Microsoft MsMpEng - Use-After-Free via Saved Callers

EDB-ID: 42092
Author: Google Security Research
Published: 2017-05-30
CVE: CVE-2017-8541
Type: Dos
Platform: Windows
Aliases: N/A
Advisory/Source: Link
Tags: Use After Free
Vulnerable App: N/A

In JsRuntimeState::setCaller, it saves the current caller in the JsRuntimeState object(rcx+158h in 64-bit). But the garbage collector doesn't mark this saved value. So it results in a UAF.

Unlike in our test environment(Linux), it doesn't make reliable crashes on Windows. So I used another bug(#1258) to confirm the bug. If the UAF bug doesn't exist, the "crash" function will not be called(See poc.js).

The password of the zip file is "calleruaf"

Proof of Concept:

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