Bug 2241041 (CVE-2023-5215)

Summary:	CVE-2023-5215 libnbd: Crash or misbehaviour when NBD server returns an unexpected block size
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mxie, rjones, tyan, tzheng, virt-maint, vwu, xiaodwan
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libnbd 1.18.0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2241042, 2241043, 2241044
Bug Blocks:	2240178, 2241096

Description Pedro Sampaio 2023-09-27 19:49:50 UTC

In libnbd since v1.0 a server can reply with a block size larger than 2^63 (the NBD spec states size is a 64-bit unsigned value) possibly leading to application crash or other unintended behavior for NBD clients that doesn't treat the return value correctly.

References:

https://listman.redhat.com/archives/libguestfs/2023-September/032635.html

Comment 1 Pedro Sampaio 2023-09-27 19:52:29 UTC

Created libnbd tracking bugs for this issue:

Affects: fedora-all [bug 2241042]

Comment 6 errata-xmlrpc 2024-04-30 09:47:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:2204 https://access.redhat.com/errata/RHSA-2024:2204