Bug 1942280 (CVE-2021-29258) - CVE-2021-29258 envoyproxy/envoy: crash with empty HTTP/2 metadata map
Summary: CVE-2021-29258 envoyproxy/envoy: crash with empty HTTP/2 metadata map
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-29258
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: Embargoed1941991
TreeView+ depends on / blocked
 
Reported: 2021-03-24 03:35 UTC by Mark Cooper
Modified: 2021-04-22 10:47 UTC (History)
4 users (show)

Fixed In Version: envoyproxy/envoy 1.17.2
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in envoyproxy. An attacker, able to craft an HTTP2 request that specifies an empty metadata map, can crash envoy resulting in a denial of service due to the null reference. The highest threat from this vulnerability is to system availability.
Clone Of:
Environment:
Last Closed: 2021-04-22 10:47:02 UTC

Attachments (Terms of Use)

Description Mark Cooper 2021-03-24 03:35:32 UTC 
A null reference vulnerability was found in all versions of Envoy up to 1.17.2. If an attacker can craft a HTTP2 request that specifies an empty metadata map[1], then envoy will attempt to process this and crash, resulting in a denial of service.

[1] - https://github.com/envoyproxy/envoy/blob/main/source/docs/h2_metadata.md
Comment 1 Mark Cooper 2021-03-24 03:35:38 UTC 
Acknowledgments:

Name: the Envoy security team
Comment 7 Mark Cooper 2021-04-16 03:00:50 UTC 
External References:

https://istio.io/latest/news/security/istio-security-2021-003/
https://github.com/envoyproxy/envoy/blob/main/source/docs/h2_metadata.md
Comment 8 errata-xmlrpc 2021-04-22 08:58:45 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh 2.0

Via RHSA-2021:1324 https://access.redhat.com/errata/RHSA-2021:1324
Comment 9 errata-xmlrpc 2021-04-22 09:01:31 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh 1.1

Via RHSA-2021:1322 https://access.redhat.com/errata/RHSA-2021:1322
Comment 10 Product Security DevOps Team 2021-04-22 10:47:02 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-2021-29258
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