Skip to main content

Technical information leak - SourceMap

Description​

The .map files are exposed, making it easy for a malicious actor to analyze the application.

Impact​

Understand the inner workings of the application to generate new attack vectors.

Recommendation​

Limit access of map files to authorized users and roles.

Threat​

Unauthorized user from the Internet.

Expected Remediation Time​

⌚ 15 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: X

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:X
  • Score:
    • Base: 5.3
    • Temporal: 5.0
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

The sourceMap files should only be used to debug production code but should not be included in the source code

(function() {
  var greet, greetButton, person;
  person = document.getElementById('person');
  greet = function(greeting) {
    return console.log(greeting + " " + person.value);
  };
  person.addEventListener("focus", function() {
    return person.value = "";
  });
  greetButton = document.getElementById('greet');
  greetButton.addEventListener("click", function() {
    var greeting, helloOption;
    helloOption = document.querySelector("#hello");
    greeting = helloOption.checked ? "Hello" : "Goodbye";
    return greet(greeting);
  });
}).call(this);

Non compliant code​

The source code includes direct access to SourceMap files

(function() {
  var greet, greetButton, person;
  person = document.getElementById('person');
  greet = function(greeting) {
    return console.log(greeting + " " + person.value);
  };
  person.addEventListener("focus", function() {
    return person.value = "";
  });
  greetButton = document.getElementById('greet');
  greetButton.addEventListener("click", function() {
    var greeting, helloOption;
    helloOption = document.querySelector("#hello");
    greeting = helloOption.checked ? "Hello" : "Goodbye";
    return greet(greeting);
  });
}).call(this);

//# sourceMappingURL=http://example.com/path/to/your/sourcemap.map</pre>

Requirements​

free trial

Search for vulnerabilities in your apps for free with our automated security testing! Start your 21-day free trial and discover the benefits of our Continuous Hacking Machine Plan. If you prefer a full service that includes the expertise of our ethical hackers, don't hesitate to contact us for our Continuous Hacking Squad Plan.