CVE Vulnerabilities

CVE-2021-23011

Uncontrolled Resource Consumption

Published: May 10, 2021 | Modified: May 24, 2021
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
Ubuntu

On versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.4, 12.1.x before 12.1.6, and 11.6.x before 11.6.5.3, when the BIG-IP system is buffering packet fragments for reassembly, the Traffic Management Microkernel (TMM) may consume an excessive amount of resources, eventually leading to a restart and failover event. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness

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.

Affected Software

Name Vendor Start Version End Version
Big-ip_access_policy_manager F5 16.0.0 *
Big-ip_advanced_firewall_manager F5 16.0.0 *
Big-ip_application_acceleration_manager F5 16.0.0 *
Big-ip_analytics F5 16.0.0 *
Big-ip_application_security_manager F5 16.0.0 *
Big-ip_domain_name_system F5 16.0.0 *
Big-ip_global_traffic_manager F5 16.0.0 *
Big-ip_fraud_protection_service F5 16.0.0 *
Big-ip_link_controller F5 16.0.0 *
Big-ip_local_traffic_manager F5 16.0.0 *
Big-ip_policy_enforcement_manager F5 16.0.0 *
Big-ip_advanced_web_application_firewall F5 16.0.0 *
Big-ip_ddos_hybrid_defender F5 16.0.0 *
Big-ip_ssl_orchestrator F5 16.0.0 *
Big-ip_application_acceleration_manager F5 14.1.0 *
Big-ip_local_traffic_manager F5 14.1.0 *
Big-ip_advanced_web_application_firewall F5 14.1.0 *
Big-ip_advanced_firewall_manager F5 14.1.0 *
Big-ip_analytics F5 14.1.0 *
Big-ip_application_security_manager F5 14.1.0 *
Big-ip_access_policy_manager F5 14.1.0 *
Big-ip_ddos_hybrid_defender F5 14.1.0 *
Big-ip_domain_name_system F5 14.1.0 *
Big-ip_fraud_protection_service F5 14.1.0 *
Big-ip_global_traffic_manager F5 14.1.0 *
Big-ip_link_controller F5 14.1.0 *
Big-ip_policy_enforcement_manager F5 14.1.0 *
Big-ip_policy_enforcement_manager F5 11.6.1 *
Big-ip_local_traffic_manager F5 11.6.1 *
Big-ip_link_controller F5 11.6.1 *
Big-ip_global_traffic_manager F5 11.6.1 *
Big-ip_fraud_protection_service F5 11.6.1 *
Big-ip_domain_name_system F5 11.6.1 *
Big-ip_ddos_hybrid_defender F5 11.6.1 *
Big-ip_application_security_manager F5 11.6.1 *
Big-ip_application_acceleration_manager F5 11.6.1 *
Big-ip_analytics F5 11.6.1 *
Big-ip_advanced_web_application_firewall F5 11.6.1 *
Big-ip_advanced_firewall_manager F5 11.6.1 *
Big-ip_access_policy_manager F5 11.6.1 *
Big-ip_access_policy_manager F5 13.1.0 *
Big-ip_access_policy_manager F5 15.1.0 *
Big-ip_application_security_manager F5 15.1.0 *
Big-ip_advanced_firewall_manager F5 15.1.0 *
Big-ip_advanced_web_application_firewall F5 15.1.0 *
Big-ip_analytics F5 15.1.0 *
Big-ip_application_acceleration_manager F5 15.1.0 *
Big-ip_ddos_hybrid_defender F5 15.1.0 *
Big-ip_domain_name_system F5 15.1.0 *
Big-ip_fraud_protection_service F5 15.1.0 *
Big-ip_global_traffic_manager F5 15.1.0 *
Big-ip_link_controller F5 15.1.0 *
Big-ip_local_traffic_manager F5 15.1.0 *
Big-ip_policy_enforcement_manager F5 15.1.0 *
Big-ip_ssl_orchestrator F5 15.1.0 *
Big-ip_advanced_firewall_manager F5 13.1.0 *
Big-ip_advanced_web_application_firewall F5 13.1.0 *
Big-ip_analytics F5 13.1.0 *
Big-ip_application_acceleration_manager F5 13.1.0 *
Big-ip_application_security_manager F5 13.1.0 *
Big-ip_ddos_hybrid_defender F5 13.1.0 *
Big-ip_domain_name_system F5 13.1.0 *
Big-ip_fraud_protection_service F5 13.1.0 *
Big-ip_global_traffic_manager F5 13.1.0 *
Big-ip_link_controller F5 13.1.0 *
Big-ip_local_traffic_manager F5 13.1.0 *
Big-ip_policy_enforcement_manager F5 13.1.0 *
Big-ip_ssl_orchestrator F5 13.1.0 *
Big-ip_ssl_orchestrator F5 14.1.0 *
Big-ip_access_policy_manager F5 12.1.0 *
Big-ip_advanced_firewall_manager F5 12.1.0 *
Big-ip_advanced_web_application_firewall F5 12.1.0 *
Big-ip_analytics F5 12.1.0 *
Big-ip_application_acceleration_manager F5 12.1.0 *
Big-ip_application_security_manager F5 12.1.0 *
Big-ip_ddos_hybrid_defender F5 12.1.0 *
Big-ip_domain_name_system F5 12.1.0 *
Big-ip_fraud_protection_service F5 12.1.0 *
Big-ip_global_traffic_manager F5 12.1.0 *
Big-ip_link_controller F5 12.1.0 *
Big-ip_local_traffic_manager F5 12.1.0 *
Big-ip_policy_enforcement_manager F5 12.1.0 *
Big-ip_ssl_orchestrator F5 11.6.1 *
Big-ip_ssl_orchestrator F5 12.1.0 *

Extended Description

Limited resources include memory, file system storage, database connection pool entries, and CPU. If an attacker can trigger the allocation of these limited resources, but the number or size of the resources is not controlled, then the attacker could cause a denial of service that consumes all available resources. This would prevent valid users from accessing the product, and it could potentially have an impact on the surrounding environment. For example, a memory exhaustion attack against an application could slow down the application as well as its host operating system. There are at least three distinct scenarios which can commonly lead to resource exhaustion:

Resource exhaustion problems are often result due to an incorrect implementation of the following situations:

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References