Bug 2189106 (CVE-2021-46879)

Summary:	CVE-2021-46879 fluent-bit: heap overflow in flb_msgpack_gelf_value_ext
Product:	[Other] Security Response	Reporter:	Anten Skrabec <askrabec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	The package fluent-bit was found to be vulnerable to Heap-based Buffer Overflow due to a wrong variable being used to get msgpack data in the flb_msgpack_gelf_value_ext() function.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-04-24 13:16:09 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:	2189108, 2189109
Bug Blocks:	2186018

Description Anten Skrabec 2023-04-24 08:39:15 UTC

An issue was discovered in Treasure Data Fluent Bit 1.7.1, a wrong variable is used to get the msgpack data resulting in a heap overflow in flb_msgpack_gelf_value_ext. An attacker can craft a malicious file and tick the victim to open the file with the software, triggering a heap overflow and execute arbitrary code on the target system.

Comment 1 Anten Skrabec 2023-04-24 08:39:43 UTC

Created fluent-bit tracking bugs for this issue:

Affects: epel-8 [bug 2189109]
Affects: fedora-all [bug 2189108]

Comment 2 Product Security DevOps Team 2023-04-24 13:16:08 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.