Bug 1907804 (CVE-2020-35471) - CVE-2020-35471 envoy: mishandling dropped and truncated datagrams leads to segfault and DoS
Summary: CVE-2020-35471 envoy: mishandling dropped and truncated datagrams leads to se...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-35471
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: 1907809
TreeView+ depends on / blocked
 
Reported: 2020-12-15 09:45 UTC by Marian Rehak
Modified: 2023-08-30 23:50 UTC (History)
4 users (show)

Fixed In Version: envoy 1.16.1
Clone Of:
Environment:
Last Closed: 2020-12-16 04:18:20 UTC
Embargoed:

Attachments (Terms of Use)

Description Marian Rehak 2020-12-15 09:45:12 UTC 
Envoy before 1.16.1 mishandles dropped and truncated datagrams, as demonstrated by a segmentation fault for a UDP packet size larger than 1500.

Upstream Issue:

https://github.com/envoyproxy/envoy/issues/14113
Comment 1 Product Security DevOps Team 2020-12-16 04:18:20 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-2020-35471
Comment 3 Mark Cooper 2020-12-17 04:35:59 UTC 
OpenShift ServiceMesh (Istio upstream) does not implement the UDP proxy in Envoy. 

Ref: https://istio.io/latest/docs/ops/configuration/traffic-management/protocol-selection/

However it does still ship the affected code so have marked low and wontfix as the code is unreachable.
Comment 5 Mark Cooper 2020-12-17 06:05:47 UTC 
Upstream fix: https://github.com/envoyproxy/envoy/pull/14122/files
Comment 6 Mark Cooper 2020-12-17 07:08:50 UTC 
Can also be confirmed when attempting to create a virtualservice for proxying traffic in istio, one will get the error:

Error from server: error when creating "test-gateway.yaml": admission webhook "validation.istio.io" denied the request: configuration is invalid: http, tcp or tls must be provided in virtual service
Comment 8 RaTasha Tillery-Smith 2021-01-04 14:14:45 UTC 
Statement:

While OpenShift ServiceMesh (OSSM) does package a vulnerable version of Envoy, it does not implement the UDP proxy in Envoy. Therefore, it has been assessed with a Low impact, Wontfix, and may be addressed in a future release.
Note You need to log in before you can comment on or make changes to this bug.