CVE-2016-9256: Race Condition
In F5 BIG-IP 12.1.0 through 12.1.2, permissions enforced by iControl can lag behind the actual permissions assigned to a user if the rolemap is not reloaded between the time the permissions are changed and the time of the user's next request. This is a race condition that occurs rarely in normal usage; the typical period in which this is possible is limited to at most a few seconds after the permission change.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2016-9256?
The severity of CVE-2016-9256 is classified as high due to the potential for unauthorized access to user permissions.
How do I fix CVE-2016-9256?
To fix CVE-2016-9256, ensure you reload the role map in the iControl application immediately after changing user permissions.
Which F5 BIG-IP versions are affected by CVE-2016-9256?
Affected F5 BIG-IP versions include 12.1.0 through 12.1.2 and version 12.0.0 for certain components.
What causes CVE-2016-9256?
CVE-2016-9256 is caused by a race condition that arises when user permissions are changed but the role map is not reloaded before the next user request.
Is CVE-2016-9256 exploitable by attackers?
Yes, CVE-2016-9256 is exploitable, potentially allowing attackers to gain unauthorized access to system resources.