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MEDIUM · 5.9

CVE-2018-15311

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, lead...

Vulnerability Description

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 Score

5.9

MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
F5Big-Ip Local Traffic Manager>= 11.5.1, <= 11.5.6
F5Big-Ip Application Acceleration Manager>= 11.5.1, <= 11.5.6
F5Big-Ip Advanced Firewall Manager>= 11.5.1, <= 11.5.6
F5Big-Ip Analytics>= 11.5.1, <= 11.5.6
F5Big-Ip Access Policy Manager>= 11.5.1, <= 11.5.6
F5Big-Ip Application Security Manager>= 11.5.1, <= 11.5.6
F5Big-Ip Domain Name System>= 11.5.1, <= 11.5.6
F5Big-Ip Edge Gateway>= 11.5.1, <= 11.5.6
F5Big-Ip Fraud Protection Service>= 11.5.1, <= 11.5.6
F5Big-Ip Global Traffic Manager>= 11.5.1, <= 11.5.6
F5Big-Ip Link Controller>= 11.5.1, <= 11.5.6
F5Big-Ip Policy Enforcement Manager>= 11.5.1, <= 11.5.6
F5Big-Ip Webaccelerator>= 11.5.1, <= 11.5.6

References

FAQ

What is CVE-2018-15311?

CVE-2018-15311 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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, lead...

How severe is CVE-2018-15311?

CVE-2018-15311 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2018-15311?

Check the references section above for vendor advisories and patch information. Affected products include: F5 Big-Ip Local Traffic Manager, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Access Policy Manager.