Bug 1225826 (CVE-2024-36843)

Summary:	VUL-0: CVE-2024-36843: libmodbus: heap overflow via the modbus_mapping_free() function
Product:	[openSUSE] openSUSE Distribution	Reporter:	SMASH SMASH <smash_bz>
Component:	Security	Assignee:	Stanislav Brabec <sbrabec>
Status:	CONFIRMED ---	QA Contact:	Security Team bot <security-team>
Severity:	Major
Priority:	P3 - Medium	CC:	camila.matos
Version:	Leap 15.6
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/408370/
Whiteboard:	CVSSv3.1:SUSE:CVE-2024-36843:8.2:(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-06-03 11:31:27 UTC

libmodbus v3.1.6 was discovered to contain a heap overflow via the modbus_mapping_free() function.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36843
https://www.cve.org/CVERecord?id=CVE-2024-36843
https://github.com/stephane/libmodbus/issues/748
https://bugzilla.redhat.com/show_bug.cgi?id=2284252

Comment 2 Stanislav Brabec 2024-06-11 18:03:16 UTC

Checking the upstream, there is no fix. The upstream issue has no progress. Redhat Bugzilla has no progress yet.

It looks either like a double free() or a memory corruption that could be possibly found by valgring.

Is it serious enough to start a research? Note that we have no Modbus testing hardware.