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Business information leak - Token

Description​

Some of the information of the user like the username/email and full name is included in the data contained in the session token.

Impact​

Obtain name and emails of users.

Recommendation​

Avoid to include sensitive user information in the session token.

Threat​

External attacker with access to tokens.

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: H
  • Privileges required: L
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N/E:X/RL:X/RC:X
  • Score:
    • Base: 3.1
    • Temporal: 3.1
  • Severity:
    • Base: Low
    • Temporal: Low

Code Examples​

Compliant code​

The response token does not include any sensitive user information

app.post("/user/generateToken", (req, res) => {
  // Validate User Code
  let jwtSecretKey = process.env.JWT_SECRET_KEY;
  let data = {
    time: Date(),
    userId: 12,
  }
  const token = jwt.sign(data, jwtSecretKey);
  res.send(token);
});

Non compliant code​

The response token includes sensitive information as plain text

app.post("/user/generateToken", (req, res) => {
  // Validate User Code
  let jwtSecretKey = process.env.JWT_SECRET_KEY;
  let data = {
    //Include confidential information in the response
    userName: req.body.user,
    password: req.body.password,
  }
  const token = jwt.sign(data, jwtSecretKey);
  res.send(token);
});

Requirements​

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