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gcp_iam_service_accounts_get_access_token_privilege_escalation.yml
124 lines (124 loc) · 5.01 KB
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gcp_iam_service_accounts_get_access_token_privilege_escalation.yml
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AnalysisType: rule
Filename: gcp_iam_service_accounts_get_access_token_privilege_escalation.py
RuleID: "GCP.IAM.serviceAccounts.getAccessToken.Privilege.Escalation"
DisplayName: "GCP IAM serviceAccounts getAccessToken Privilege Escalation"
Enabled: true
LogTypes:
- GCP.AuditLog
Reports:
MITRE ATT&CK:
- TA0004:T1548
Severity: High
Description:
The Identity and Access Management (IAM) service manages authorization and authentication for a GCP environment.
This means that there are very likely multiple privilege escalation methods that use the IAM service and/or its permissions.
Reference: https://rhinosecuritylabs.com/gcp/privilege-escalation-google-cloud-platform-part-1/
Tests:
- Name: iam.serviceAccounts.getAccessToken granted
ExpectedResult: true
Log:
{
"protoPayload":
{
"@type": "type.googleapis.com/google.cloud.audit.AuditLog",
"status": {},
"authenticationInfo":
{
"principalEmail": "some-project@company.iam.gserviceaccount.com",
"serviceAccountKeyName": "//iam.googleapis.com/projects/some-project/serviceAccounts/some-project@company.iam.gserviceaccount.com/keys/a378358365ff3d22e9c1a72fecf4605ddff76b47",
"principalSubject": "serviceAccount:some-project@company.iam.gserviceaccount.com",
},
"requestMetadata":
{
"callerIp": "1.2.3.4",
"requestAttributes":
{ "time": "2024-02-26T17:15:16.327542536Z", "auth": {} },
"destinationAttributes": {},
},
"serviceName": "iamcredentials.googleapis.com",
"methodName": "SignJwt",
"authorizationInfo":
[
{
"permission": "iam.serviceAccounts.getAccessToken",
"granted": true,
"resourceAttributes": {},
},
],
"resourceName": "projects/-/serviceAccounts/114885146936855121342",
"request":
{
"name": "projects/-/serviceAccounts/some-project@company.iam.gserviceaccount.com",
"@type": "type.googleapis.com/google.iam.credentials.v1.SignJwtRequest",
},
},
"insertId": "1hu88qbef4d2o",
"resource":
{
"type": "service_account",
"labels":
{
"project_id": "some-project",
"unique_id": "114885146936855121342",
"email_id": "some-project@company.iam.gserviceaccount.com",
},
},
"timestamp": "2024-02-26T17:15:16.314854637Z",
"severity": "INFO",
"logName": "projects/some-project/logs/cloudaudit.googleapis.com%2Fdata_access",
"receiveTimestamp": "2024-02-26T17:15:17.100020459Z",
}
- Name: iam.serviceAccounts.getAccessToken not granted
ExpectedResult: false
Log:
{
"protoPayload":
{
"@type": "type.googleapis.com/google.cloud.audit.AuditLog",
"status": {},
"authenticationInfo":
{
"principalEmail": "some-project@company.iam.gserviceaccount.com",
"serviceAccountKeyName": "//iam.googleapis.com/projects/some-project/serviceAccounts/some-project@company.iam.gserviceaccount.com/keys/a378358365ff3d22e9c1a72fecf4605ddff76b47",
"principalSubject": "serviceAccount:some-project@company.iam.gserviceaccount.com",
},
"requestMetadata":
{
"callerIp": "1.2.3.4",
"requestAttributes":
{ "time": "2024-02-26T17:15:16.327542536Z", "auth": {} },
"destinationAttributes": {},
},
"serviceName": "iamcredentials.googleapis.com",
"methodName": "SignJwt",
"authorizationInfo":
[
{
"permission": "iam.serviceAccounts.getAccessToken",
"granted": false,
"resourceAttributes": {},
},
],
"resourceName": "projects/-/serviceAccounts/114885146936855121342",
"request":
{
"name": "projects/-/serviceAccounts/some-project@company.iam.gserviceaccount.com",
"@type": "type.googleapis.com/google.iam.credentials.v1.SignJwtRequest",
},
},
"insertId": "1hu88qbef4d2o",
"resource":
{
"type": "service_account",
"labels":
{
"project_id": "some-project",
"unique_id": "114885146936855121342",
"email_id": "some-project@company.iam.gserviceaccount.com",
},
},
"timestamp": "2024-02-26T17:15:16.314854637Z",
"severity": "INFO",
"logName": "projects/some-project/logs/cloudaudit.googleapis.com%2Fdata_access",
"receiveTimestamp": "2024-02-26T17:15:17.100020459Z",
}