SOL17515 - NTP vulnerability CVE-2015-7855

Vulnerability Recommended Actions

If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by upgrading to a version listed in theVersions known to be not vulnerable column. If the table lists only an older version than what you are currently running, or does not list a non-vulnerable version, then no upgrade candidate currently exists.

The default configuration for the F5 products listed as vulnerable does not expose this vulnerability to any remote attack. To mitigate this vulnerability, do not enable NTP mode 7 functionality and restrict the use of mode 6 and mode 7 requests in your environment. If these features have been enabled, access control lists should be used to restrict access to remote NTP instances. In addition, you should permit access to F5 products only over a secure network and limit login access to trusted users. For more information, refer to SOL13092: Overview of securing access to the BIG-IP system.

Supplemental Information

• SOL9970: Subscribing to email notifications regarding F5 products
• SOL9957: Creating a custom RSS feed to view new and updated documents
• SOL4602: Overview of the F5 security vulnerability response policy
• SOL4918: Overview of the F5 critical issue hotfix policy
• SOL167: Downloading software and firmware from F5