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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel RDS Protocol Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1024637
SecurityTracker URL:  http://securitytracker.com/id/1024637
CVE Reference:   CVE-2010-3904   (Links to External Site)
Date:  Oct 26 2010
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5
Description:   A vulnerability was reported in the Linux Kernel. A local user can obtain elevated privileges on the target system.

A local user can issue a specially crafted RDS protocol socket call to execute arbitrary code on the target system with kernel-level privileges.

Systems with the CONFIG_RDS kernel configuration option set and with no restrictions on unprivileged users loading packet family modules are affected.

The vendor was notified on October 13, 2010.

The original advisory is available at:

http://www.vsecurity.com/resources/advisory/20101019-1/

Demonstration exploit code is available at:

http://www.vsecurity.com/download/tools/linux-rds-exploit.c

Dan Rosenberg reported this vulnerability.
Impact:   A local user can obtain elevated 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-2010-0792.html
Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  

Message History:   This archive entry is a follow-up to the message listed below.
Oct 20 2010 Linux Kernel RDS Protocol Bug Lets Local Users Gain Elevated Privileges


 Source Message Contents
Date:  Mon, 25 Oct 2010 12:55:46 -0600
Subject:  [RHSA-2010:0792-01] Important: kernel security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2010:0792-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0792.html
Issue date:        2010-10-25
CVE Names:         CVE-2010-3904 
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue are now available for
Red Hat Enterprise Linux 5.

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 server) - i386, ia64, noarch, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, 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 issue:

* The rds_page_copy_user() function in the Linux kernel Reliable Datagram
Sockets (RDS) protocol implementation was missing sanity checks. A local,
unprivileged user could use this flaw to escalate their privileges.
(CVE-2010-3904, Important)

Red Hat would like to thank Dan Rosenberg of Virtual Security Research for
reporting this issue.

Users should upgrade to these updated packages, which contain a backported
patch to correct this issue. 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/):

642896 - CVE-2010-3904 RDS sockets local privilege escalation

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kernel-2.6.18-194.17.4.el5.src.rpm

i386:
kernel-2.6.18-194.17.4.el5.i686.rpm
kernel-PAE-2.6.18-194.17.4.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-PAE-devel-2.6.18-194.17.4.el5.i686.rpm
kernel-debug-2.6.18-194.17.4.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-debug-devel-2.6.18-194.17.4.el5.i686.rpm
kernel-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-debuginfo-common-2.6.18-194.17.4.el5.i686.rpm
kernel-devel-2.6.18-194.17.4.el5.i686.rpm
kernel-headers-2.6.18-194.17.4.el5.i386.rpm
kernel-xen-2.6.18-194.17.4.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-xen-devel-2.6.18-194.17.4.el5.i686.rpm

noarch:
kernel-doc-2.6.18-194.17.4.el5.noarch.rpm

x86_64:
kernel-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debug-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debug-devel-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debuginfo-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-194.17.4.el5.x86_64.rpm
kernel-devel-2.6.18-194.17.4.el5.x86_64.rpm
kernel-headers-2.6.18-194.17.4.el5.x86_64.rpm
kernel-xen-2.6.18-194.17.4.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-194.17.4.el5.x86_64.rpm
kernel-xen-devel-2.6.18-194.17.4.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kernel-2.6.18-194.17.4.el5.src.rpm

i386:
kernel-2.6.18-194.17.4.el5.i686.rpm
kernel-PAE-2.6.18-194.17.4.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-PAE-devel-2.6.18-194.17.4.el5.i686.rpm
kernel-debug-2.6.18-194.17.4.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-debug-devel-2.6.18-194.17.4.el5.i686.rpm
kernel-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-debuginfo-common-2.6.18-194.17.4.el5.i686.rpm
kernel-devel-2.6.18-194.17.4.el5.i686.rpm
kernel-headers-2.6.18-194.17.4.el5.i386.rpm
kernel-xen-2.6.18-194.17.4.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-194.17.4.el5.i686.rpm
kernel-xen-devel-2.6.18-194.17.4.el5.i686.rpm

ia64:
kernel-2.6.18-194.17.4.el5.ia64.rpm
kernel-debug-2.6.18-194.17.4.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-194.17.4.el5.ia64.rpm
kernel-debug-devel-2.6.18-194.17.4.el5.ia64.rpm
kernel-debuginfo-2.6.18-194.17.4.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-194.17.4.el5.ia64.rpm
kernel-devel-2.6.18-194.17.4.el5.ia64.rpm
kernel-headers-2.6.18-194.17.4.el5.ia64.rpm
kernel-xen-2.6.18-194.17.4.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-194.17.4.el5.ia64.rpm
kernel-xen-devel-2.6.18-194.17.4.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-194.17.4.el5.noarch.rpm

ppc:
kernel-2.6.18-194.17.4.el5.ppc64.rpm
kernel-debug-2.6.18-194.17.4.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-194.17.4.el5.ppc64.rpm
kernel-debug-devel-2.6.18-194.17.4.el5.ppc64.rpm
kernel-debuginfo-2.6.18-194.17.4.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-194.17.4.el5.ppc64.rpm
kernel-devel-2.6.18-194.17.4.el5.ppc64.rpm
kernel-headers-2.6.18-194.17.4.el5.ppc.rpm
kernel-headers-2.6.18-194.17.4.el5.ppc64.rpm
kernel-kdump-2.6.18-194.17.4.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-194.17.4.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-194.17.4.el5.ppc64.rpm

s390x:
kernel-2.6.18-194.17.4.el5.s390x.rpm
kernel-debug-2.6.18-194.17.4.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-194.17.4.el5.s390x.rpm
kernel-debug-devel-2.6.18-194.17.4.el5.s390x.rpm
kernel-debuginfo-2.6.18-194.17.4.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-194.17.4.el5.s390x.rpm
kernel-devel-2.6.18-194.17.4.el5.s390x.rpm
kernel-headers-2.6.18-194.17.4.el5.s390x.rpm
kernel-kdump-2.6.18-194.17.4.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-194.17.4.el5.s390x.rpm
kernel-kdump-devel-2.6.18-194.17.4.el5.s390x.rpm

x86_64:
kernel-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debug-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debug-devel-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debuginfo-2.6.18-194.17.4.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-194.17.4.el5.x86_64.rpm
kernel-devel-2.6.18-194.17.4.el5.x86_64.rpm
kernel-headers-2.6.18-194.17.4.el5.x86_64.rpm
kernel-xen-2.6.18-194.17.4.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-194.17.4.el5.x86_64.rpm
kernel-xen-devel-2.6.18-194.17.4.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-2010-3904.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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