F5 BIG-IP up to 11.5.6/11.6.3.2/12.1.3.5/13.1.0.5 LRO resource management

Summaryinfo

A vulnerability, which was classified as problematic, has been found in F5 BIG-IP up to 11.5.6/11.6.3.2/12.1.3.5/13.1.0.5. The impacted element is an unknown function of the component LRO. The manipulation leads to resource management. This vulnerability is documented as CVE-2018-15311. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in F5 BIG-IP up to 11.5.6/11.6.3.2/12.1.3.5/13.1.0.5 (Firewall Software) and classified as problematic. This issue affects an unknown functionality of the component LRO. The manipulation with an unknown input leads to a resource management vulnerability. Using CWE to declare the problem leads to CWE-399. Impacted is availability. The summary by CVE is:

When F5 BIG-IP 13.0.0-13.1.0.5, 12.1.0-12.1.3.5, 11.6.0-11.6.3.2, or 11.5.1-11.5.6 is processing specially crafted TCP traffic with the Large Receive Offload (LRO) feature enabled, TMM may crash, leading to a failover event. This vulnerability is not exposed unless LRO is enabled, so most affected customers will be on 13.1.x. LRO has been available since 11.4.0 but is not enabled by default until 13.1.0.

The bug was discovered 10/10/2018. The weakness was released 10/10/2018 (Website). It is possible to read the advisory at support.f5.com. The identification of this vulnerability is CVE-2018-15311 since 08/14/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 118624 (F5 Networks BIG-IP : TMM with LRO vulnerability (K07550539)), 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.

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 (118624). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 11.5.0
• 11.5.1
• 11.5.2
• 11.5.3
• 11.5.4
• 11.5.5
• 11.5.6
• 11.6.3.0
• 11.6.3.1
• 11.6.3.2
• 12.1.3.0
• 12.1.3.1
• 12.1.3.2
• 12.1.3.3
• 12.1.3.4
• 12.1.3.5
• 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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CPE 2.2info

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Be aware that VulDB is the high quality source for vulnerability data.

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