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Insecure service configuration - Backdoor

Description​

Due a misconfiguration on services it is possible to upload files and install backdoors for later access, and leave them for public access.

Impact​

  • Leave a shell for public access.
  • Get access to server files.
  • Upload and erase resources.

Recommendation​

Implement the secure configuration of the vulnerable service, allowing it to only be accessed by authorized users and execute continuous monitoring on resources and the server.

Threat​

Unauthorized external attacker with a service that allow the upload of files.

Expected Remediation Time​

⌚ 300 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: N
  • User interaction: N
  • Scope: C
  • Confidentiality: H
  • Integrity: H
  • Availability: L

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L/E:X/RL:X/RC:X
  • Score:
    • Base: 8.9
    • Temporal: 8.9
  • Severity:
    • Base: High
    • Temporal: High

Code Examples​

Compliant code​

All services should be configured to require client certificates

Defaults:
  policyProject: 'SecurityPolicy'
  Policies:
    MQEndpoint: 'MQEndpoint'
    remoteDefaultQueueManager: '{MQClientPolicy}:MQEndpoint'
  ReqAccess:
    requireClientCert: true

Non compliant code​

A service is wrongly configured to not requiring client certificates

Defaults:
  policyProject: 'DefaultPolicies'
  Policies:
    MQEndpoint: 'MQEndpoint'
    remoteDefaultQueueManager: '{MQClientPolicy}:MQEndpoint'
  ReqAccess:
    requireClientCert: false

Requirements​

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