Most engineers think…
Most people assume CASB and DLP mean buying two more products and stitching them into the traffic path. With Cato, that mental model is wrong — and it shows in an interview.
Because every site and remote user already flows through the Cato SASE Cloud single-pass engine, CASB and DLP run as features inside that one engine and one policy. CASB discovers sanctioned and unsanctioned apps, scores their risk and applies granular activity and tenant controls; DLP inspects the same traffic for sensitive content and blocks or alerts. There is no separate appliance to chain — the value is that being in-path lets both work together, everywhere, from one rule set.
① The problem — SaaS sprawl, Shadow IT and data leaking out
Two everyday risks keep security teams up at night. First, SaaS sprawl and Shadow IT: people sign up for cloud apps on their own, so the org has no list of what is in use, which apps are risky, or what data is going into them. Second, sensitive data leaking out — a customer spreadsheet uploaded to a personal cloud drive, payment-card data pasted into a random web app.
The traditional fix was bolting on a separate CASB and a separate DLP product, each with its own console and its own place in the path. Cato's advantage is that everything already flows through it. Because every edge routes through the Cato SASE Cloud, the chance to govern SaaS and inspect content is built in — no extra box required.
Why can Cato offer CASB and DLP without a separate appliance?
② CASB — discover apps, score risk, control activity and tenants
Since all traffic passes through Cato, CASB can see the cloud apps people actually use and split them into sanctioned (corporate-approved) and unsanctioned / Shadow IT (personal or unapproved). To make decisions by risk rather than by name, Cato maintains a cloud app catalog of thousands of apps, each with a risk score based on security and compliance attributes.
Controls that aren't all-or-nothing
Per app you can allow, block or restrict, and go further with activity-level controls — for example, allow viewing or downloading from an unsanctioned app but block upload, or allow chat but block file sharing. CASB also enforces tenant restrictions: allow the corporate Microsoft 365 tenant while blocking personal tenants of the same app, so nobody signs into a personal instance to move data out.
Discovers cloud/SaaS apps inline, splits sanctioned vs unsanctioned (Shadow IT), scores app risk, and applies activity and tenant controls.
Inspects content for built-in data types (PII, PCI, PHI, financial, secrets) plus custom patterns, and blocks or alerts on uploads/downloads.
Unsanctioned, unapproved apps employees adopt on their own — surfaced by CASB because all traffic passes through Cato.
A CASB control that allows your corporate tenant of an app while blocking personal tenants of the same app.
In an interview, don't say 'block the app'. Say you discover apps, score risk from the catalog, then apply granular activity controls (allow view, block upload) and tenant restrictions (corporate tenant yes, personal no). That is the difference between governance and a blunt firewall.
You want to let staff read files from an unsanctioned cloud drive but stop them uploading company data. Which CASB capability fits?
③ DLP — inspect content for sensitive data, then block or alert
DLP inspects the actual content moving over the web and SaaS apps for sensitive data. It ships with built-in data types — PII, PCI / payment-card, PHI / health, financial and secrets/credentials — plus custom patterns and dictionaries (keywords and regex) you define for your own data.
On a match, DLP controls the action — block or alert (monitor) — on both uploads and downloads, across the web and SaaS apps. Crucially, DLP is part of the same single-pass engine and the same unified policy as the rest of Cato; there is no separate DLP appliance to deploy or chain. You write a data-protection rule in the one place every other rule lives.
Cato DLP uses built-in data types (PII, PCI, PHI, financial, secrets) and custom patterns/dictionaries, with block or alert on uploads and downloads across web and SaaS — all in one policy. Reducing it to 'a keyword filter' misses that it converges with CASB and runs in the same single-pass engine.
▶ Watch a PII upload to a personal cloud drive get blocked
How one upload is inspected end-to-end by CASB and DLP together. Press Play for the healthy path, then Break it to see the classic failure.
Which is a built-in Cato DLP data type?
