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.
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
| Link | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543 | issue tracking third party advisory mitigation |
| https://access.redhat.com/errata/RHSA-2017:2447 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2451 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2450 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2448 | third party advisory vendor advisory |
| http://www.securityfocus.com/bid/100237 | vdb entry third party advisory |
| https://access.redhat.com/errata/RHSA-2017:2452 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2449 | third party advisory vendor advisory |