Multiple vulnerabilities in Openstack Neutron

Published: 2021-10-12

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-40085 CVE-2021-38598
CWE-ID	CWE-284 CWE-862
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	openstack-neutron Client/Desktop applications / Other client software
Vendor	Openstack

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper access control

EUVDB-ID: #VU57242

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-40085

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

openstack-neutron: 16.0.0 - 18.1.0

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Missing Authorization

EUVDB-ID: #VU57243

Risk: Low

CVSSv3.1: 4 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-38598

CWE-ID: CWE-862 - Missing Authorization

Exploit availability: No

Description

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.