Bug 2061541 (CVE-2022-26495)

Summary:	CVE-2022-26495 nbd: heap-based buffer overflow in nbd-server.c
Product:	[Other] Security Response	Reporter:	Patrick Del Bello <pdelbell>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	enslaver, robinlee.sysu, xjakub
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-03-08 20:49:39 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:	2061886, 2061887
Bug Blocks:	2061543

Description Patrick Del Bello 2022-03-07 19:23:26 UTC

In nbd-server in nbd before 3.24, there is an integer overflow with a resultant heap-based buffer overflow. A value of 0xffffffff in the name length field will cause a zero-sized buffer to be allocated for the name, resulting in a write to a dangling pointer. This issue exists for the NBD_OPT_INFO, NBD_OPT_GO, and NBD_OPT_EXPORT_NAME messages.

https://sourceforge.net/projects/nbd/files/nbd/
https://lists.debian.org/nbd/2022/01/msg00037.html

Comment 1 Guilherme de Almeida Suckevicz 2022-03-08 16:56:14 UTC

Created nbd tracking bugs for this issue:

Affects: epel-7 [bug 2061886]
Affects: fedora-all [bug 2061887]

Comment 2 Product Security DevOps Team 2022-03-08 20:49:37 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.