Privilege escalation in F5 BIG-IP

1) Race condition

EUVDB-ID: #VU6527

Risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-9256

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to gain elevated privileges on the target system.

The weakness exists due to race condition during the enforcement of permissions by the iControl component when permissions are assigned to a user and the role_map feature is not reloaded between the time permissions are changed and the user's next change request. A remote attacker can gain elevated privileges and conduct further attacks.

Successful exploitation of the vulnerability may result in access to the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

BIG-IP AAM:

BIG-IP AAM: 12.0.0 - 12.1.2

BIG-IP AFM: 12.0.0 - 12.1.2

BIG-IP Analytics: 12.0.0 - 12.1.2

BIG-IP APM: 12.0 HF1 - 12.1.2

BIG-IP ASM: 12.0.0 - 12.1.2

BIG-IP DNS: 12.0.0 - 12.1.2

BIG-IP Link Controller: 12.0.0 - 12.1.2

BIG-IP LTM: 12.0.0 - 12.1.2

BIG-IP PEM: 12.0.0 - 12.1.2

BIG-IP WebSafe: 12.0 - 12.1.2

External links

http://support.f5.com/csp/article/K47284724

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.