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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel NFS Server-Side XDR Buffer Overflow May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1024747
SecurityTracker URL:  http://securitytracker.com/id/1024747
CVE Reference:   CVE-2010-2521   (Links to External Site)
Date:  Nov 16 2010
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5.3.z
Description:   A vulnerability was reported in the Linux Kernel. A remote user on the local network may be able to execute arbitrary code on the target system.

A remote user on the local network can send a specially crafted large compound request to the target NFSv4 server to trigger a buffer overflow and potentially execute arbitrary code on the target system. The code will run with the privileges of the target service.

Impact:   A remote user on the local network may be able to execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0893.html

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

Message History:   This archive entry is a follow-up to the message listed below.
Aug 6 2010 Linux Kernel NFS Server-Side XDR Buffer Overflow May Let Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2010:0893-01] 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-2010:0893-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0893.html
Issue date:        2010-11-16
CVE Names:         CVE-2010-2521 
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and three bugs are now
available for Red Hat Enterprise Linux 5.3 Extended Update Support.

The Red Hat Security Response Team has rated this update as having
important 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:

Red Hat Enterprise Linux (v. 5.3.z server) - i386, ia64, noarch, ppc, s390x, x86_64

3. Description:

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

This update fixes the following security issue:

* 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 bugs:

* A race condition existed when generating new process IDs with the result
that the wrong process could have been signaled or killed accidentally,
leading to various application faults. This update detects and disallows
the reuse of PID numbers. (BZ#638864)

* When multiple JBD-based (Journaling Block Device) file systems were
mounted concurrently, and no other JBD-based file systems were already
mounted, a race could occur between JBD slab cache creation and deletion.
(BZ#645653)

* A missing memory barrier caused a race condition in the AIO subsystem
between the read_events() and aio_complete() functions. This may have
caused a thread in read_events() to sleep indefinitely, possibly causing an
application hang. (BZ#638868)

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/):

612028 - CVE-2010-2521 kernel: nfsd4: bug in read_buf
638864 - [5.5] a race in pid generation that causes pids to be reused immediately. [rhel-5.3.z]
638868 - race in aio_complete() leads to process hang [rhel-5.3.z]
645653 - [Patch] jbd slab cache creation/deletion is racey [rhel-5.3.z]

6. Package List:

Red Hat Enterprise Linux (v. 5.3.z server):

Source:
kernel-2.6.18-128.26.1.el5.src.rpm

i386:
kernel-2.6.18-128.26.1.el5.i686.rpm
kernel-PAE-2.6.18-128.26.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-128.26.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-128.26.1.el5.i686.rpm
kernel-debug-2.6.18-128.26.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-128.26.1.el5.i686.rpm
kernel-debug-devel-2.6.18-128.26.1.el5.i686.rpm
kernel-debuginfo-2.6.18-128.26.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-128.26.1.el5.i686.rpm
kernel-devel-2.6.18-128.26.1.el5.i686.rpm
kernel-headers-2.6.18-128.26.1.el5.i386.rpm
kernel-xen-2.6.18-128.26.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-128.26.1.el5.i686.rpm
kernel-xen-devel-2.6.18-128.26.1.el5.i686.rpm

ia64:
kernel-2.6.18-128.26.1.el5.ia64.rpm
kernel-debug-2.6.18-128.26.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-128.26.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-128.26.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-128.26.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-128.26.1.el5.ia64.rpm
kernel-devel-2.6.18-128.26.1.el5.ia64.rpm
kernel-headers-2.6.18-128.26.1.el5.ia64.rpm
kernel-xen-2.6.18-128.26.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-128.26.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-128.26.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-128.26.1.el5.noarch.rpm

ppc:
kernel-2.6.18-128.26.1.el5.ppc64.rpm
kernel-debug-2.6.18-128.26.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-128.26.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-128.26.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-128.26.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-128.26.1.el5.ppc64.rpm
kernel-devel-2.6.18-128.26.1.el5.ppc64.rpm
kernel-headers-2.6.18-128.26.1.el5.ppc.rpm
kernel-headers-2.6.18-128.26.1.el5.ppc64.rpm
kernel-kdump-2.6.18-128.26.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-128.26.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-128.26.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-128.26.1.el5.s390x.rpm
kernel-debug-2.6.18-128.26.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-128.26.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-128.26.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-128.26.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-128.26.1.el5.s390x.rpm
kernel-devel-2.6.18-128.26.1.el5.s390x.rpm
kernel-headers-2.6.18-128.26.1.el5.s390x.rpm
kernel-kdump-2.6.18-128.26.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-128.26.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-128.26.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-128.26.1.el5.x86_64.rpm
kernel-debug-2.6.18-128.26.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-128.26.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-128.26.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-128.26.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-128.26.1.el5.x86_64.rpm
kernel-devel-2.6.18-128.26.1.el5.x86_64.rpm
kernel-headers-2.6.18-128.26.1.el5.x86_64.rpm
kernel-xen-2.6.18-128.26.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-128.26.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-128.26.1.el5.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-2010-2521.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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