Você pode usar esse script para corrigir a permissão do wordpress:
#!/bin/bash
#
# This script configures WordPress file permissions based on recommendations
# from http://codex.wordpress.org/Hardening_WordPress#File_permissions
#
# Author: Michael Conigliaro <mike [at] conigliaro [dot] org>
#
WP_OWNER=www-data # <-- wordpress owner
WP_GROUP=www-data # <-- wordpress group
WP_ROOT= # <-- wordpress root directory
WS_GROUP=www-data # <-- webserver group
# reset to safe defaults
find ${WP_ROOT} -exec chown ${WP_OWNER}:${WP_GROUP} {} \;
find ${WP_ROOT} -type d -exec chmod 755 {} \;
find ${WP_ROOT} -type f -exec chmod 644 {} \;
# allow wordpress to manage wp-config.php (but prevent world access)
chgrp ${WS_GROUP} ${WP_ROOT}/wp-config.php
chmod 660 ${WP_ROOT}/wp-config.php
# allow wordpress to manage wp-content
find ${WP_ROOT}/wp-content -exec chgrp ${WS_GROUP} {} \;
find ${WP_ROOT}/wp-content -type d -exec chmod 775 {} \;
find ${WP_ROOT}/wp-content -type f -exec chmod 664 {} \;
salve-o em um arquivo e execute-o e passe-o ao seu diretório de instalação wp:
wget https://gist.github.com/Adirael/3383404/raw/6c5446d56477426faeb709e5b807f00422acdea2/fix-wordpress-permissions.sh
chmod +x fix-wordpress-permissions.sh
sudo ./fix-wordpress-permissions.sh /var/www/html