CVE-2017-7543: Race Condition
First published: Fri Jul 21 2017(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| OpenStack Neutron | >=7.0.0<7.2.0-12.1 | |
| OpenStack Neutron | >=8.0.0<8.3.0-11.1 | |
| OpenStack Neutron | >=9.0.0<9.3.1-2.1 | |
| OpenStack Neutron | >=10.0.0<10.0.2-1.1 | |
| Red Hat OpenStack for IBM Power | =6.0 | |
| Red Hat Enterprise Linux | =7.0 | |
| Red Hat OpenStack for IBM Power | =7.0 | |
| Red Hat OpenStack for IBM Power | =8 | |
| Red Hat OpenStack for IBM Power | =9 | |
| Red Hat OpenStack for IBM Power | =10 | |
| Red Hat OpenStack for IBM Power | =11 |
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Reference Links
- https://access.redhat.com/errata/RHSA-2017:2451
- https://access.redhat.com/errata/RHSA-2017:2450
- https://access.redhat.com/errata/RHSA-2017:2449
- https://access.redhat.com/errata/RHSA-2017:2448
- https://access.redhat.com/errata/RHSA-2017:2447
- https://access.redhat.com/errata/RHSA-2017:2452
- https://access.redhat.com/security/cve/CVE-2017-7543
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1491473
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1491473&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1491474
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1491474&action=edit
- https://bugzilla.redhat.com/show_bug.cgi?id=1473792
- http://www.securityfocus.com/bid/100237
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7543
Frequently Asked Questions
What is the severity of CVE-2017-7543?
CVE-2017-7543 is classified as a moderate severity vulnerability due to the risk of neutron security groups being disabled after an overcloud update.
How do I fix CVE-2017-7543?
To fix CVE-2017-7543, you should upgrade OpenStack Neutron to versions 7.2.0-12.1, 8.3.0-11.1, 9.3.1-2.1, or 10.0.2-1.1 or later.
Who is affected by CVE-2017-7543?
CVE-2017-7543 affects users of OpenStack Neutron versions prior to 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.
What specific issue does CVE-2017-7543 cause?
CVE-2017-7543 causes a race-condition flaw that can disable neutron security groups after a minor overcloud update.
Is there a workaround for CVE-2017-7543?
There are no specific workarounds for CVE-2017-7543; upgrading to a fixed version is the recommended course of action.
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