Skip to main content

Authentication mechanism absence or evasion - Security Image

Description​

It is possible to eliminate the use of the image and security phrase at user login.

Impact​

Remove image and security phrase which can facilitate other types of attacks.

Recommendation​

Make sure that only one number of an existing image can be sent so that the image and passphrase function is not eliminated.

Threat​

User authenticated from the Internet.

Expected Remediation Time​

⌚ 240 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: N
  • Integrity: L
  • Availability: N

Temporal​

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

Result​

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

Code Examples​

Compliant code​

The application correctly validates credentials and handles wrong credentials by redirecting user to login

app.Register('/userRegister', function(req, res, next){
  const img = req.user.secImg;
  const phrase = req.user.secPhrase;
  const isCredentialsValid = checkCredentials(img, phrase);
  if isCredentialsValid{
    res.redirect('/profile/SecurityCredentials');
  }else{
    //Code to redirect and retry to validate security credentials
    res.redirect('/userLogin');
  }
});

Non compliant code​

There is a functionality to bypass the verification of the user credentials and accees sensitive information

app.Register('/userRegister', function(req, res, next){
  const img = req.user.secImg;
  const phrase = req.user.secPhrase;
  const isCredentialsValid = checkCredentials(img, phrase);
  if isCredentialsValid{
    res.redirect('/profile/SecurityCredentials');
  }else{
    //If there is a mistake in the credentials sent, the user can still bypass the controls
    res.redirect('/profile/signIn');
  }
});

Requirements​