Bug 1959481 (CVE-2021-31920) - CVE-2021-31920 istio/istio: HTTP request with escaped slash characters can bypass authorization mechanisms
Summary: CVE-2021-31920 istio/istio: HTTP request with escaped slash characters can by...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-31920
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:
: 1921525 (view as bug list)
Depends On:
Blocks: 1921524 1951189
TreeView+ depends on / blocked
 
Reported: 2021-05-11 15:49 UTC by Mark Cooper
Modified: 2023-09-01 00:07 UTC (History)
7 users (show)

Fixed In Version: istio 1.9.5, istio 1.8.6
Doc Type: If docs needed, set a value
Doc Text:
An authorization bypass flaw was found in Istio. This flaw allows an attacker to craft an HTTP request that defines a certain pattern of escaped characters in the URI path (such as %2F, %2f, %5C, or %5c), allowing them to bypass the authorization service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2021-05-13 08:34:02 UTC
Embargoed:

Attachments (Terms of Use)

Description Mark Cooper 2021-05-11 15:49:38 UTC 
Istio through 1.9.5 contains a remotely exploitable vulnerability where an HTTP request with escaped slash characters can bypass authorization mechanisms. A subset of this security issue was addressed in the Envoy proxy, CVE-2021-29492.
Comment 3 Mark Cooper 2021-05-11 16:21:37 UTC 
Statement:

This CVE addresses the specific fixes required in istio to support the vulnerability found in envoyproxy/envoy, CVE-2021-29492.
Comment 5 errata-xmlrpc 2021-05-11 23:28:40 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh 2.0

Via RHSA-2021:1538 https://access.redhat.com/errata/RHSA-2021:1538
Comment 6 errata-xmlrpc 2021-05-11 23:29:27 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh 1.1

Via RHSA-2021:1540 https://access.redhat.com/errata/RHSA-2021:1540
Comment 7 Mark Cooper 2021-05-12 01:23:16 UTC 
External References:

https://istio.io/latest/news/security/istio-security-2021-005/
Comment 8 Mark Cooper 2021-05-13 03:57:50 UTC 
Acknowledgments:

Name: the Istio Product Security Working Group
Comment 9 Product Security DevOps Team 2021-05-13 08:34:02 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-2021-31920
Comment 10 Mark Cooper 2021-06-23 00:20:26 UTC 
*** Bug 1921525 has been marked as a duplicate of this bug. ***
Note You need to log in before you can comment on or make changes to this bug.