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Business information leak - Credit Cards

Description​

As a result of a misconfiguration in the creditcarId variable, customer credit card data can be seen through the responses to the requests made. Thus, it was possible to obtain business information, such as:

  • Strategic information.
  • Customer information.

Impact​

-Obtain credit card information of current users. -List valid cards and their expiration dates.

Recommendation​

According to the classification of the information found, establish the necessary controls so that the information is accessible only to the indicated persons.

Threat​

External attacker with access to valid token.

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: L
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:X
  • Score:
    • Base: 4.3
    • Temporal: 4.0
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

Credit card numbers are correctly handled by using secure encrypting algorithms

app.post('/editPaymentMethod', isLoggedIn, function(req, res, next){
  User.update({ _id: req.user.id}, req.body, function(err, user){
    //A credit card gets assigned a random id
    creditCardId = createUuid(user);
    res.message("creditCardid"+creditCardId);
    res.redirect('/profile/payments');
  }
});

Non compliant code​

Credit card numbers are passed as plain text to variable that can be accessed

app.post('/editPaymentMethod', isLoggedIn, function(req, res, next){
  User.update({ _id: req.user.id}, req.body, function(err, user){
    //The credit card number gets passed to a variable without hashing
    creditCardId = req.body.creditCardNumber;
    res.message("creditCardid"+creditCardId);
    res.redirect('/profile/payments');
  }
});

Requirements​

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