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Ubuntu.comUB:CVE-2021-38598

HistoryAug 23, 2021 - 12:00 a.m.

CVE-2021-38598

2021-08-2300:00:00

ubuntu.com

openstack neutron

hardware address impersonation

denial of service

interception

netfilter-based platform

linuxbridge driver

ebtables-nft

virtual switch

malicious packets

server instance control.

CVSS2

5.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:P/A:P

CVSS3

9.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS

0.001

Percentile

40.6%

JSON

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.

Bugs

<https://launchpad.net/bugs/1938670>

Notes

Author	Note
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.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchneutron< 2:12.1.1-0ubuntu8.1UNKNOWN
ubuntu20.04noarchneutron< 2:16.4.2-0ubuntu6.2UNKNOWN
ubuntu16.04noarchneutron< anyUNKNOWN