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Automatic information enumeration - Credit Cards

Description​

It is possible to automatically list credit card information, as the expiration date and security code are not validated.

Impact​

List credit cards in payments.

Recommendation​

Filter the information received for payments.

Threat​

Attacker with access to the aplication from the Internet.

Expected Remediation Time​

⌚ 120 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: H
  • Integrity: N
  • Availability: N

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X
  • Score:
    • Base: 7.5
    • Temporal: 7.5
  • Severity:
    • Base: High
    • Temporal: High

Code Examples​

Compliant code​

The application verifies the credit card is valid using all the information (Number, expiry date and security code)

const accessCreditCards = (req, res) => {
  if (isValidNumber(req.body.creditCardInfo)) {
    //Sending credit card information based on CC info and user Id
    const creditCards = listCards(req.body.creditCardinfo, req.body.userId);
    res.end(creditCards);
  }
}

Non compliant code​

The application only checks the CC number before accesing a list of them

const accessCreditCards = (req, res) => {
  if (isValidNumber(req.body.creditCard)) {
    //Sending credit card information based only on CC number
    const creditCards = listCards(req.body.creditCard);
    res.end(creditCards);
  }
}

Requirements​

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