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CVE-2019-15753

Published: 28 August 2019

In OpenStack os-vif 1.15.x before 1.15.2, and 1.16.0, a hard-coded MAC aging time of 0 disables MAC learning in linuxbridge, forcing obligatory Ethernet flooding of non-local destinations, which both impedes network performance and allows users to possibly view the content of packets for instances belonging to other tenants sharing the same network. Only deployments using the linuxbridge backend are affected. This occurs in PyRoute2.add() in internal/command/ip/linux/impl_pyroute2.py.

Notes

AuthorNote
mdeslaur
code introduced in 1.15.0

Priority

Low

Cvss 3 Severity Score

9.1

Score breakdown

Status

Package Release Status
python-os-vif
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Needed

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needed

kinetic Ignored
(end of life, was needed)
lunar Not vulnerable
(2.8.0-0ubuntu1)
mantic Not vulnerable
(2.8.0-0ubuntu1)
noble Not vulnerable
(2.8.0-0ubuntu1)
trusty Does not exist

upstream
Released (1.15.2)
xenial Does not exist

Severity score breakdown

Parameter Value
Base score 9.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H