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Privilege escalation

Description​

Due to an insecure role configuration, it is possible to obtain administrative access or privileges using a standard user account.

Impact​

Get access to information and operations that should not be available for the current role.

Recommendation​

The roles must be controlled with users tokens or the exposure of user ID must be avoided.

Threat​

Authenticated attacker from the Internet.

Expected Remediation Time​

⌚ 60 minutes.

Score​

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

Base​

  • Attack vector: N
  • Attack complexity: H
  • Privileges required: H
  • User interaction: N
  • Scope: C
  • Confidentiality: H
  • Integrity: H
  • Availability: H

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:X
  • Score:
    • Base: 8.0
    • Temporal: 8.0
  • Severity:
    • Base: High
    • Temporal: High

Code Examples​

Compliant code​

Every user role should have clearly defined authorization restrictions to resources

{
  "Effect": "Allow",
  "Action": "iam:PassRole",
  "Resource": [
    "arn:aws:::123456789012:role/user"
    "arn:aws:::123456789012:role/admin"
  ]
}

Non compliant code​

The application uses a resource with unrestricted access or not correctly configured restrictions

Resources:
  BucketPolicy1:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: DOC-EXAMPLE-BUCKET
      PolicyDocument:
        Version: 2012-10-17
        Statement:
          - Action:
              - 's3:GetObject'
            Effect: Allow
            Resource:
              - ''
              - - 'arn:aws:s3:::'
                - DOC-EXAMPLE-BUCKET
                - /*
            Principal: '*'
            Condition:
              StringLike:
                'aws:Referer':
                  - 'http://www.example.com/*'
                  - 'http://example.net/*'

An IAM configuration with a PassRole that uses a wild card access

Resources:
  AWS_IAM_Role_1:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Statement:
          - Effect: Allow
            Action: iam:PassRole
            Resource: '*'
            Condition:
              StringEquals:
                iam:PassedToService: myhost.com

Requirements​

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