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Ichyaboy
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      • Information Disclosure
        • Information disclosure in error messages
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      • Access Control
        • Unprotected admin functionality
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        • User role controlled by request parameter
        • User role can be modified in user profile
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        • User ID controlled by request parameter with data leakage in redirect
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        • Insecure direct object references
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      • Nosql Injection
        • Detecting NoSQL injection
        • Exploiting NoSQL operator injection to bypass authentication
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      • Api Testing
        • Exploiting an API endpoint using documentation
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    • đŸŽ¯Client-side topics
      • Cross-site scripting (XSS)
        • Stored XSS
          • Stored XSS into HTML context with nothing encoded
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        • Reflected XSS
          • Reflected XSS into HTML context with nothing encoded
          • Reflected XSS into attribute with angle brackets HTML encoded
          • Reflected XSS into a JavaScript string with angle brackets HTML encoded
          • Reflected XSS into HTML context with most tags and attributes blocked
          • Reflected XSS into HTML context with all tags blocked except custom ones
          • Reflected XSS with some SVG markup allowed
          • Reflected XSS in canonical link tag
          • Reflected XSS into a JavaScript string with single quote and backslash escaped
          • Reflected XSS into a JavaScript string with angle brackets and double quotes HTML encoded and single quotes escaped
          • Reflected XSS into a template literal with angle brackets, single, double quotes, backslash and backticks Unicode escaped
          • Reflected XSS with event handlers and href attributes blocked
          • Reflected XSS in a JavaScript URL with some characters blocked
        • DOM-based XSS
          • DOM XSS in document.write sink using source location.search
          • DOM XSS in innerHTML sink using source location.search
          • DOM XSS in jQuery anchor href attribute sink using location.search source
          • DOM XSS in jQuery selector sink using a hashchange event
          • DOM XSS in document.write sink using source location.search inside a select element
          • DOM XSS in AngularJS expression with angle brackets and double quotes HTML encoded
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        • CSP Bypass
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          • Reflected XSS with AngularJS sandbox escape without strings
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        • Common XSS Attacks
          • Exploiting cross site scripting to steal cookies
          • Exploiting cross site scripting to capture passwords
          • Exploiting XSS to perform CSRF
      • WebSockets
        • Manipulating WebSocket messages to exploit vulnerabilities
        • Cross site WebSocket hijacking
        • Manipulating the WebSocket handshake to exploit vulnerabilities
      • Cross-site Request forgery (CSRF)
        • CSRF vulnerability with no defenses
        • CSRF where token validation depends on request method
        • CSRF where token validation depends on token being present
        • CSRF where token is not tied to user session
        • CSRF where token is tied to non session cookie
        • CSRF where token is duplicated in cookie
        • SameSite Lax bypass via method override
        • SameSite Strict bypass via client side redirect
        • SameSite Strict bypass via sibling domain
        • SameSite Lax bypass via cookie refresh
        • CSRF where Referer validation depends on header being present
        • CSRF with broken Referer validation
      • Cross-origin resource sharing
        • CORS vulnerability with basic origin reflection
        • CORS vulnerability with trusted null origin
        • CORS vulnerability with trusted insecure protocols
      • Clickjacking
        • Basic clickjacking with CSRF token protection
        • Clickjacking with form input data prefilled from a URL parameter
        • Clickjacking with a frame buster script
        • Exploiting clickjacking vulnerability to trigger DOM based XSS
        • Multistep clickjacking
      • DOM-based vulnerabilities
        • DOM XSS using web messages
        • DOM XSS using web messages and a JavaScript URL
        • DOM XSS using web messages and JSON.parse
        • DOM based open redirection
        • DOM based cookie manipulation
        • Exploiting DOM clobbering to enable XSS
        • Clobbering DOM attributes to bypass HTML filters
  • Resources
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      • USING THE METASPLOIT FRAMEWORK
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      • Attacking Common Services
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    • 🏴Useful Scripts
      • NoSQL REGEX Password Length
      • NoSQL REGEX Password
      • Creds BruteForce CSRF Handling
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On this page
  • Description
  • Approach
  1. Portswigger Related
  2. Client-side topics
  3. DOM-based vulnerabilities

DOM based open redirection

Description

This lab contains a DOM-based open-redirection vulnerability. To solve this lab, exploit this vulnerability and redirect the victim to the exploit server.

Approach

After visiting the lab and navigating through it with the FoxyProxy extension enabled to proxy all requests through BurpSuite, I noticed an interesting link in the blog post request response:

<div class="is-linkback">
	<a href='#' onclick='returnUrl = /url=(https?:\/\/.+)/.exec(location); location.href = returnUrl ? returnUrl[1] : "/"'>Back to Blog</a>
</div>

The main issue lies in the fact that the code does not verify the safety or origin of the URL found by the regex. This means I can craft a malicious URL that includes a url parameter pointing to a site I control.

To exploit this vulnerability, I will craft a URL that includes a url parameter pointing to my exploit server. This will redirect the user to my malicious site when they click the "Back to Blog" link. Here is the request I will send:

GET /post?postId=1&url=https://exploit-0a1c002e044239fd81e3fbe80199000e.exploit-server.net/exploit HTTP/2
Host: 0af000d2047939b88129fcd6007d00fd.web-security-academy.net
Cookie: session=HYxcrtHjbPzOrqAhXltIlPfhwOAP95cG
...

by sending that request i can see that the lab is solved.

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