SOL21230183 - NTP vulnerability CVE-2015-7976

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.

F5 responds to vulnerabilities in accordance with the Severityvalues published in the previous table. The Severityvalues and other security vulnerability parameters are defined in SOL4602: Overview of the F5 security vulnerability response policy.

For the ntpd component
By default, the BIG-IP, BIG-IQ, or Enterprise Manager system’s NTP configuration does not permit the source to query or modify the NTP service on the system. If you have modified the default NTP configuration to allow changes by remote client, you can use the directive “restrict default nomodify” and not allow untrusted hosts to make modifications.

For the ntpq component
To prevent a local user from exploiting this vulnerability when they are querying a remote NTP server, you can allow access to the BIG-IP or Enterprise Manager system over a secure network, and limit login access to only 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
• SOL13123: Managing BIG-IP product hotfixes (11.x - 12.x)
• SOL10025: Managing BIG-IP product hotfixes (10.x)
• SOL9502: BIG-IP hotfix matrix
• SOL15106: Managing BIG-IQ product hotfixes
• SOL15113: BIG-IQ hotfix matrix
• SOL12766: ARX hotfix matrix