CVE-2018-15311

Severity

43%

Complexity

86%

Confidentiality

48%

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.

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.

CVSS 3.0 Base Score 5.9. CVSS Attack Vector: network. CVSS Attack Complexity: high. CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 4.3. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:P).

Overview

Type

F5

First reported 6 years ago

2018-10-10 14:29:00

Last updated 5 years ago

2019-10-03 00:03:00

Affected Software

F5 Networks Big-IP Local Traffic Manager (LTM)

F5 Big-IP Application Acceleration Manager (AAM)

F5 Big-IP Advanced Firewall Manager (AFM)

F5 Big-IP Analytics

F5 Big-IP Access Policy Manager (APM)

F5 Big-IP Application Security Manager (ASM)

F5 Big-IP Domain Name System (DNS)

F5 Big-IP Edge Gateway

F5 Big-IP Fraud Protection Service (FPS)

F5 Big-IP Global Traffic Manager (GTM)

F5 Big-IP Link Controller

F5 Big-IP Policy Enforcement Manager (PEM)

F5 Big-IP WebAccelerator

References

https://support.f5.com/csp/article/K07550539

Mitigation, Vendor Advisory

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