Ubuntu Security Notice USN-698-2 – It was discovered that Nagios was vulnerable to a Cross-site request forgery (CSRF) vulnerability. If an authenticated nagios user were tricked into clicking a link on a specially crafted web page, an attacker could trigger commands to be processed by Nagios and execute arbitrary programs. This update alters Nagios behaviour by disabling submission of CMD_CHANGE commands. It was discovered that Nagios did not properly parse commands submitted using the web interface. An authenticated user could use a custom form or a browser addon to bypass security restrictions and submit unauthorized commands.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/73359/USN-698-2.txt
Source: https://packetstormsecurity.com/files/73359/Ubuntu-Security-Notice-698-2.html