CVE-2019-15753
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 9.1 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 2.61% probability · 85th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- openstack/os-vif
- Source
- cve@mitre.org
References
- http://www.openwall.com/lists/oss-security/2019/08/29/2Mailing List, Patch, Third Party Advisory
- https://launchpad.net/bugs/1837252Issue Tracking, Third Party Advisory
- https://review.opendev.org/672834Patch
- https://review.opendev.org/678098Patch
- https://security.openstack.org/ossa/OSSA-2019-004.htmlPatch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2019/08/29/2Mailing List, Patch, Third Party Advisory
- https://launchpad.net/bugs/1837252Issue Tracking, Third Party Advisory
- https://review.opendev.org/672834Patch
- https://review.opendev.org/678098Patch
- https://security.openstack.org/ossa/OSSA-2019-004.htmlPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.