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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Flaw in CIFS CIFSSMBWrite() Lets Remote Users Deny Service
SecurityTracker Alert ID:  1024287
SecurityTracker URL:  http://securitytracker.com/id/1024287
CVE Reference:   CVE-2010-2248   (Links to External Site)
Date:  Aug 6 2010
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 4
Description:   A vulnerability was reported in the Linux Kernel. A remote user can cause denial of service conditions.

A remote server can send a specially crafted SMB packet in response to a connected client to trigger a flaw in the CIFSSMBWrite() function to trigger a kernel panic on the target system.

Impact:   A remote user can cause a kernel panic on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0606.html

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 6 2010 Linux Kernel Flaw in CIFS CIFSSMBWrite() Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2010:0606-01] Important: kernel security and bug fix update

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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2010:0606-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0606.html
Issue date:        2010-08-05
CVE Names:         CVE-2010-2248 CVE-2010-2521 
=====================================================================

1. Summary:

Updated kernel packages that fix multiple security issues and one bug are
now available for Red Hat Enterprise Linux 4.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, noarch, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, noarch, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, noarch, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, noarch, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

* a flaw was found in the CIFSSMBWrite() function in the Linux kernel
Common Internet File System (CIFS) implementation. A remote attacker could
send a specially-crafted SMB response packet to a target CIFS client,
resulting in a kernel panic (denial of service). (CVE-2010-2248, Important)

* buffer overflow flaws were found in the Linux kernel's implementation of
the server-side External Data Representation (XDR) for the Network File
System (NFS) version 4. An attacker on the local network could send a
specially-crafted large compound request to the NFSv4 server, which could
possibly result in a kernel panic (denial of service) or, potentially, code
execution. (CVE-2010-2521, Important)

This update also fixes the following bug:

* the rpc_call_async() function in the SUN Remote Procedure Call (RPC)
subsystem in the Linux kernel had a reference counting bug. In certain
situations, some Network Lock Manager (NLM) messages may have triggered
this bug on NFSv2 and NFSv3 servers, leading to a kernel panic (with
"kernel BUG at fs/lockd/host.c:[xxx]!" logged to "/var/log/messages").
(BZ#612962)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

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

To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

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

608583 - CVE-2010-2248 kernel: cifs: Fix a kernel BUG with remote OS/2 server
612028 - CVE-2010-2521 kernel: nfsd4: bug in read_buf
612962 - [4.4] The kernel BUG occurred with the message 'fs/lockd/host.c:252!' [rhel-4.8.z]

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/kernel-2.6.9-89.0.28.EL.src.rpm

i386:
kernel-2.6.9-89.0.28.EL.i686.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.i686.rpm
kernel-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.i686.rpm

ia64:
kernel-2.6.9-89.0.28.EL.ia64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.ia64.rpm
kernel-devel-2.6.9-89.0.28.EL.ia64.rpm
kernel-largesmp-2.6.9-89.0.28.EL.ia64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.ia64.rpm

noarch:
kernel-doc-2.6.9-89.0.28.EL.noarch.rpm

ppc:
kernel-2.6.9-89.0.28.EL.ppc64.rpm
kernel-2.6.9-89.0.28.EL.ppc64iseries.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.ppc64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.ppc64iseries.rpm
kernel-devel-2.6.9-89.0.28.EL.ppc64.rpm
kernel-devel-2.6.9-89.0.28.EL.ppc64iseries.rpm
kernel-largesmp-2.6.9-89.0.28.EL.ppc64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.ppc64.rpm

s390:
kernel-2.6.9-89.0.28.EL.s390.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.s390.rpm
kernel-devel-2.6.9-89.0.28.EL.s390.rpm

s390x:
kernel-2.6.9-89.0.28.EL.s390x.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.s390x.rpm
kernel-devel-2.6.9-89.0.28.EL.s390x.rpm

x86_64:
kernel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.x86_64.rpm
kernel-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/kernel-2.6.9-89.0.28.EL.src.rpm

i386:
kernel-2.6.9-89.0.28.EL.i686.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.i686.rpm
kernel-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.i686.rpm

noarch:
kernel-doc-2.6.9-89.0.28.EL.noarch.rpm

x86_64:
kernel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.x86_64.rpm
kernel-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/kernel-2.6.9-89.0.28.EL.src.rpm

i386:
kernel-2.6.9-89.0.28.EL.i686.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.i686.rpm
kernel-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.i686.rpm

ia64:
kernel-2.6.9-89.0.28.EL.ia64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.ia64.rpm
kernel-devel-2.6.9-89.0.28.EL.ia64.rpm
kernel-largesmp-2.6.9-89.0.28.EL.ia64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.ia64.rpm

noarch:
kernel-doc-2.6.9-89.0.28.EL.noarch.rpm

x86_64:
kernel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.x86_64.rpm
kernel-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/kernel-2.6.9-89.0.28.EL.src.rpm

i386:
kernel-2.6.9-89.0.28.EL.i686.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.i686.rpm
kernel-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-2.6.9-89.0.28.EL.i686.rpm
kernel-hugemem-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-2.6.9-89.0.28.EL.i686.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-2.6.9-89.0.28.EL.i686.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.i686.rpm

ia64:
kernel-2.6.9-89.0.28.EL.ia64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.ia64.rpm
kernel-devel-2.6.9-89.0.28.EL.ia64.rpm
kernel-largesmp-2.6.9-89.0.28.EL.ia64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.ia64.rpm

noarch:
kernel-doc-2.6.9-89.0.28.EL.noarch.rpm

x86_64:
kernel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-debuginfo-2.6.9-89.0.28.EL.x86_64.rpm
kernel-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-largesmp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-2.6.9-89.0.28.EL.x86_64.rpm
kernel-smp-devel-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-2.6.9-89.0.28.EL.x86_64.rpm
kernel-xenU-devel-2.6.9-89.0.28.EL.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-2010-2248.html
https://www.redhat.com/security/data/cve/CVE-2010-2521.html
http://www.redhat.com/security/updates/classification/#important

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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