Bug 1802381 (CVE-2020-1741) - CVE-2020-1741 openshift-ansible: cors allowed origin allows changing url protocol
Summary: CVE-2020-1741 openshift-ansible: cors allowed origin allows changing url prot...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-1741
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: 1804302 1802394
Blocks: 1797390
TreeView+ depends on / blocked
 
Reported: 2020-02-13 03:39 UTC by Jason Shepherd
Modified: 2023-12-15 17:19 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in openshift-ansible. OpenShift Container Platform (OCP) 3.11 is too permissive in the way it specified CORS allowed origins during installation. An attacker, able to man-in-the-middle the connection between the user's browser and the openshift console, could use this flaw to perform a phishing attack. The main threat from this vulnerability is data confidentiality.
Clone Of:
Environment:
Last Closed: 2020-08-27 13:17:31 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:3541 0 None None None 2020-08-26 22:46:56 UTC

Description Jason Shepherd 2020-02-13 03:39:09 UTC 
OpenShift Container Platform (OCP) 3.11 was too permissive in the way it specified CORS allowed origins during installation. An attacker able to man-in-the-middle the connection between the user's browser and the openshift console could use this flaw to perform a phishing attack.
Comment 3 Jason Shepherd 2020-02-13 04:06:54 UTC 
Mitigation:

Ensure that the corsAllowedOrigin definition within master-config.yaml contains elements in the form 

~~~
corsAllowedOrigins:
- ^(?i)https://my\.subdomain\.domain\.com(:|\z)
~~~

and not the form

~~~
corsAllowedOrigins:
- (?i)//my\.subdomain\.domain\.com(:|\z)
~~~

as the first will permit cross origin requests only if the host and protocol matches, whereas the second will permit a downgrade to http protocol for example.
Comment 8 Jason Shepherd 2020-03-16 06:22:18 UTC 
Filed a bug to get the documentation updated:

https://bugzilla.redhat.com/show_bug.cgi?id=1813799
Comment 9 errata-xmlrpc 2020-08-26 22:46:53 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 3.11

Via RHSA-2020:3541 https://access.redhat.com/errata/RHSA-2020:3541
Comment 10 Product Security DevOps Team 2020-08-27 13:17:31 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-2020-1741
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