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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:  1024535
SecurityTracker URL:  http://securitytracker.com/id/1024535
CVE Reference:   CVE-2010-2240   (Links to External Site)
Date:  Oct 8 2010
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Red Hat Enterprise MRG 1.2 for RHEL 5
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-2010-0758.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-2010:0758-01] Important: kernel-rt security and bug fix update

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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2010:0758-01
Product:           Red Hat Enterprise MRG for RHEL-5
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0758.html
Issue date:        2010-10-07
CVE Names:         CVE-2010-3067 CVE-2010-3081 
=====================================================================

1. Summary:

Updated kernel-rt packages that fix two security issues and three bugs are
now available for Red Hat Enterprise MRG 1.2.

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:

MRG Realtime for RHEL 5 Server - i386, noarch, x86_64

3. Description:

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

This update fixes the following security issues:

* The compat_alloc_user_space() function in the Linux kernel 32/64-bit
compatibility layer implementation was missing sanity checks. This function
could be abused in other areas of the Linux kernel if its length argument
can be controlled from user-space. On 64-bit systems, a local, unprivileged
user could use this flaw to escalate their privileges. (CVE-2010-3081,
Important)

* A missing upper bound integer check was found in the sys_io_submit()
function in the Linux kernel asynchronous I/O implementation. A local,
unprivileged user could use this flaw to cause an information leak.
(CVE-2010-3067, Low)

Red Hat would like to thank Ben Hawkes for reporting CVE-2010-3081, and
Tavis Ormandy for reporting CVE-2010-3067.

This update also fixes the following bugs:

* The RHSA-2010:0631 kernel-rt update resolved an issue (CVE-2010-2240)
where, when an application has a stack overflow, the stack could silently
overwrite another memory mapped area instead of a segmentation fault
occurring. This update implements the official upstream fixes for that
issue. Note: This is not a security regression. The original fix was
complete. (BZ#624604)

* In certain circumstances, under heavy load, certain network interface
cards using the bnx2 driver, and configured to use MSI-X, could stop
processing interrupts and then network connectivity would cease.
(BZ#622952)

* This update upgrades the tg3 driver to version 3.110. (BZ#640334)

Users are advised to 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/):

624604 - Backport official CVE-2010-2240 fixes
629441 - CVE-2010-3067 kernel: do_io_submit() infoleak
634457 - CVE-2010-3081 kernel: 64-bit Compatibility Mode Stack Pointer Underflow
640334 - update MRG 1.2 tg3 driver to latest upstream driver

6. Package List:

MRG Realtime for RHEL 5 Server:

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/RHEMRG/SRPMS/kernel-rt-2.6.24.7-169.el5rt.src.rpm

i386:
kernel-rt-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debug-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debug-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debug-devel-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debuginfo-common-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-devel-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-trace-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-trace-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-trace-devel-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-vanilla-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-vanilla-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-vanilla-devel-2.6.24.7-169.el5rt.i686.rpm

noarch:
kernel-rt-doc-2.6.24.7-169.el5rt.noarch.rpm

x86_64:
kernel-rt-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debug-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debug-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debug-devel-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debuginfo-common-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-devel-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-trace-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-trace-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-trace-devel-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-vanilla-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-vanilla-devel-2.6.24.7-169.el5rt.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-2010-3067.html
https://www.redhat.com/security/data/cve/CVE-2010-3081.html
http://www.redhat.com/security/updates/classification/#important
https://access.redhat.com/kb/docs/DOC-40265

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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