Bug 2284255 (CVE-2024-36844)

Summary:	CVE-2024-36844 libmodbus: use after free
Product:	[Other] Security Response	Reporter:	ybuenos
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	esandeen
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2024-07-17 16:35:17 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2284257, 2284258
Bug Blocks:

Description ybuenos 2024-06-02 14:15:06 UTC

libmodbus v3.1.6 was discovered to contain a use-after-free via the ctx->backend pointer. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted message sent to the unit-test-server.

https://github.com/stephane/libmodbus/issues/749

Comment 1 ybuenos 2024-06-02 14:15:54 UTC

Created libmodbus tracking bugs for this issue:

Affects: epel-all [bug 2284257]
Affects: fedora-all [bug 2284258]

Comment 2 Eric Sandeen 2024-07-17 16:35:17 UTC

This is yet another duplicate of CVE-2024-36843, see discussion in https://github.com/stephane/libmodbus/issues/750 and https://github.com/stephane/libmodbus/issues/749

The flaw is fixed in version 3.1.7 which is already present in all supported distributions, so closing NOTABUG.