/
gcp_computeinstances_create_privilege_escalation.yml
381 lines (381 loc) · 15.3 KB
/
gcp_computeinstances_create_privilege_escalation.yml
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AnalysisType: rule
LogTypes:
- GCP.AuditLog
Description: Detects compute.instances.create method for privilege escalation in GCP.
DisplayName: "GCP compute.instances.create Privilege Escalation"
RuleID: "GCP.compute.instances.create.Privilege.Escalation"
Enabled: true
Reference: https://rhinosecuritylabs.com/gcp/privilege-escalation-google-cloud-platform-part-1/
Runbook: Confirm this was authorized and necessary behavior.
Reports:
MITRE ATT&CK:
- TA0004:T1548 # Abuse Elevation Control Mechanism
Severity: High
Filename: gcp_computeinstances_create_privilege_escalation.py
DedupPeriodMinutes: 60
Threshold: 1
Tests:
- Name: GCP compute.instances - Potential Privilege Escalation
ExpectedResult: true
Log:
{
"protoPayload":
{
"at_sign_type": "type.googleapis.com/google.cloud.audit.AuditLog",
"authenticationInfo":
{
"principalEmail": "some.user@company.com",
"principalSubject": "user:some.user@company.com",
},
"authorizationInfo":
[
{
"granted": true,
"permission": "compute.instances.create",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
{
"granted": true,
"permission": "compute.disks.create",
"resource": "projects/some-project/zones/us-central1-f/disks/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/disks/abc",
"service": "compute",
"type": "compute.disks",
},
},
{
"granted": true,
"permission": "compute.subnetworks.use",
"resource": "projects/some-project/regions/us-central1/subnetworks/default",
"resourceAttributes":
{
"name": "projects/some-project/regions/us-central1/subnetworks/default",
"service": "compute",
"type": "compute.subnetworks",
},
},
{
"granted": true,
"permission": "compute.subnetworks.useExternalIp",
"resource": "projects/some-project/regions/us-central1/subnetworks/default",
"resourceAttributes":
{
"name": "projects/some-project/regions/us-central1/subnetworks/default",
"service": "compute",
"type": "compute.subnetworks",
},
},
{
"granted": true,
"permission": "compute.instances.setMetadata",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
{
"granted": true,
"permission": "compute.instances.setServiceAccount",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
],
"methodName": "v1.compute.instances.insert",
"request":
{
"@type": "type.googleapis.com/compute.instances.insert",
"disks": ...,
"machineType": ...,
"name": ...,
"networkInterfaces": ...,
"serviceAccounts":
[
{
"email": "abcmail@some-project.iam.gserviceaccount.com",
"scopes":
[
"https://www.googleapis.com/auth/cloud-platform",
"https://www.googleapis.com/auth/iam",
],
},
],
},
"requestMetadata":
{
"callerIP": "1.2.3.4",
"callerSuppliedUserAgent": "(gzip),gzip(gfe)",
"destinationAttributes": {},
"requestAttributes":
{ "auth": {}, "time": "2024-01-30T12:52:36.003867Z" },
},
"resourceLocation": ...,
"resourceName": "projects/some-project/zones/us-central1-f/instances/abc",
"response":
{
"@type": "type.googleapis.com/operation",
"id": "8758546889396539388",
"insertTime": "2024-01-30T04:52:35.886-08:00",
"name": "operation-1706619154623-610293c7a6a25-934f1c35-1efebb12",
"operationType": "insert",
"progress": "0",
"selfLink": "https://www.googleapis.com/compute/v1/projects/some-project/zones/us-central1-f/operations/operation-1706619154623-610293c7a6a25-934f1c35-1efebb12",
"selfLinkWithId": "https://www.googleapis.com/compute/v1/projects/some-project/zones/us-central1-f/operations/8758546889396539388",
"startTime": "2024-01-30T04:52:35.887-08:00",
"status": "RUNNING",
"targetId": "1454427709413609468",
"targetLink": "https://www.googleapis.com/compute/v1/projects/some-project/zones/us-central1-f/instances/abc",
"user": "some.user@company.com",
"zone": "https://www.googleapis.com/compute/v1/projects/some-project/zones/us-central1-f",
},
"serviceName": "compute.googleapis.com",
},
"receiveTimestamp": "2024-01-30 12:52:36.642422049",
"resource":
{
"labels":
{
"instance_id": "1454427709413609468",
"project_id": "some-project",
"zone": "us-central1-f",
},
"type": "gce_instance",
},
"severity": "NOTICE",
"timestamp": "2024-01-30 12:52:34.676384000",
}
- Name: GCP compute.instances - Error
ExpectedResult: false
