Bug 1698020 (CVE-2019-9900) - CVE-2019-9900 istio/envoy: Authorization bypass via null characters injection in HTTP/1.x
Summary: CVE-2019-9900 istio/envoy: Authorization bypass via null characters injection...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-9900
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:
Depends On:
Blocks: 1698026
TreeView+ depends on / blocked
 
Reported: 2019-04-09 13:02 UTC by Pedro Sampaio
Modified: 2021-02-16 22:07 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in Envoy version 1.9.0 and older, where Envoy does not reject embedded zero characters (NUL, ASCII 0x0) when processing HTTP/1.x header values. This flaw allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.
Clone Of:
Environment:
Last Closed: 2020-03-13 04:31:43 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:0741 0 None None None 2019-04-10 20:29:13 UTC

Description Pedro Sampaio 2019-04-09 13:02:14 UTC 
A flaw was found in Envoy 1.9.0 and older. When parsing HTTP/1.x header values, Envoy does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.

Upstream issue:

https://github.com/envoyproxy/envoy/issues/6434

References:

https://istio.io/blog/2019/announcing-1.1.2/
Comment 1 Pedro Sampaio 2019-04-09 13:02:17 UTC 
Acknowledgments:

Name: the Envoy security team
Comment 3 errata-xmlrpc 2019-04-10 20:29:12 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh Tech Preview

Via RHSA-2019:0741 https://access.redhat.com/errata/RHSA-2019:0741
Comment 4 Product Security DevOps Team 2020-03-13 04:31:43 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-2019-9900
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