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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​