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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Stack Memory Management Lets Local Users Gain Root Privileges
SecurityTracker Alert ID:  1024387
SecurityTracker URL:  http://securitytracker.com/id/1024387
CVE Reference:   CVE-2010-2240   (Links to External Site)
Date:  Sep 2 2010
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5.4.z
Description:   A vulnerability was reported in the Linux Kernel. A local user can obtain root privileges on the target system.

A local user can cause the X server (for example) to exhaust or fragment its memory space and then overwrite other memory mapped areas to execute arbitrary code on the target system with root privileges.

The original advisory is available at:

http://www.invisiblethingslab.com/resources/misc-2010/xorg-large-memory-attacks.pdf

Rafal Wojtczuk of Invisible Things Lab (ITL) reported this vulnerability.

Impact:   A local user can obtain root privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0670.html

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

Message History:   This archive entry is a follow-up to the message listed below.
Aug 19 2010 Linux Kernel Stack Memory Management Lets Local Users Gain Root Privileges



 Source Message Contents

Subject:  [RHSA-2010:0670-01] 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-2010:0670-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0670.html
Issue date:        2010-09-02
CVE Names:         CVE-2010-2240 CVE-2010-2798 
=====================================================================

1. Summary:

Updated kernel packages that fix two security issues and three bugs are now
available for Red Hat Enterprise Linux 5.4 Extended Update Support.

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 (v. 5.4.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 issues:

* When an application has a stack overflow, the stack could silently
overwrite another memory mapped area instead of a segmentation fault
occurring, which could cause an application to execute arbitrary code,
possibly leading to privilege escalation. It is known that the X Window
System server can be used to trigger this flaw. (CVE-2010-2240, Important)

* A miscalculation of the size of the free space of the initial directory
entry in a directory leaf block was found in the Linux kernel Global File
System 2 (GFS2) implementation. A local, unprivileged user with write
access to a GFS2-mounted file system could perform a rename operation on
that file system to trigger a NULL pointer dereference, possibly resulting
in a denial of service or privilege escalation. (CVE-2010-2798, Important)

Red Hat would like to thank the X.Org security team for reporting
CVE-2010-2240, with upstream acknowledging Rafal Wojtczuk as the original
reporter; and Grant Diffey of CenITex for reporting CVE-2010-2798.

This update also fixes the following bugs:

* Problems receiving network traffic correctly via a non-standard layer 3
protocol when using the ixgbe driver. This update corrects this issue.
(BZ#618275)

* A bug was found in the way the megaraid_sas driver (for SAS based RAID
controllers) handled physical disks and management IOCTLs. All physical
disks were exported to the disk layer, allowing an oops in
megasas_complete_cmd_dpc() when completing the IOCTL command if a timeout
occurred. One possible trigger for this bug was running "mkfs". This update
resolves this issue by updating the megaraid_sas driver to version 4.31.
(BZ#619363)

* Previously, Message Signaled Interrupts (MSI) resulted in PCI bus writes
to mask and unmask the MSI IRQ for a PCI device. These unnecessary PCI bus
writes resulted in the serialization of MSIs, leading to poor performance
on systems with high MSI load. This update adds a new kernel boot
parameter, msi_nolock, which forgoes the PCI bus writes and allows for
better simultaneous processing of MSIs. (BZ#621939)

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/):

606611 - CVE-2010-2240 kernel: mm: keep a guard page below a grow-down stack segment
618275 - Received data corrupts when non standards L3 protocols are used on ixgbe [rhel-5.4.z]
619363 - [LSI 5.6 feat] update megaraid_sas to version 4.31 [rhel-5.4.z]
620300 - CVE-2010-2798 kernel: gfs2: rename causes kernel panic
621939 - Significant MSI performance issue due to redundant interrupt masking [rhel-5.4.z]

6. Package List:

Red Hat Enterprise Linux (v. 5.4.z server):

Source:
kernel-2.6.18-164.25.1.el5.src.rpm

i386:
kernel-2.6.18-164.25.1.el5.i686.rpm
kernel-PAE-2.6.18-164.25.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-164.25.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-164.25.1.el5.i686.rpm
kernel-debug-2.6.18-164.25.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-164.25.1.el5.i686.rpm
kernel-debug-devel-2.6.18-164.25.1.el5.i686.rpm
kernel-debuginfo-2.6.18-164.25.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-164.25.1.el5.i686.rpm
kernel-devel-2.6.18-164.25.1.el5.i686.rpm
kernel-headers-2.6.18-164.25.1.el5.i386.rpm
kernel-xen-2.6.18-164.25.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-164.25.1.el5.i686.rpm
kernel-xen-devel-2.6.18-164.25.1.el5.i686.rpm

ia64:
kernel-2.6.18-164.25.1.el5.ia64.rpm
kernel-debug-2.6.18-164.25.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-164.25.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-164.25.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-164.25.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-164.25.1.el5.ia64.rpm
kernel-devel-2.6.18-164.25.1.el5.ia64.rpm
kernel-headers-2.6.18-164.25.1.el5.ia64.rpm
kernel-xen-2.6.18-164.25.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-164.25.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-164.25.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-164.25.1.el5.noarch.rpm

ppc:
kernel-2.6.18-164.25.1.el5.ppc64.rpm
kernel-debug-2.6.18-164.25.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-164.25.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-164.25.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-164.25.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-164.25.1.el5.ppc64.rpm
kernel-devel-2.6.18-164.25.1.el5.ppc64.rpm
kernel-headers-2.6.18-164.25.1.el5.ppc.rpm
kernel-headers-2.6.18-164.25.1.el5.ppc64.rpm
kernel-kdump-2.6.18-164.25.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-164.25.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-164.25.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-164.25.1.el5.s390x.rpm
kernel-debug-2.6.18-164.25.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-164.25.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-164.25.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-164.25.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-164.25.1.el5.s390x.rpm
kernel-devel-2.6.18-164.25.1.el5.s390x.rpm
kernel-headers-2.6.18-164.25.1.el5.s390x.rpm
kernel-kdump-2.6.18-164.25.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-164.25.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-164.25.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-164.25.1.el5.x86_64.rpm
kernel-debug-2.6.18-164.25.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-164.25.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-164.25.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-164.25.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-164.25.1.el5.x86_64.rpm
kernel-devel-2.6.18-164.25.1.el5.x86_64.rpm
kernel-headers-2.6.18-164.25.1.el5.x86_64.rpm
kernel-xen-2.6.18-164.25.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-164.25.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-164.25.1.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-2010-2240.html
https://www.redhat.com/security/data/cve/CVE-2010-2798.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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