F5 BIG-IP up to 13.1.0.5 vCMP access control

Summaryinfo

A vulnerability categorized as problematic has been discovered in F5 BIG-IP up to 13.1.0.5. This affects an unknown part of the component vCMP. Executing a manipulation can lead to access control. This vulnerability appears as CVE-2018-5518. The attacker needs to be present on the local network. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in F5 BIG-IP up to 13.1.0.5 (Firewall Software) and classified as problematic. This vulnerability affects an unknown functionality of the component vCMP. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect availability. CVE summarizes:

On F5 BIG-IP 13.0.0-13.1.0.5 or 12.0.0-12.1.3.3, malicious root users with access to a VCMP guest can cause a disruption of service on adjacent VCMP guests running on the same host. Exploiting this vulnerability causes the vCMPd process on the adjacent VCMP guest to restart and produce a core file. This issue is only exploitable on a VCMP guest which is operating in "host-only" or "bridged" mode. VCMP guests which are "isolated" are not impacted by this issue and do not provide mechanism to exploit the vulnerability. Guests which are deployed in "Appliance Mode" may be impacted however the exploit is not possible from an Appliance Mode guest. To exploit this vulnerability root access on a guest system deployed as "host-only" or "bridged" mode is required.

The bug was discovered 05/01/2018. The weakness was presented 05/02/2018 (Website). The advisory is shared for download at support.f5.com. This vulnerability was named CVE-2018-5518 since 01/12/2018. The attack can only be done within the local network. The successful exploitation needs a single authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 118619 (F5 Networks BIG-IP : vCMP vulnerability (K03165684)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370962 (F5 BIG-IP ASM vCMP Disruption of Service Vulnerability (K03165684)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118619). See VDB-117330, VDB-117329, VDB-117327 and VDB-117325 for similar entries. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 12.1.3.0
• 12.1.3.1
• 12.1.3.2
• 12.1.3.3
• 13.1.0
• 13.1.0.0
• 13.1.0.1
• 13.1.0.2
• 13.1.0.3
• 13.1.0.4
• 13.1.0.5

License

• commercial

Website

• Vendor: https://f5.com/

CPE 2.3info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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