CVE-2021-38598

Publication date 23 August 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
neutron	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 2:16.4.2-0ubuntu6.2
	18.04 LTS bionic	Fixed 2:12.1.1-0ubuntu8.1
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Not in release

Notes

mdeslaur

This issue was fixed in (2:16.4.1-0ubuntu2) in focal-updates and (2:18.1.0-0ubuntu2) in hirsute-updates, and was later released to -security.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
neutron	Upstream: 4245963

Severity score breakdown

Parameter	Value
Base score	9.1 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-6067-1
OpenStack Neutron vulnerabilities
10 May 2023