④ Converged in one policy — every edge, TLS, and tuning
The real power is that CASB and DLP are converged. One rule can decide an action from both signals at once: block uploading any file containing credit-card numbers to an unsanctioned cloud drive. CASB identifies the app, tenant and activity; DLP inspects the content; the combined verdict acts. And because it is part of SASE, the same policy applies to all edges — every site and every remote user — with no per-location config.
The dependency and the pitfalls
All of this rests on TLS inspection: SaaS and web traffic is HTTPS, so Cato must decrypt it to see activity and file content. No TLS inspection = no visibility, and both CASB activity controls and DLP go blind. The other classic mistakes: using all-or-nothing app blocking instead of activity controls, and turning on broad DLP data types without tuning, which buries real incidents under false positives. Start in alert/monitor, tune, then promote to block.
Sneha at a Hyderabad fintech faces this
Despite a Cato DLP rule meant to stop customer PII leaving, a finance analyst uploads a customer spreadsheet to a personal cloud drive and nothing is blocked or logged.
TLS inspection is not enabled for that user group, so Cato sees only encrypted traffic and can't read the SaaS activity or the file content — CASB and DLP are effectively blind.
In the Cato Management Application the CASB & DLP rule shows zero hits for that app, and the user group is excluded from TLS inspection.
Cato Management Application ▸ Security ▸ TLS Inspection + CASB & DLP rulesEnable TLS inspection for the group (with a sensible bypass list for cert-pinned apps), set the CASB rule to block personal tenants of the cloud-drive app, and set the DLP rule on the PII data type to block on upload; start in alert to baseline, then promote to block.
Re-test the upload: CASB flags the unsanctioned personal-tenant app, DLP detects PII in the file, the upload is blocked and logged, while legitimate sanctioned-app traffic still flows.
Never assume a DLP rule works. Confirm TLS inspection is enabled for the group, then run a controlled upload of a benign test file containing the data type. Watch the rule hit and the event log. If there is no hit, TLS inspection or the data-type scope is the first suspect.
A Cato DLP rule isn't firing on SaaS uploads at all. What should you check first?
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🧠 In your own words
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📖 Glossary
- CASB (Cloud Access Security Broker)
- Gives visibility and control over cloud/SaaS app usage — sanctioned vs unsanctioned, with risk scoring and granular controls.
- DLP (Data Loss Prevention)
- Inspects content for sensitive data types and blocks or alerts on uploads/downloads to stop data leaving.
- Single-pass engine
- Cato inspects each packet once and applies all security functions, including CASB and DLP, in that one pass.
- Sanctioned app
- A corporate-approved cloud application that the org has chosen to allow.
- Unsanctioned app / Shadow IT
- A personal or unapproved cloud app users adopt on their own, surfaced by CASB because traffic passes through Cato.
- App risk score
- A rating in Cato's cloud app catalog reflecting an app's security and compliance posture, so you decide by risk.
- Activity control
- A granular CASB control over actions inside an app — e.g. allow viewing/downloading but block upload or file sharing.
- Tenant restriction
- A CASB control that allows the corporate tenant of an app while blocking personal tenants of the same app.
- Data type
- A DLP classifier for sensitive content — built-in (PII, PCI, PHI, financial, secrets) or a custom pattern/dictionary.
- TLS inspection
- Decrypting HTTPS so Cato can read SaaS activity and file content; without it CASB and DLP are blind.
📚 Sources
- Cato Networks — CASB (Cloud Access Security Broker) product page. catonetworks.com
- Cato Networks — Data Loss Prevention (DLP) product page. catonetworks.com
- Cato Knowledge Base — Configuring the CASB / Application Control policy. support.catonetworks.com
- Cato Knowledge Base — Configuring DLP data types, content profiles and rules. support.catonetworks.com
- Cato Knowledge Base — TLS Inspection configuration and bypass list. support.catonetworks.com
- Cato Networks — The Cato SASE Cloud single-pass architecture (SSE 360). catonetworks.com
What's next?
Got CASB and DLP? Next, see the Cato Management Application and the unified policy model — the single console and the one-policy approach that ties CASB, DLP and the rest of Cato's security together.