cis-ocp-v190-5.2.5

DevOps & Security

Minimize the admission of containers with allowPrivilegeEscalation (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.9.0 - Control 5.2.5

Profile Applicability

Level: 1

Description

Do not generally permit containers to be run with the allowPrivilegeEscalation flag set to true.

Rationale

A container running with the allowPrivilegeEscalation flag set to true may have processes that can gain more privileges than their parent.

There should be at least one Security Context Constraint (SCC) defined which does not permit containers to allow privilege escalation. The option exists (and is defaulted to true) to permit setuid binaries to run.

If you have need to run containers which use setuid binaries or require privilege escalation, this should be defined in a separate SCC and you should carefully check RBAC controls to ensure that only limited service accounts and users are given permission to access that SCC.

Impact

Pods defined with Allow Privilege Escalation: true will not be permitted unless they are run under a specific SCC.

Audit Procedure

Use the following command to list all SCCs with allowPrivilegeEscalation set to false:

oc get scc -A -o json | jq '.items[] | select(.allowPrivilegeEscalation==false) | .metadata.name'

Verify that there is at least one SCC is returned.

Remediation

Create an SCC that sets allowPrivilegeEscalation to false and take it into use by assigning it to applicable users and groups.

Default Value

By default, the following SCCs do not allow privilege escalation:

"hostnetwork-v2"
"nonroot-v2"
"restricted-v2"

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts	x	x	x
v8	12.8 Establish and Maintain Dedicated Computing Resources for All Administrative Work			x
v7	4.3 Ensure the Use of Dedicated Administrative Accounts	x	x	x

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1611	TA0004	M1038, M1048

Profile

Level 1 (Manual)