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

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

Keywords:
Status:	ASSIGNED
Alias:	CVE-2009-1072
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Nobody
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:	499072 499073 499074 499075 499076
Blocks:
TreeView+	depends on / blocked

Reported:	2009-03-23 04:15 UTC by Eugene Teo (Security Response)
Modified:	2023-07-07 08:31 UTC (History)
CC List:	7 users (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:	2009-03-27 07:02:51 UTC
Embargoed:

Attachments	(Terms of Use)
Upstream patch (1.55 KB, patch) 2009-03-23 04:18 UTC, Eugene Teo (Security Response)	no flags	Details \| Diff
View All

Links
System	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 15:36:49 UTC
Red Hat Product Errata	RHSA-2009:1106	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2009-06-16 22:34:13 UTC
Red Hat Product Errata	RHSA-2009:1132	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2009-06-30 08:06:02 UTC

Description Eugene Teo (Security Response) 2009-03-23 04:15:43 UTC

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 04:18:13 UTC

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 15:37:08 UTC

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 22:34:37 UTC

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 08:06:28 UTC

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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