CVE-2021-40085

Advisory

Neutron 16.4.1, 17.2.1 and 18.1.1 include a fix for CVE-2021-40085: An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.
https://www.openwall.com/lists/oss-security/2021/08/31/2

Affected package

Affected versions

Fixed versions

Vulnerability changelog

An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value. See CVE-2021-40085.


MISC:https://launchpad.net/bugs/1939733: https://launchpad.net/bugs/1939733
MISC:https://security.openstack.org/ossa/OSSA-2021-005.html: https://security.openstack.org/ossa/OSSA-2021-005.html
MLIST:[oss-security] 20210831 [OSSA-2021-005] Neutron: Arbitrary dnsmasq reconfiguration via extra_dhcp_opts (CVE-2021-40085): http://www.openwall.com/lists/oss-security/2021/08/31/2

Resources

• https://launchpad.net/bugs/1939733
• https://security.openstack.org/ossa/OSSA-2021-005.html
• http://www.openwall.com/lists/oss-security/2021/08/31/2
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40085
• https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html
• https://www.debian.org/security/2021/dsa-4983
• https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html