Microsoft MsMpEng - Use-After-Free via Saved Callers

Author: Google Security Research
type: dos
platform: windows
port: 
date_added: 2017-05-30 
date_updated: 2017-05-30 
verified: 1 
codes: CVE-2017-8541 
tags: Use After Free (UAF)
aliases:  
screenshot_url:  
application_url: 

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1259

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:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42092.zip