Log:
{
"protoPayload":
{
"at_sign_type": "type.googleapis.com/google.cloud.audit.AuditLog",
"authenticationInfo":
{
"principalEmail": "some.user@company.com",
"principalSubject": "user:some.user@company.com",
},
"authorizationInfo":
[
{
"granted": true,
"permission": "compute.instances.create",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
{
"granted": true,
"permission": "compute.disks.create",
"resource": "projects/some-project/zones/us-central1-f/disks/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/disks/abc",
"service": "compute",
"type": "compute.disks",
},
},
{
"granted": true,
"permission": "compute.subnetworks.use",
"resource": "projects/some-project/regions/us-central1/subnetworks/default",
"resourceAttributes":
{
"name": "projects/some-project/regions/us-central1/subnetworks/default",
"service": "compute",
"type": "compute.subnetworks",
},
},
{
"granted": true,
"permission": "compute.subnetworks.useExternalIp",
"resource": "projects/some-project/regions/us-central1/subnetworks/default",
"resourceAttributes":
{
"name": "projects/some-project/regions/us-central1/subnetworks/default",
"service": "compute",
"type": "compute.subnetworks",
},
},
{
"granted": true,
"permission": "compute.instances.setMetadata",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
{
"granted": true,
"permission": "compute.instances.setServiceAccount",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
],
"methodName": "v1.compute.instances.insert",
"request":
{
"@type": ...,
"disks": ...,
"machineType": ...,
"name": ...,
"networkInterfaces": ...,
"serviceAccounts":
[
{
"email": "abcmail@some-project.iam.gserviceaccount.com",
"scopes":
[
"https://www.googleapis.com/auth/cloud-platform",
"https://www.googleapis.com/auth/iam",
],
},
],
},
"requestMetadata": ...,
"resourceLocation": ...,
"resourceName": "projects/some-project/zones/us-central1-f/instances/abc",
"response":
{
"@type": "type.googleapis.com/error",
"error":
{
"code": 404,
"errors":
[
{
"domain": "global",
"message": "The resource 'abc' was not found",
"reason": "notFound",
},
],
"message": "The resource 'abc' was not found",
},
},
"serviceName": "compute.googleapis.com",
"status":
{ "code": 5, "message": "The resource 'abc' was not found" },
},
"receiveTimestamp": "2024-01-30 11:03:56.719662927",
"resource":
{
"labels":
{
"instance_id": "",
"project_id": "some-project",
"zone": "us-central1-f",
},
"type": "gce_instance",
},
"severity": "ERROR",
"timestamp": "2024-01-30 11:03:55.700872000",
}
- Name: GCP compute.instances - Not All Permissions
ExpectedResult: false
Log:
{
"protoPayload":
{
"at_sign_type": "type.googleapis.com/google.cloud.audit.AuditLog",
"authenticationInfo":
{
"principalEmail": "some.user@company.com",
"principalSubject": "user:some.user@company.com",
},
"authorizationInfo":
[
{
"granted": true,
"permission": "compute.instances.create",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
{
"granted": true,
"permission": "compute.disks.create",
"resource": "projects/some-project/zones/us-central1-f/disks/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/disks/abc",
"service": "compute",
"type": "compute.disks",
},
},
{
"granted": true,
"permission": "compute.subnetworks.use",
"resource": "projects/some-project/regions/us-central1/subnetworks/default",
"resourceAttributes":
{
"name": "projects/some-project/regions/us-central1/subnetworks/default",
"service": "compute",
"type": "compute.subnetworks",
},
},
{
"granted": true,
"permission": "compute.subnetworks.useExternalIp",
"resource": "projects/some-project/regions/us-central1/subnetworks/default",
"resourceAttributes":
{
"name": "projects/some-project/regions/us-central1/subnetworks/default",
"service": "compute",
"type": "compute.subnetworks",
},
},
{
"granted": true,
"permission": "compute.instances.setMetadata",
"resource": "projects/some-project/zones/us-central1-f/instances/abc",
"resourceAttributes":
{
"name": "projects/some-project/zones/us-central1-f/instances/abc",
"service": "compute",
"type": "compute.instances",
},
},
],
"methodName": "v1.compute.instances.insert",
"request": ...,
"requestMetadata": ...,
"resourceLocation": ...,
"resourceName": ...,
"response": ...,
"serviceName": ...,
},
"receiveTimestamp": ...,
"resource": ...,
}