Bug 2231221

Summary:	CVE-2023-33953 flatbuffers: gRPC: hpack table accounting errors can lead to denial of service [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Avinash Hanwate <ahanwate>
Component:	flatbuffers	Assignee:	Ben Beasley <code>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	38	CC:	code
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-08-11 14:46:43 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:	2230890

Description Avinash Hanwate 2023-08-11 04:56:25 UTC

More information about this security flaw is available in the following bug:

http://bugzilla.redhat.com/show_bug.cgi?id=2230890

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Comment 1 Avinash Hanwate 2023-08-11 04:56:28 UTC

Use the following template to for the 'fedpkg update' request to submit an
update for this issue as it contains the top-level parent bug(s) as well as
this tracking bug.  This will ensure that all associated bugs get updated
when new packages are pushed to stable.

=====

# bugfix, security, enhancement, newpackage (required)
type=security

# low, medium, high, urgent (required)
severity=high

# testing, stable
request=testing

# Bug numbers: 1234,9876
bugs=2230890,2231221

# Description of your update
notes=Security fix for [PUT CVEs HERE]

# Enable request automation based on the stable/unstable karma thresholds
autokarma=True
stable_karma=3
unstable_karma=-3

# Automatically close bugs when this marked as stable
close_bugs=True

# Suggest that users restart after update
suggest_reboot=False

======

Additionally, you may opt to use the bodhi web interface to submit updates:

https://bodhi.fedoraproject.org/updates/new

Comment 2 Ben Beasley 2023-08-11 14:46:43 UTC

This bug was correctly reported, since flatbuffers does bundle some grpc sources from a vulnerable version.

While I was not able to determine which specific grpc upstream changes fix this CVE, flatbuffers bundles only a few generator sources and headers from src/compiler/, and none of these contain hpack implementation code. Furthermore, only the build-time test executables link the system-wide grpc package.

Based on that analysis, I am satisfied that flatbuffers is unaffected by CVE-2023-32732.

Comment 3 Ben Beasley 2023-08-11 14:47:29 UTC

(In reply to Ben Beasley from comment #2)
> Based on that analysis, I am satisfied that flatbuffers is unaffected by
> CVE-2023-32732.

Sorry, my comment was partially copy-pasted from a previous bug. I am satisfied that flatbuffers is unaffected by CVE-2023-33953.