Bug 491572 – CVE-2009-1072 kernel: nfsd should drop CAP_MKNOD for non-root

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Bug 491572 - (CVE-2009-1072) CVE-2009-1072 kernel: nfsd should drop CAP_MKNOD for non-root

Summary:	CVE-2009-1072 kernel: nfsd should drop CAP_MKNOD for non-root

Status:	ASSIGNED

Aliases:	CVE-2009-1072

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	public=20090319,source=lkml,reported=...
Keywords:	Reopened, Security

Depends On:	499072 499073 499074 499075 499076
Blocks:
	Show dependency tree / graph

Reported:	2009-03-23 00:15 EDT by Eugene Teo (Security Response)
Modified:	2018-08-28 17:48 EDT (History)
CC List:	10 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2009-03-27 03:02:51 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Upstream patch (1.55 KB, patch) 2009-03-23 00:18 EDT, Eugene Teo (Security Response)	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2009:1081	normal	SHIPPED_LIVE	Important: kernel-rt security and bug fix update	2009-06-03 11:36:49 EDT
Red Hat Product Errata	RHSA-2009:1106	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2009-06-16 18:34:13 EDT
Red Hat Product Errata	RHSA-2009:1132	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2009-06-30 04:06:02 EDT

Groups: None (edit)

Description Eugene Teo (Security Response) 2009-03-23 00:15:43 EDT

Description of problem:
Since creating a device node is normally an operation requiring special privilege, Igor Zhbanov points out that it is surprising (to say the least) that a client can, for example, create a device node on a filesystem exported with root_squash.

So, make sure CAP_MKNOD is among the capabilities dropped when an nfsd thread handles a request from a non-root user.

References:
http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/665b99fdc970bee3
http://article.gmane.org/gmane.comp.security.oss.general/1581

Comment 1 Eugene Teo (Security Response) 2009-03-23 00:18:13 EDT

Created attachment 336238 [details]
Upstream patch

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=76a67ec6fb79ff3570dcb5342142c16098299911

Comment 11 errata-xmlrpc 2009-06-03 11:37:08 EDT

This issue has been addressed in following products:

  MRG for RHEL-5

Via RHSA-2009:1081 https://rhn.redhat.com/errata/RHSA-2009-1081.html

Comment 12 errata-xmlrpc 2009-06-16 18:34:37 EDT

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2009:1106 https://rhn.redhat.com/errata/RHSA-2009-1106.html

Comment 13 errata-xmlrpc 2009-06-30 04:06:28 EDT

This issue has been addressed in following products:

  Red Hat Enterprise Linux 4

Via RHSA-2009:1132 https://rhn.redhat.com/errata/RHSA-2009-1132.html

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