Bug 2013080 (CVE-2021-3671)

Summary:	CVE-2021-3671 samba: Null pointer dereference on missing sname in TGS-REQ
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abokovoy, anoopcs, asn, dkarpele, gdeschner, hvyas, iboukris, jarrpa, jstephen, lmohanty, madam, puebele, rhs-smb, sbose, ssorce
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	samba 4.13.12, samba 4.14.8	Doc Type:	If docs needed, set a value
Doc Text:	A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-12 08:03:29 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:	2013081
Bug Blocks:	1988195, 2013082

Description Huzaifa S. Sidhpurwala 2021-10-12 04:04:58 UTC

Samba's use of Heimdal was vulnerable to a null pointer de-reference flaw due to missing sname in TGS-REQ. 

This is already fixed in upstream Heimdal via:
https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a

Comment 1 Huzaifa S. Sidhpurwala 2021-10-12 04:05:51 UTC

Created samba tracking bugs for this issue:

Affects: fedora-all [bug 2013081]