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Remote File Inclusion

Description​

The application allows to load and execute malicious files from remote locations. This practice may allow an attacker to retrieve sensitive data from the server or execute commands remotely.

Impact​

  • Obtain sensitive data from the server.
  • Execute commands remotely.

Recommendation​

Avoid the usage of dangerous functions such as include, exec, eval, file, readfile among others using non-sanitized data.

Threat​

Authenticated attacker from the Internet.

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: L
  • User interaction: N
  • Scope: C
  • Confidentiality: L
  • Integrity: L
  • Availability: L

Temporal​

  • Exploit code madurity: H
  • Remediation level: U
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L/E:H/RL:U/RC:C
  • Score:
    • Base: 7.4
    • Temporal: 7.4
  • Severity:
    • Base: High
    • Temporal: High

Code Examples​

Compliant code​

Implement a check for every fragment introduced to the application

public partial class WebForm : System.Web.UI.Page {
  protected void File_Load(object file, EventArgs e) {
    verifiedFile = secureFileContents(file, args*)
    runScrypt(verifiedFile);
  }
}

Non compliant code​

Some fragments can be inserted into the application without server side verification

public partial class WebForm : System.Web.UI.Page{
  protected void File_Load(object file, EventArgs e){
    runScrypt(file);
  }
}

Requirements​

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