CVE-2016-9256: Race Condition
First published: Tue May 09 2017(Updated: )
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 role_map 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.
Credit: f5sirt@f5.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Riverbed SteelApp Traffic Manager | =12.0.0 | |
| Riverbed SteelApp Traffic Manager | =12.1.0 | |
| Riverbed SteelApp Traffic Manager | =12.1.1 | |
| Riverbed SteelApp Traffic Manager | =12.1.2 | |
| F5 BIG-IP Application Acceleration Manager | =12.0.0 | |
| F5 BIG-IP Application Acceleration Manager | =12.1.0 | |
| F5 BIG-IP Application Acceleration Manager | =12.1.1 | |
| F5 BIG-IP Application Acceleration Manager | =12.1.2 | |
| F5 BIG-IP Advanced Firewall Manager | =12.0.0 | |
| F5 BIG-IP Advanced Firewall Manager | =12.1.0 | |
| F5 BIG-IP Advanced Firewall Manager | =12.1.1 | |
| F5 BIG-IP Advanced Firewall Manager | =12.1.2 | |
| F5 BIG-IP Analytics | =12.0.0 | |
| F5 BIG-IP Analytics | =12.1.0 | |
| F5 BIG-IP Analytics | =12.1.1 | |
| F5 BIG-IP Analytics | =12.1.2 | |
| F5 Access Policy Manager | =12.0.0 | |
| F5 Access Policy Manager | =12.1.0 | |
| F5 Access Policy Manager | =12.1.1 | |
| F5 Access Policy Manager | =12.1.2 | |
| F5 Application Security Manager | =12.0.0 | |
| F5 Application Security Manager | =12.1.0 | |
| F5 Application Security Manager | =12.1.1 | |
| F5 Application Security Manager | =12.1.2 | |
| F5 BIG-IP | =12.0.0 | |
| F5 BIG-IP | =12.1.0 | |
| F5 BIG-IP | =12.1.1 | |
| F5 BIG-IP | =12.1.2 | |
| F5 BIG-IP Link Controller | =12.0.0 | |
| F5 BIG-IP Link Controller | =12.1.0 | |
| F5 BIG-IP Link Controller | =12.1.1 | |
| F5 BIG-IP Link Controller | =12.1.2 | |
| F5 BIG-IP Policy Enforcement Manager | =12.0.0 | |
| F5 BIG-IP Policy Enforcement Manager | =12.1.0 | |
| F5 BIG-IP Policy Enforcement Manager | =12.1.1 | |
| F5 BIG-IP Policy Enforcement Manager | =12.1.2 | |
| F5 WebSafe | =12.0.0 | |
| F5 WebSafe | =12.1.0 | |
| F5 WebSafe | =12.1.1 | |
| F5 WebSafe | =12.1.2 |
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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.
- agent/type
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/author
- agent/last-modified-date
- agent/first-publish-date
- agent/description
- agent/event
- agent/source
- agent/weakness
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/f5
- canonical/riverbed steelapp traffic manager
- version/riverbed steelapp traffic manager/12.0.0
- version/riverbed steelapp traffic manager/12.1.0
- version/riverbed steelapp traffic manager/12.1.1
- version/riverbed steelapp traffic manager/12.1.2
- canonical/f5 big-ip application acceleration manager
- version/f5 big-ip application acceleration manager/12.0.0
- version/f5 big-ip application acceleration manager/12.1.0
- version/f5 big-ip application acceleration manager/12.1.1
- version/f5 big-ip application acceleration manager/12.1.2
- canonical/f5 big-ip advanced firewall manager
- version/f5 big-ip advanced firewall manager/12.0.0
- version/f5 big-ip advanced firewall manager/12.1.0
- version/f5 big-ip advanced firewall manager/12.1.1
- version/f5 big-ip advanced firewall manager/12.1.2
- canonical/f5 big-ip analytics
- version/f5 big-ip analytics/12.0.0
- version/f5 big-ip analytics/12.1.0
- version/f5 big-ip analytics/12.1.1
- version/f5 big-ip analytics/12.1.2
- canonical/f5 access policy manager
- version/f5 access policy manager/12.0.0
- version/f5 access policy manager/12.1.0
- version/f5 access policy manager/12.1.1
- version/f5 access policy manager/12.1.2
- canonical/f5 application security manager
- version/f5 application security manager/12.0.0
- version/f5 application security manager/12.1.0
- version/f5 application security manager/12.1.1
- version/f5 application security manager/12.1.2
- canonical/f5 big-ip
- version/f5 big-ip/12.0.0
- version/f5 big-ip/12.1.0
- version/f5 big-ip/12.1.1
- version/f5 big-ip/12.1.2
- canonical/f5 big-ip link controller
- version/f5 big-ip link controller/12.0.0
- version/f5 big-ip link controller/12.1.0
- version/f5 big-ip link controller/12.1.1
- version/f5 big-ip link controller/12.1.2
- canonical/f5 big-ip policy enforcement manager
- version/f5 big-ip policy enforcement manager/12.0.0
- version/f5 big-ip policy enforcement manager/12.1.0
- version/f5 big-ip policy enforcement manager/12.1.1
- version/f5 big-ip policy enforcement manager/12.1.2
- canonical/f5 websafe
- version/f5 websafe/12.0.0
- version/f5 websafe/12.1.0
- version/f5 websafe/12.1.1
- version/f5 websafe/12.1.2