Leunam's PortSwigger
  • 01 SQL Injection
    • 01 Lab: SQL injection vulnerability in WHERE clause allowing retrieval of hidden data
    • 02 Lab: SQL injection vulnerability allowing login bypass
    • 04 Lab: SQL injection attack, querying the database type and version on MySQL and Microsoft
    • 05 Lab: SQL injection attack, listing the database contents on non-Oracle databases
    • 06 Lab: SQL injection attack, listing the database contents on Oracle
    • 11 Lab: Blind SQL injection with conditional responses
    • 12 Lab: Blind SQL injection with conditional errors
    • 13 Lab: Visible error-based SQL injection
    • 14 Lab: Blind SQL injection with time delays
  • 02 Cross-site scripting
    • 03 Lab: DOM XSS in document.write sink using source location.search inside a select element
    • 04 Lab: DOM XSS in innerHTML sink using source location.search
    • 06 Lab: DOM XSS in jQuery selector sink using a hashchange event
    • 07 Lab: Reflected XSS into attribute with angle brackets HTML-encoded
    • 08 Lab: Stored XSS into anchor href attribute with double quotes HTML-encoded
    • 09 Lab: Reflected XSS into a JavaScript string with angle brackets HTML encoded
    • 22 Lab: Exploiting cross-site scripting to steal cookies
    • 24 Lab: Exploiting XSS to bypass CSRF defenses
  • 03 CSRF
    • 01 Lab: CSRF vulnerability with no defenses
  • 04 Clickjacking
    • 01 Lab: Basic clickjacking with CSRF token protection
    • 02 Lab: Clickjacking with form input data prefilled from a URL parameter
    • 03 Lab: Clickjacking with a frame buster script
  • 06 CORS
    • 01 Lab: CORS vulnerability with basic origin reflection
  • 10 OS Comand Injection
    • 02 Lab: Blind OS command injection with time delays
    • 03 Lab: Blind OS command injection with output redirection
  • 12 Path traversal
    • 01 Lab: File path traversal, simple case
  • 13 Access Control Vulnerability
    • 01 Lab: Unprotected admin functionality
    • 03 Lab: User role controlled by request parameter
    • 04 Lab User role can be modified in user profile 17efab5460ec808c8da6e67d210bf5a2
    • 05 Lab: User ID controlled by request parameter
    • 07 Lab: User ID controlled by request parameter with data leakage in redirect
    • 09 Lab: Insecure direct object references
  • 14 Authentication
    • 01 Lab: Username enumeration via different responses
    • 02 Lab: 2FA simple bypass
    • 03 Lab: Password reset broken logic
  • 15 WebSockets
    • 01 Lab: Manipulating WebSocket messages to exploit vulnerabilities
  • 16 Web cache deception
    • 01 Lab: Exploiting path mapping for web cache deception
  • 20 HTTP Host header attacks
    • 02 Lab: Host header authentication bypass
  • 22 File Upload vulnerabilities
    • 02 Lab Web shell upload via path traversal 17efab5460ec801980d1fa9a1e9e0b67
    • 03 Lab: Web shell upload via path traversal
  • 28 NoSQL Injection
    • 01 Lab Detecting NoSQL injection 17efab5460ec80e19ec7ee42c9d3a627
    • 02 Lab: Exploiting NoSQL injection to extract data
    • 04 Lab: Exploiting NoSQL operator injection to extract unknown fields
  • 29 API Testing
    • 01 Lab: Exploiting server-side parameter pollution in a query string
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  • Objetivo
  • Solución
  1. 10 OS Comand Injection

03 Lab: Blind OS command injection with output redirection

Previous02 Lab: Blind OS command injection with time delaysNext12 Path traversal

Last updated 3 months ago

Objetivo

This lab contains a blind OS command injection vulnerability in the feedback function.

The application executes a shell command containing the user-supplied details. The output from the command is not returned in the response. However, you can use output redirection to capture the output from the command. There is a writable folder at:

/var/www/images/

The application serves the images for the product catalog from this location. You can redirect the output from the injected command to a file in this folder, and then use the image loading URL to retrieve the contents of the file.

To solve the lab, execute the whoami command and retrieve the output.

Solución

Suponemos que la funcionalidad de feedback se realiza usando el siguiente script:

mail -s "This site is great" -a From:[email protected] [email protected]

  1. Evaluamos la sección de Feedback a travez del repeater, los campos email

  2. Añadimos ||whoami>/var/www/images/output.txt|| en el campo email , con el espacio an inicio, para añadir una instrucción extra.

    Quedando de la siguiente manera la ejecución, ocasionando la escritura de un archivo, recordemos que debemos elegir una dirección u archivo correcto, ademas que sabemos, el directorio tiene permiso de escritura:

    mail -s "This site is great" -a From:[email protected] [email protected] **||whoami>/var/www/images/output.txt||**
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