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Local file inclusion

Description

The application allows to read or execute files located on the server through relative paths manipulation in the input fields.

Impact

  • Visualize the content of sensitive files stored on the server.
  • Get sensitive data.
  • Read system files.

Recommendation

  • Validate that the parameters received by the application do not contain relative paths.
  • Disable insecure functions that allow reading of arbitrary files on the server.

Threat

Unauthorized attacker from local network.

Expected Remediation Time

⌚ 120 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: C
  • Confidentiality: H
  • Integrity: N
  • Availability: N

Temporal

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

Result

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:X/RL:X/RC:X
  • Score:
    • Base: 8.6
    • Temporal: 8.6
  • Severity:
    • Base: High
    • Temporal: High

Code Examples

Compliant code

All input parameters are validated to ensure they do not contain relative routes

private String getFile(userReq){
  try {
      //Function to validate that parameter does not contain relative routes
      isValidReq = validateReq(userReq)
      //Read files from a remote direction not local
      if (isValidReq){
        File file = new File(classLoader.getResource("secureurl").getFile());
        //Code to do something with that file
      }
  }catch{
    ...
  }
}

Non compliant code

The application includes a reference to a local path that could be altered by the user

private String getLocalFile( userReq){
  try {
      Path = "/localPath/" + userReq
      File file = new File(classLoader.getResource(Path).getFile());
      //Code to do something with that file
  }catch{
    ...
  }
}

Requirements