Bug 1998052 (CVE-2021-40085) - CVE-2021-40085 openstack-neutron: arbitrary dnsmasq reconfiguration via extra_dhcp_opts
Summary: CVE-2021-40085 openstack-neutron: arbitrary dnsmasq reconfiguration via extra...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-40085
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
: 1997808 (view as bug list)
Depends On: 1999832 1999919 1999920 2000015 2000785
Blocks: 1998050
TreeView+ depends on / blocked
 
Reported: 2021-08-26 11:08 UTC by Dhananjay Arunesh
Modified: 2021-09-15 06:39 UTC (History)
26 users (show)

Fixed In Version: neutron 16.4.1, neutron 17.2.1, neutron 18.1.1
Doc Type: If docs needed, set a value
Doc Text:
An input-validation flaw was found in openstack-neutron, where an authenticated attacker could change the dnsmasq configuration. By crafting extra_dhcp_opts values, the attacker could crash the dnsmasq, change parameters for tenants sharing the same interface, or otherwise alter that daemon’s behavior. This flaw might also be used to trigger a configuration parsing buffer overflow in versions of dnsmasq prior to 2.81. The highest threat from this vulnerability is to system availability, but also threatens data confidentiality and integrity.
Clone Of:
Environment:
Last Closed: 2021-09-10 00:21:09 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:3481 0 None None None 2021-09-09 14:04:11 UTC
Red Hat Product Errata RHSA-2021:3488 0 None None None 2021-09-15 06:39:10 UTC
Red Hat Product Errata RHSA-2021:3502 0 None None None 2021-09-13 10:25:07 UTC
Red Hat Product Errata RHSA-2021:3503 0 None None None 2021-09-13 10:36:10 UTC

Description Dhananjay Arunesh 2021-08-26 11:08:35 UTC 
By supplying a specially crafted extra_dhcp_opts value, an authenticated user may add arbitrary configuration to the dnsmasq process in order to crash the service, change parameters for other tenants sharing the same interface, or otherwise alter that daemon's behavior. Thi vulnerability may also be used to trigger a configuration parsing buffer overflow in versions of dnsmasq prior to 2.81, which could lead to remote code execution. All Neutron deployments are affected.

References:
https://launchpad.net/bugs/1939733
Comment 1 Guilherme de Almeida Suckevicz 2021-08-31 19:00:06 UTC 
Created openstack-neutron tracking bugs for this issue:

Affects: openstack-rdo [bug 1999832]
Comment 2 Summer Long 2021-09-01 01:21:55 UTC 
*** Bug 1997808 has been marked as a duplicate of this bug. ***
Comment 3 Summer Long 2021-09-01 01:35:34 UTC 
Upstream patches:
    https://review.opendev.org/806750 (Ussuri)
    https://review.opendev.org/806749 (Victoria)
    https://review.opendev.org/806748 (Wallaby)
    https://review.opendev.org/806746 (Xena)
Comment 14 errata-xmlrpc 2021-09-09 14:04:09 UTC 
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 16.1

Via RHSA-2021:3481 https://access.redhat.com/errata/RHSA-2021:3481
Comment 15 Product Security DevOps Team 2021-09-10 00:21:09 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-40085
Comment 16 errata-xmlrpc 2021-09-13 10:25:04 UTC 
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 10.0 (Newton)

Via RHSA-2021:3502 https://access.redhat.com/errata/RHSA-2021:3502
Comment 17 errata-xmlrpc 2021-09-13 10:36:08 UTC 
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 13.0 - ELS
  Red Hat OpenStack Platform 13.0 (Queens) for RHEL 7.6 EUS

Via RHSA-2021:3503 https://access.redhat.com/errata/RHSA-2021:3503
Comment 18 errata-xmlrpc 2021-09-15 06:39:09 UTC 
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 16.2

Via RHSA-2021:3488 https://access.redhat.com/errata/RHSA-2021:3488
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