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Business information leak - Firestore

Description

When attempting to activate a plan, it is evident that the responses to firestore API requests contain user credentials.

Impact

Obtain credentials from other services.

Recommendation

Ensure that responses to requests do not contain confidential information.

Threat

Anonymous attacker from the Internet.

Expected Remediation Time

⌚ 60 minutes.

Score

Default score using CVSS 3.1. It may change depending on the context of the vulnerability.

Base

  • Attack vector: N
  • Attack complexity: L
  • Privileges required: N
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal

  • Exploit code madurity: P
  • Remediation level: X
  • Report confidence: R

Result

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R
  • Score:
    • Base: 5.3
    • Temporal: 4.8
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples

Compliant code

The responses of the application do not include user sensitive data

let db = firebase.database();

app.get("/user/request", (req, res) => {
const userCredentials = req.body.user.token;
const ref = db.ref(req.body.reqDb);
//Code to retrieve information and send it back, without displaying user credentials
});

Non compliant code

The application attaches user credentials to the response of a db query

let db = firebase.database();
app.get("/user/request", (req, res) => {
const userCredentials = req.body.user.token;
const ref = db.ref(req.body.reqDb);
res.send(userCredentials);
res.send(ref);
});

Requirements