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Category:   OS (Linux)  >   Red Hat Global File System Vendors:   Red Hat
(Red Hat Issues Fix for gfs-kmod) Red Hat Global File System gfs_lock() Lets Local Users Deny Service
SecurityTracker Alert ID:  1024178
SecurityTracker URL:  http://securitytracker.com/id/1024178
CVE Reference:   CVE-2010-0727   (Links to External Site)
Date:  Jul 8 2010
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5.4.z
Description:   A vulnerability was reported in Red Hat Global File System. A local user can cause denial of service conditions.

On a system that has a Global File System (GFS) mounted, a local user can exploit a flaw in the gfs_lock() implementation to trigger a kernel panic.

Impact:   A local user can cause a kernel panic on the target system.
Solution:   Red Hat has issued a fix for gfs-kmod on RHEL Cluster-Storage.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0521.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2010-0330.html (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Apr 1 2010 Red Hat Global File System gfs_lock() Lets Local Users Deny Service



 Source Message Contents

Subject:  [RHSA-2010:0521-01] Moderate: gfs-kmod security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: gfs-kmod security update
Advisory ID:       RHSA-2010:0521-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0521.html
Issue date:        2010-07-08
CVE Names:         CVE-2010-0727 
=====================================================================

1. Summary:

Updated gfs-kmod packages that fix one security issue are now available for
Red Hat Enterprise Linux 5.4 Extended Update Support, kernel release
2.6.18-164.19.1.el5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

RHEL Cluster-Storage (v. 5.4.Z server) - i386, ia64, ppc, x86_64

3. Description:

The gfs-kmod packages contain modules that provide the ability to mount and
use GFS file systems.

A flaw was found in the gfs_lock() implementation. The GFS locking code
could skip the lock operation for files that have the S_ISGID bit
(set-group-ID on execution) in their mode set. A local, unprivileged user
on a system that has a GFS file system mounted could use this flaw to cause
a kernel panic. (CVE-2010-0727)

These updated gfs-kmod packages are in sync with the latest kernel
(2.6.18-164.19.1.el5). The modules in earlier gfs-kmod packages failed to
load because they did not match the running kernel. It was possible to
force-load the modules. With this update, however, users no longer need to.

Users are advised to upgrade to these latest gfs-kmod packages, updated for
use with the 2.6.18-164.19.1.el5 kernel, which contain a backported patch
to correct this issue.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

570863 - CVE-2010-0727 bug in GFS/GFS2 locking code leads to dos

6. Package List:

RHEL Cluster-Storage (v. 5.4.Z server):

Source:
gfs-kmod-0.1.34-2.el5_4.3.src.rpm

i386:
gfs-kmod-debuginfo-0.1.34-2.el5_4.3.i686.rpm
kmod-gfs-0.1.34-2.el5_4.3.i686.rpm
kmod-gfs-PAE-0.1.34-2.el5_4.3.i686.rpm
kmod-gfs-xen-0.1.34-2.el5_4.3.i686.rpm

ia64:
gfs-kmod-debuginfo-0.1.34-2.el5_4.3.ia64.rpm
kmod-gfs-0.1.34-2.el5_4.3.ia64.rpm
kmod-gfs-xen-0.1.34-2.el5_4.3.ia64.rpm

ppc:
gfs-kmod-debuginfo-0.1.34-2.el5_4.3.ppc64.rpm
kmod-gfs-0.1.34-2.el5_4.3.ppc64.rpm

x86_64:
gfs-kmod-debuginfo-0.1.34-2.el5_4.3.x86_64.rpm
kmod-gfs-0.1.34-2.el5_4.3.x86_64.rpm
kmod-gfs-xen-0.1.34-2.el5_4.3.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2010-0727.html
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2010 Red Hat, Inc.
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