Bug 1996929 (CVE-2021-39155)

Summary: CVE-2021-39155 istio/istio: HTTP request can bypass authorization mechanisms due to case insensitive host comparison
Product: [Other] Security Response Reporter: Mark Cooper <mcooper>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: jwendell, kconner, rcernich, security-response-team, twalsh
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: istio 1.11.1, istio 1.10.4, istio 1.9.8 Doc Type: If docs needed, set a value
Doc Text:
An authorization bypass vulnerability was found in istio/istio. The case insensitive host comparison incorrectly works when evaluating rules specified with `host` or `notHost`. This flaw allows an attacker to bypass an Istio authorization policy that uses hosts in the rules, potentially gaining access to the downstream services. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2021-08-25 15:34:58 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1996912    

Description Mark Cooper 2021-08-24 03:04:30 UTC 
Istio through 1.11.0 contains a vulnerability where the authorization mechanism can be bypassed when using rules that specify `host` or `notHost` due to a case insensitive host comparison.
Comment 2 errata-xmlrpc 2021-08-25 09:34:41 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh 1.1

Via RHSA-2021:3273 https://access.redhat.com/errata/RHSA-2021:3273
Comment 3 errata-xmlrpc 2021-08-25 09:35:27 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh 2.0

Via RHSA-2021:3272 https://access.redhat.com/errata/RHSA-2021:3272
Comment 4 Product Security DevOps Team 2021-08-25 15:34:58 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-2021-39155