Bug 1747255 (CVE-2019-15753)

Summary: CVE-2019-15753 python-os-vif: Hard-coded MAC aging time of 0 disables MAC learning in linuxbridge
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dbecker, jjoyce, jschluet, kbasil, lhh, lpeer, mburns, rhos-maint, sclewis, slinaber, tvignaud
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Clone Of: Environment:
Last Closed: 2019-09-19 22:19:58 UTC Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1747256    
Bug Blocks: 1747257    

Description Pedro Sampaio 2019-08-30 01:21:49 UTC 
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.

Upstream bug:

https://review.opendev.org/#/c/672834/
https://review.opendev.org/#/c/678098/

References:

https://security.openstack.org/ossa/OSSA-2019-004.html
https://www.openwall.com/lists/oss-security/2019/08/29/2
Comment 1 Pedro Sampaio 2019-08-30 01:22:03 UTC 
Created python-os-vif tracking bugs for this issue:

Affects: openstack-rdo [bug 1747256]
Comment 3 Nick Tait 2019-10-03 21:10:40 UTC 
Statement:

Red Hat OpenStack Platform 10, 13, & 14:
This vulnerability has been rated as having a security impact of Moderate. The vulnerable code is not present in the python-os-vif packages provided, therefore these releases of Red Hat OpenStack Platform are unaffected.