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CVE-2022-32792 is an out-of-bounds write vulnerability in WebKit’s JavaScriptCore FTL JIT compiler, specifically the B3ReduceStrength optimization phase. Pre-fix range analysis handled SExt8, SExt16, and SExt32 operations as though sign extension preserved the source integer range. This could cause the optimizer to incorrectly determine that CheckAdd, CheckSub, or CheckMul could not overflow or underflow and replace the checked operation with an unchecked arithmetic operation. Crafted JavaScript can exploit the resulting incorrect Int32 range assumptions to bypass array-bounds checks and access memory outside an array’s allocated bounds. The fix introduced sign-extension-aware range calculation for these operations.
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An out-of-bounds write vulnerability in Safari/WebKit JavaScriptCore's B3ReduceStrength optimization logic caused by incorrect range analysis for sign extension (SExt) operations, which can wrongly eliminate overflow checks and enable OOB access during JIT-compiled JavaScript execution.
An out-of-bounds write vulnerability in Safari/WebKit JavaScriptCore caused by incorrect range analysis for sign extension operations in the B3ReduceStrength optimization phase, which can wrongly remove overflow/underflow checks and enable OOB access.
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