qufighter / cr Goto Github PK
View Code? Open in Web Editor NEWdocument.CreateElement- except structured and nested like the HTML DOM. Turn HTML into Javascript.
License: Other
document.CreateElement- except structured and nested like the HTML DOM. Turn HTML into Javascript.
License: Other
Your unescapeHtml
utility function in Cr.js
is flawed and introduces a XSS vulnerability.
Here is a snippet based on your code:
(function(str) { //trick used to make HTMLentiites work inside textNodes
if(str.length < 1)return str;
var temp = this.doc.createElement("div");
str = str.replace(/<\/?\w(?:[^"'>]|"[^"]*"|'[^']*')*>/gmi, '');
temp.innerHTML = str;
var result = temp.childNodes[0].nodeValue;
this.empty(temp);
return result;
}).call({doc:document,empty:function(){}},'<<div></div>img onerror="alert(\'XSS\')" src>')
If you run the above snippet on a site without CSP (e.g. example.com), then you will see an alert dialog (=scripts run). If you run it on Github (which declares a CSP), then you will see an error message in the console:
Refused to execute inline event handler because it violates the following Content Security Policy directive: "script-src assets-cdn.github.com". Either the 'unsafe-inline' keyword, a hash ('sha256-...'), or a nonce ('nonce-...') is required to enable inline execution.
For safer alternatives, see https://stackoverflow.com/questions/7394748/whats-the-right-way-to-decode-a-string-that-has-special-html-entities-in-it
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