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CVE-2017-7543

MEDIUMCVSS 5.3/10EPSS 1.85%

Last modified

CVE-2017-7543 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. EPSS estimates a 1.85% chance of exploitation in the next 30 days.

Description

A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.

Metrics

CVSS 3.0
5.3/10

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Probability
1.85%

76.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
OpenstackNeutron>= 7.0.0, < 7.2.0-12.1
OpenstackNeutron>= 8.0.0, < 8.3.0-11.1
OpenstackNeutron>= 9.0.0, < 9.3.1-2.1
OpenstackNeutron>= 10.0.0, < 10.0.2-1.1
RedhatOpenstack6.0
RedhatOpenstack7.0
RedhatOpenstack8
RedhatOpenstack9
RedhatOpenstack10
RedhatOpenstack11

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2017-7543?
A race-condition flaw was discovered in openstack-neutron before 7.2.0-12.1, 8.x before 8.3.0-11.1, 9.x before 9.3.1-2.1, and 10.x before 10.0.2-1.1, where, following a minor overcloud update, neutron security groups were disabled. Specifically, the following were reset to 0: net.bridge.bridge-nf-call-ip6tables and net.bridge.bridge-nf-call-iptables. The race was only triggered by an update, at which point an attacker could access exposed tenant VMs and network resources.
How severe is CVE-2017-7543?
CVE-2017-7543 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.85% probability of exploitation in the next 30 days.
How do I fix CVE-2017-7543?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST