Summary
The GoCardless components in Actualbudget in are logging responses to STDOUT in a parsed format using console.logand console.debug (Which in this version of node is an alias for console.log). This is exposing sensitive information in log files including, but not limited to:
- Gocardless bearer tokens.
- Account IBAN and Bank Account numbers.
- PII of the account holder.
- Transaction details (Payee bank information, Recipient account numbers, Transaction IDs)...
Details
Whenever GoCardless responds to a request, the payload is printed to the debug log:
https://github.com/actualbudget/actual/blob/36c40d90d2fe09eb1f25a6e2f77f6dd40638b267/packages/sync-server/src/app-gocardless/banks/integration-bank.js#L25-L27
This in turn logs the following information to Docker (all values removed here. These fields are possibly dependent on what is returned by each institution so may differ):
{
"account": {
"resourceId": "",
"iban": "",
"bban": "",
"currency": "",
"name": "<full legal name in the bank>",
"product": "",
"status": "",
"bic": "",
"usage": "",
"id": "",
"created": "",
"last_accessed": "",
"institution_id": "",
"owner_name": "",
"institution": {
"id": "",
"name": "",
"bic": "",
"transaction_total_days": "",
"countries": [
""
],
"logo": "",
"max_access_valid_for_days": "",
"supported_features": [
"",
"",
""
],
"identification_codes": []
}
}
}
https://github.com/actualbudget/actual/blob/36c40d90d2fe09eb1f25a6e2f77f6dd40638b267/packages/sync-server/src/app-gocardless/banks/integration-bank.js#L83-L85
This is the first of the 10 transactions:
{
"top10Transactions": [{
"transactionId": "",
"entryReference": "",
"bookingDate": "",
"valueDate": "",
"transactionAmount": {
"amount": "",
"currency": ""
},
"creditorName": "",
"creditorAccount": {
"bban": ""
},
"debtorName": "",
"debtorAccount": {
"bban": ""
},
"remittanceInformationUnstructured": "",
"remittanceInformationStructuredArray": [
{"reference": "", "referenceType": ""}
],
"additionalInformation": "",
"proprietaryBankTransactionCode": "",
"debtorAgent": "",
"internalTransactionId": "",
"payeeName": "",
"date": ""
}]
}
Additionally, in the error handling for GoCardless, there is a catch all for unclassified errors that prints the entire stack trace to the console.
https://github.com/actualbudget/actual/blob/36c40d90d2fe09eb1f25a6e2f77f6dd40638b267/packages/sync-server/src/app-gocardless/app-gocardless.js#L263-L264
Our bank was offline today for maintenance which threw a 503 error from Gocardless. The entire response payload was dumped to console, which includes the Bearer tokens for accessing GoCardless:
Something went wrong ServiceError: Institution service unavailable
at handleGoCardlessError (file:///app/src/app-gocardless/services/gocardless-service.js:59:13)
at Object.getTransactions (file:///app/src/app-gocardless/services/gocardless-service.js:530:7)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async Object.getNormalizedTransactions (file:///app/src/app-gocardless/services/gocardless-service.js:267:26)
at async file:///app/src/app-gocardless/app-gocardless.js:186:13 {
details: h [AxiosError]: Request failed with status code 503
at te (file:///app/node_modules/nordigen-node/dist/index.esm.js:13:914)
at IncomingMessage.<anonymous> (file:///app/node_modules/nordigen-node/dist/index.esm.js:17:16315)
at IncomingMessage.emit (node:events:529:35)
at endReadableNT (node:internal/streams/readable:1400:12)
at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
code: 'ERR_BAD_RESPONSE',
config: {
transitional: {
silentJSONParsing: true,
forcedJSONParsing: true,
clarifyTimeoutError: false
},
adapter: [ 'xhr', 'http' ],
transformRequest: [ [Function (anonymous)] ],
transformResponse: [ [Function (anonymous)] ],
timeout: 0,
xsrfCookieName: 'XSRF-TOKEN',
xsrfHeaderName: 'X-XSRF-TOKEN',
maxContentLength: -1,
maxBodyLength: -1,
env: {
FormData: [Function: _] {
LINE_BREAK: '\r\n',
DEFAULT_CONTENT_TYPE: 'application/octet-stream'
},
Blob: [class Blob]
},
validateStatus: [Function: validateStatus],
headers: T [AxiosHeaders] {
Accept: 'application/json',
'Content-Type': 'application/json',
'User-Agent': 'Nordigen-Node-v2',
'Authorization': 'Bearer eyJ0eXAi... (the full token is in the response)',
'Accept-Encoding': 'gzip, compress, deflate, br'
},
method: 'get',
url: URL {
href: 'https://bankaccountdata.gocardless.com/api/v2/accounts/<Account id Was Here>?date_from=2024-12-22',
origin: 'https://bankaccountdata.gocardless.com',
protocol: 'https:',
username: '',
password: '',
host: 'bankaccountdata.gocardless.com',
hostname: 'bankaccountdata.gocardless.com',
port: '',
pathname: '/api/v2/accounts/<Account id Was Here>/transactions',
search: '?date_from=2024-12-22',
searchParams: URLSearchParams { 'date_from' => '2024-12-22' },
hash: ''
},
data: undefined
},
And quite a few pages more.
PoC
- Setup an Actualbudget server inside of Docker. In this instance I was using the Docker Compose script posted in the repository: https://github.com/actualbudget/actual/blob/master/packages/sync-server/docker-compose.yml
- Link a gocardless account to Actualbudget and sync a bank account
- Observe in the container using
docker logs actual-actual_server-1 -f that sensitive details are logged to the console and ingested by docker.
Impact
Information disclosure. The services are available both on-premises and in environments that are not under the control of the end user, such as third-party providers who offer this application as a managed solution.
Miggo AI