CVE-2019-15753 OpenStack os-vif Ageing time of 0 disables linuxbridge MAC learning
Hard-coded MAC aging in OpenStack os-vif linuxbridge backend causes network flooding, allowing cross-tenant packet sniffing and performance degradation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-15753?
CVE-2019-15753 is a critical vulnerability in n/a, published on 28 Aug 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2019-15753?
5 open source packages ship an affected version, including os-vif. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
os-vif PyPI | From 1.15.0 | 1.15.2, 1.17.0 |
os-vif PyPI | From 1.15.0 | 1.15.2 |
os-vif PyPI | From 1.15.0 | 1.15.2 |
os-vif PyPI | From 1.16.0 | 1.17.0 |
os-vif PyPI | From 1.16.0 | 1.17.0 |
Products include Openstack Os-Vif.
How do I fix CVE-2019-15753?
Upgrade os-vif to a fixed version for your release line: 1.15.2 or 1.17.0.
Is CVE-2019-15753 being exploited?
There is no known exploitation of CVE-2019-15753 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2019-15753, GHSA-mcpw-cp35-p3h8, PYSEC-2026-440, UBUNTU-CVE-2019-15753.