Why Cloud Security Testing Is Essential: Your Side of Shared Responsibility

Almost no cloud breach we're called in on exploited the cloud provider. AWS, Azure, and GCP run some of the most-audited infrastructure on earth. What gets breached is the part the customer owns — a bucket left public, a role scoped too widely, a key committed to a repo, a network flatter than the architecture diagram claims. That's the shared-responsibility line, and nearly all real cloud incidents start on your side of it.

The misconfigurations we find most

Across cloud assessments, the same handful of issues account for a large share of the exploitable findings:

• Publicly reachable storage. A world-readable object store — often holding user uploads, backups, or logs — is the classic one-step data breach. It requires no exploit; it requires someone to look.
• Over-privileged identity. IAM roles and policies granted "just to make it work" become privilege-escalation paths. One foothold plus one over-scoped role frequently equals full account control.
• Long-lived and leaked keys. Access keys that never rotate, or that end up in a code repository or a CI log, are valid credentials an attacker can simply use. There's no vulnerability to patch — the door was left open.
• Flat networks and permissive security groups. Segmentation that exists on the diagram but not in the security groups lets a compromised workload reach far more than it should.
• Missing or misconfigured logging. When CloudTrail, activity logs, or flow logs aren't capturing the right events, an incident is invisible until the damage is done.

Individually, several of these look moderate. Chained, they're a breach: a public bucket that leaks a config file, a key in that config, a role that key can assume, a database that role can read.

Why a scanner isn't enough

Cloud posture scanners are useful for breadth — they'll flag the public bucket and the open port. What they don't do is reason about reachability and chaining. A finding that's technically "misconfigured" but unreachable is noise; a pair of medium findings that combine into full data access is the thing that matters. Testing your cloud means validating what an attacker in your environment could actually reach, not counting configuration deviations.

How to test your side of the line

A credible cloud security assessment works across three layers:

1. Configuration. Storage exposure, encryption posture, network paths, and logging gaps, benchmarked and prioritized by what's actually reachable — not by raw severity.
2. Identity. IAM roles, policies, trust relationships, and key hygiene — because identity is where a foothold turns into control.
3. Workload. Containers, functions, and instances assessed for image vulnerabilities, metadata-service abuse, and runtime exposure.

Then the findings are chained the way an attacker would chain them, so priorities are self-evident: "this bucket plus this role equals your database" is a sentence a team acts on immediately.

The takeaway

The cloud provider secures the cloud. You secure what you put in it — and that's where the incidents happen. If your last cloud review was a scanner run that produced a thousand unranked findings, you have a list, not an assessment. Testing your side of the shared-responsibility line, with findings validated as reachable and chained into real attack paths, is what turns that list into decisions.

If you'd like your cloud posture assessed this way, our cloud security testing engagements cover AWS, Azure, GCP, and Oracle Cloud — configuration, identity, and workload — with every finding ranked by what an attacker could actually reach.