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Red Hat Enterprise 5.4 RHSA-2010:0521 Moderate Gfs-Kmod Locking Flaw

red hat
Calendar Grey July 8, 2010
Dist Redhat Esm H88
A minor security patch for gfs-kmod components corrects a synchronization vulnerability in Red Hat Enterprise Linux 5.4.
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

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

Summary

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.

Topics%20covered

Topics Covered

security advisory security issue kernel update moderate impact Red Hat Enterprise gfs-kmod locking flaw

References

https://access.redhat.com/security/cve/CVE-2010-0727 https://access.redhat.com/security/updates/classification#moderate

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://access.redhat.com/security/team/key#package


Advisory ID: RHSA-2010:0521-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2010:0521.html
Issue date: 2010-07-08

Topic

Updated gfs-kmod packages that fix one security issue are now available forRed Hat Enterprise Linux 5.4 Extended Update Support, kernel release2.6.18-164.19.1.el5.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory security issue kernel update moderate impact Red Hat Enterprise gfs-kmod locking flaw

Relevant Releases Architectures

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

Bugs Fixed

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

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