Bug 1598831 (CVE-2018-10896) - CVE-2018-10896 cloud-init: default configuration disabled deletion of SSH host keys
Summary: CVE-2018-10896 cloud-init: default configuration disabled deletion of SSH hos...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-10896
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1574338 1598832 1598833 1598834 1814152 1826218 1855595
Blocks: 1576571
TreeView+ depends on / blocked
 
Reported: 2018-07-06 15:04 UTC by Laura Pardo
Modified: 2021-02-17 00:00 UTC (History)
10 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
The default cloud-init configuration included "ssh_deletekeys: 0", disabling cloud-init's deletion of ssh host keys. In some environments, this could lead to instances created by cloning a golden master or template system, sharing ssh host keys, and being able to impersonate one another or conduct man-in-the-middle attacks.
Clone Of:
Environment:
Last Closed: 2020-07-21 19:27:38 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:3050 0 None None None 2020-07-21 15:30:43 UTC
Red Hat Product Errata RHSA-2020:3644 0 None None None 2020-09-08 07:56:20 UTC
Red Hat Product Errata RHSA-2020:3898 0 None None None 2020-09-29 19:40:43 UTC

Description Laura Pardo 2018-07-06 15:04:16 UTC 
A flaw was found in cloud-init. SSH host keys are not regenerated when new VM instances are created in combination with hashicorp packer and cloud-init. This could lead to the Man In The Middle (MITM) attack.


References:
https://bugzilla.redhat.com/show_bug.cgi?id=1574338
Comment 1 Laura Pardo 2018-07-06 15:05:49 UTC 
Created cloud-init tracking bugs for this issue:

Affects: epel-6 [bug 1598833]
Affects: fedora-all [bug 1598832]
Comment 5 Doran Moppert 2018-07-11 00:32:13 UTC 
Reported upstream:

https://bugs.launchpad.net/cloud-init/+bug/1781094
Comment 7 Doran Moppert 2018-08-07 00:59:01 UTC 
Upstream commit now merged to master:

https://git.launchpad.net/cloud-init/commit/?id=e218c597
Comment 8 errata-xmlrpc 2020-07-21 15:30:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:3050 https://access.redhat.com/errata/RHSA-2020:3050
Comment 9 Product Security DevOps Team 2020-07-21 19:27:38 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-2018-10896
Comment 11 errata-xmlrpc 2020-09-08 07:56:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2020:3644 https://access.redhat.com/errata/RHSA-2020:3644
Comment 12 errata-xmlrpc 2020-09-29 19:40:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3898 https://access.redhat.com/errata/RHSA-2020:3898
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