TMA-IBMCLOUD-COS-NO-PUBLIC-ACCESS

Ensure Cloud Object Storage buckets are not publicly accessible

CriticalLevel 1Automatedibmcloud

Description

COS public access is granted through policies on the account's Public Access group. That group must have no cloud-object-storage policies (passes if the group does not exist). Read-only ibmcloud CLI calls using the current CLI session and targeted region (ibmcloud login, or IBMCLOUD_API_KEY); JSON output is parsed with grep/sed/awk. A missing CLI, plugin or session fails the check.

How it is checked

Audit method: Shell command

shell

grp=$(ibmcloud iam access-groups --output json 2>/dev/null) || exit 1
if ! printf '%s\n' "$grp" | grep -q '"Public Access"'; then echo compliant; exit 0; fi
out=$(ibmcloud iam access-group-policies "Public Access" --output json 2>/dev/null) || exit 1
n=$(printf '%s\n' "$out" | grep -c '"cloud-object-storage"' || true)
[ "$n" -eq 0 ] && echo compliant

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Remove the cloud-object-storage policies from the Public Access group (ibmcloud iam access-group-policy-delete "Public Access" <policy-id>) and disable public access in the COS console.

Properties

Operating systems: Any
Tags: ibmcloudstorage
Reference: CIS IBM Cloud Foundations Benchmark v2.0.0 - Storage - Cloud Object Storage public access disabled (verify section number for your release)

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target ibmcloud