Listen to this Post
The vulnerability CVE-2024-0519 is a high-severity type confusion issue within the V8 JavaScript engine. Type confusion occurs when code initializes a resource as one type but is later accessed as an incompatible type, violating memory safety. In V8, this flaw was rooted in the incorrect side-effect modeling of certain JavaScript operations during the compiler’s optimization phase, specifically within the TurboFan just-in-time (JIT) compiler. The compiler would fail to account for the possibility that an operation could change a variable’s type, leading to incorrect optimization. This created a discrepancy between the optimized code’s expectations and the actual object’s layout in memory. An attacker could craft malicious JavaScript that, when executed, triggers this flaw, causing the engine to misinterpret the object’s structure in memory. This misinterpretation allows for read/write primitives outside the bounds of the object’s memory, potentially leading to arbitrary code execution within the context of the browser renderer process.
Platform: Chromium Browsers
Version: Prior to 121.0.6167.85
Vulnerability: Type Confusion
Severity: High
date: 2024-01-16
Prediction: Patch: 2024-01-16
What Undercode Say:
`git log –oneline –grep=”0519″ –grep=”type confusion”`
`v8/src/compiler/operation-typer.cc`
`TEST_F(OperationTyperTest, ConfusionCheck)`
How Exploit:
Malicious JavaScript triggers JIT optimization path. Crafted code exploits incorrect type assumptions. Achieves out-of-bounds memory access.
Protection from this CVE
Update browser immediately. Apply available security patches. Disable JavaScript.
Impact:
Arbitrary code execution. Browser renderer compromise. Information disclosure.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
