F5 BIG-IP up to 15.1.0.4 MCPD Context Message SYN Flood resource consumption

Summaryinfo

A vulnerability identified as problematic has been detected in F5 BIG-IP up to 15.1.0.4. This issue affects some unknown processing of the component MCPD Context Message Handler. This manipulation as part of SYN Flood causes resource consumption. This vulnerability is handled as CVE-2020-5921. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in F5 BIG-IP up to 15.1.0.4 (Firewall Software). It has been declared as problematic. Affected by this vulnerability is some unknown functionality of the component MCPD Context Message Handler. The manipulation as part of a SYN Flood leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

in BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, Syn flood causes large number of MCPD context messages destined to secondary blades consuming memory leading to MCPD failure. This issue affects only VIPRION hosts with two or more blades installed. Single-blade VIPRION hosts are not affected.

The weakness was released 08/26/2020 (Website). It is possible to read the advisory at support.f5.com. This vulnerability is known as CVE-2020-5921 since 01/06/2020. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/27/2020). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entry connected to this vulnerability is available at VDB-160352. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• F5

Name

• BIG-IP

Version

• 11.6.5.0
• 11.6.5.1
• 11.6.5.2
• 12.1.5.0
• 12.1.5.1
• 13.1.3.0
• 13.1.3.1
• 13.1.3.2
• 13.1.3.3
• 13.1.3.4
• 14.1.2.0
• 14.1.2.1
• 14.1.2.2
• 14.1.2.3
• 14.1.2.4
• 14.1.2.5
• 14.1.2.6
• 15.0.1.0
• 15.0.1.1
• 15.0.1.2
• 15.0.1.3
• 15.1.0.0
• 15.1.0.1
• 15.1.0.2
• 15.1.0.3
• 15.1.0.4

License

• commercial

Website

• Vendor: https://f5.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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

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