rule for your devices. You create a small, approved list of programs—and everything else is blocked by default. If it’s not on the list, it doesn’t launch.

Why it matters

  • Stops malware cold: unknown files can’t execute.

  • Shrinks attack surface: fewer ways in, fewer surprises.

  • Raises trust: every running app is known and vetted.

How it works (30-second version)

  • You approve apps by path, publisher signature, or file hash.

  • The system checks each launch against the policy.

  • Updates are handled with rules (e.g., allow signed updates from the vendor).

Where it shines

  • Servers, admin workstations, POS/kiosks, shared school or library PCs.

  • Teams handling sensitive data or high-risk roles.

Gotchas (plan for these)

  • Updates break if rules are too strict—build an update path.

  • Power users/dev tools may need exceptions or a “developer mode.”

  • Shadow IT gets surfaced—have a fast request/approval workflow.

Rollout quick plan

  1. Audit what actually runs (baseline your fleet).

  2. Draft rules: prefer vendor signature + known paths; hash for high-risk tools.

  3. Pilot in monitor mode to see blocks without enforcing.

  4. Enforce gradually; review requests and tune.

    Glossary (A–Z)

    All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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