Bug 755440 (CVE-2011-4324)

Summary:	CVE-2011-4324 kernel: nfsv4: mknod(2) DoS
Product:	[Other] Security Response	Reporter:	Eugene Teo (Security Response) <eteo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, anton, arozansk, bhu, dhoward, fhrbata, hui.zhu, jkacur, kernel-mgr, lgoncalv, lwang, plougher, pmatouse, rt-maint, rwheeler, security-response-team, sforsber, vgoyal, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-05-04 07:58:24 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:	754901, 755442, 782690
Bug Blocks:	755438

Description Eugene Teo (Security Response) 2011-11-21 06:50:02 UTC

Creating a file with mknod(2) syscall on a nfsv4 mount can trigger BUG().

Comment 2 Eugene Teo (Security Response) 2011-11-21 06:55:52 UTC

Eryu Guan 2011-11-18 02:16:30 EST

Upstream commit

commit dc0b027dfadfcb8a5504f7d8052754bf8d501ab9
Author: Trond Myklebust <Trond.Myklebust>
Date:   Tue Dec 23 15:21:56 2008 -0500

    NFSv4: Convert the open and close ops to use fmode

    Signed-off-by: Trond Myklebust <Trond.Myklebust>

removed the BUGON() at fs/nfs/nfs4xdr.c:894

Comment 4 Eugene Teo (Security Response) 2011-11-21 06:58:22 UTC

Statement:

This issue did not affect the Linux kernels as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as they did not have the vulnerable code as introduced in history:1a7bc914. This has been addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2012-0007.html. Red Hat Enterprise Linux 4 is now in Production 3 of the maintenance life-cycle, https://access.redhat.com/support/policy/updates/errata/, therefore the fix for this issue is not currently planned to be included in the future updates.

Comment 5 errata-xmlrpc 2012-01-10 20:09:47 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:0007 https://rhn.redhat.com/errata/RHSA-2012-0007.html

Comment 6 Eugene Teo (Security Response) 2012-01-18 07:16:09 UTC

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 782690]