Resource exhaustion in OpenStack Os-Vif
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.026 (84.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000
Affected products
- OpenStack Os-Vif — versions 1.16.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- launchpad.net/bugs/1837252 (Third Party Advisory, Issue Tracking)
- review.opendev.org/672834 (Patch)
- review.opendev.org/678098 (Patch)
- security.openstack.org/ossa/OSSA-2019-004.html (Patch, Vendor Advisory)
- www.openwall.com/lists/oss-security/2019/08/29/2 (mailing-list, Patch, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-15753?
- CVE-2019-15753 is a critical-severity vulnerability in OpenStack Os-Vif, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 9.1/10. Published 2019-08-28.
- How severe is CVE-2019-15753?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2019-15753 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.