A system hardening measure could be bypassed.
Erik Olof Gunnar Andersson discovered that OpenStack Neutron incorrectly handled certain security group rules in the iptables firewall module. An authenticated attacker could possibly use this issue to block further application of security group rules for other instances.
25 June 2019
A security issue affects these releases of Ubuntu and its derivatives:
A system hardening measure could be bypassed.
Erik Olof Gunnar Andersson discovered that OpenStack Neutron incorrectly handled certain security group rules in the iptables firewall module. An authenticated attacker could possibly use this issue to block further application of security group rules for other instances.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.
Vulmon