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Authentication mechanism absence or evasion - BIOS

Description​

The system lacks an authentication mechanism or has one that can be bypassed. Therefore, an attacker can access system resources by logging into the BIOS.

Impact​

  • Access disk information through other systems.
  • Modify and disabling machine configurations.
  • Delete all machine information by formatting the disk.

Recommendation​

Put in place for every resource with business-critical functionality a strong authentication process and ensure that every user attempting to access it is logged in.

Threat​

Unauthorized internal attacker.

Expected Remediation Time​

⌚ 120 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the src.

Base​

  • Attack vector: P
  • Attack complexity: L
  • Privileges required: N
  • User interaction: N
  • Scope: U
  • Confidentiality: H
  • Integrity: H
  • Availability: H

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
  • Score:
    • Base: 6.8
    • Temporal: 6.8
  • Severity:
    • Base: Medium
    • Temporal: Medium

Score 4.0​

Default score using CVSS 4.0 . It may change depending on the context of the src.

Base 4.0​

  • Attack vector: P
  • Attack complexity: L
  • Attack Requirements: N
  • Privileges required: N
  • User interaction: N
  • Confidentiality (VC): H
  • Integrity (VI): H
  • Availability (VA): H
  • Confidentiality (SC): N
  • Integrity (SI): N
  • Availability (SA): N

Threat 4.0​

  • Exploit maturity: X

Result 4.0​

  • Vector string: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X
  • Score:
    • CVSS-BT: 7.0
  • Severity:
    • CVSS-BT: High

Compliant code​

The application restricts access to sensitive resources only to authorized users

app.post('/accessAdmin', hashedSentCode, function(req, res, next){
  User.register({ _id: req.user.id}, req.body, function(err, user){
    //Validating user has privileges and is correctly logged in
    if (req.body.isLoggedIn && user.isSuperAdmin){
      run userMFA();
      user.allowBIOSAccess = True;
    }
    res.redirect('/profile/BIOSManager');
  }
});

Non compliant code​

The application allows access to BIOS without verifying permissions and secure authentication

app.post('/accessAdmin', function(req, res, next){
  User.register({ _id: req.user.id}, req.body, function(err, user){
    user.allowBIOSAccess = True;
    res.redirect('/profile/BIOSManager');
  }
});

Requirements​

Fixes​

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Last updated on