CVE-2020-23315: ASSERTION (pFuncBody->GetYieldRegister() == oldYieldRegister) failed in Js::DebugContext::RundownSourcesAndReparse · Issue #6453 · chakra-core/ChakraCore

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ASSERTION (pFuncBody->GetYieldRegister() == oldYieldRegister) failed in Js::DebugContext::RundownSourcesAndReparse #6453

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owl337 opened this issue

Jun 1, 2020

· 0 comments

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ChakraCore version:

version 1.12.0.0-beta

Build Commond

./build.sh --debug

OS

Ubuntu 16.04.6 LTS (Linux 4.4.0-142-generic x86_64)

Test case

function test0() {
  var func2 = (async (xsbazt = hkvvxr(x)) => [...[
        -2,
      ]]);
  var a = -191;
  func3(a);
}

function Run(){
    WScript.Echo('PASSED');
}


WScript.Attach(Run);

Output

ASSERTION 202914: (ChakraCore/lib/Runtime/Debug/DebugContext.cpp, line 359) pFuncBody->GetYieldRegister() == oldYieldRegister
 Failure: (pFuncBody->GetYieldRegister() == oldYieldRegister)
Illegal instruction

Credits: This vulnerability is detected by chong from OWL337.

owl337 changed the title DebugBreak in Js::DebugContext::RundownSourcesAndReparse ASSERTION (pFuncBody->GetYieldRegister() == oldYieldRegister) failed in Js::DebugContext::RundownSourcesAndReparse

Jun 1, 2020

2 participants