SB2021101209 - Multiple vulnerabilities in Openstack Neutron

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper access control (CVE-ID: CVE-2021-40085)

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote user can bypass implemented security restrictions and reconfigure dnsmasq via a crafted extra_dhcp_opts value.

2) Missing Authorization (CVE-ID: CVE-2021-38598)

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to missing authorization when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. A remote attacker in control of a server instance connected to the virtual switch can send specially crafted packets to impersonate the hardware addresses of other systems on the network.

Remediation

Install update from vendor's website.

References

• https://security.openstack.org/ossa/OSSA-2021-005.html
• https://launchpad.net/bugs/1939733
• http://www.openwall.com/lists/oss-security/2021/08/31/2
• https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html
• https://www.debian.org/security/2021/dsa-4983
• https://launchpad.net/bugs/1938670