CVE-2019-15753

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.

Category

9.1
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.97% Top 25%
Vendor Advisory openstack.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://launchpad.net/bugs/1837252 issue tracking third party advisory
https://review.opendev.org/672834 patch
https://review.opendev.org/678098 patch
https://security.openstack.org/ossa/OSSA-2019-004.html patch vendor advisory
http://www.openwall.com/lists/oss-security/2019/08/29/2 mailing list third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2019-15753?
CVE-2019-15753 has been scored as a critical severity vulnerability.
How to fix CVE-2019-15753?
To fix CVE-2019-15753, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-15753 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2019-15753 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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