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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel ATM clip_mkip() Function Lets Remote Users Deny Service
SecurityTracker Alert ID:  1017529
SecurityTracker URL:  http://securitytracker.com/id/1017529
CVE Reference:   CVE-2006-4997   (Links to External Site)
Date:  Jan 17 2007
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.1 (64-bit)
Description:   A vulnerability was reported in Linux Kernel in the ATM subsystem. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to access socket buffer memory that has been freed, triggering a kernel panic.

Only systems with ATM hardware installed and configured for ATM support are affected.

The vulnerability resides in the clip_mkip() function in 'net/atm/clip.c'.

Impact:   A remote user can cause a kernel panic.
Solution:   Red Hat has released a fix.

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/kernel-2.4.18-e.64.src.rpm
4198e75b94fa33262e2042ca603202ce kernel-2.4.18-e.64.src.rpm

ia64:
653a27a972fa979ef033dc81c41bc755 kernel-2.4.18-e.64.ia64.rpm
ec4ecd5ab36246b20b734faf13036a54 kernel-doc-2.4.18-e.64.ia64.rpm
e26a51d7c0992feaf4ad1b9facc3574e kernel-smp-2.4.18-e.64.ia64.rpm
f36658abf4c94c7570776fb0928b208d kernel-source-2.4.18-e.64.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/kernel-2.4.18-e.64.src.rpm
4198e75b94fa33262e2042ca603202ce kernel-2.4.18-e.64.src.rpm

ia64:
653a27a972fa979ef033dc81c41bc755 kernel-2.4.18-e.64.ia64.rpm
ec4ecd5ab36246b20b734faf13036a54 kernel-doc-2.4.18-e.64.ia64.rpm
e26a51d7c0992feaf4ad1b9facc3574e kernel-smp-2.4.18-e.64.ia64.rpm
f36658abf4c94c7570776fb0928b208d kernel-source-2.4.18-e.64.ia64.rpm

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2007-0012.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.
Jan 17 2007 Linux Kernel ATM clip_mkip() Function Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2007:0012-01] Moderate: kernel security update


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- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Moderate: kernel security update
Advisory ID:       RHSA-2007:0012-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2007-0012.html
Issue date:        2007-01-17
Updated on:        2007-01-17
Product:           Red Hat Enterprise Linux
CVE Names:         CVE-2006-2935 CVE-2006-4997 
- ---------------------------------------------------------------------

1. Summary:

Updated kernel packages that fix a number of security issues as well as
other bugs are now available for Red Hat Enterprise Linux 2.1 (64 bit
architectures)

This security advisory has been rated as having moderate security impact by
the Red Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - ia64
Red Hat Linux Advanced Workstation 2.1 - ia64

3. Problem description:

The Linux kernel handles the basic functions of the operating system.

These new kernel packages contain fixes for the security issues described
below: 

* a flaw in the ATM subsystem affecting systems with installed ATM hardware
and configured ATM support that allowed a remote user to cause a denial of
service (panic) by accessing socket buffer memory after it has been freed
(CVE-2006-4997, Moderate)

* a flaw in the DVD handling of the CDROM driver that could be used
together with a custom built USB device to gain root privileges
(CVE-2006-2935, Moderate)

In addition to the security issues described above, the following bugs are
also addressed:

* a potential overflow condition when reading /proc/devices
* a potential page corruption bug in /proc/kcore

All Red Hat Enterprise Linux 2.1 users are advised to upgrade their kernels
to these updated packages, which contain backported fixes to correct these
issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via Red Hat Network.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/):

197674 - CVE-2006-2935 Possible buffer overflow in DVD handling
207307 - CVE-2006-4997 IP over ATM clip_mkip dereference freed pointer
217621 - kernel may oops if more  than 4k worth of string data returned in /proc/devices
217628 - Memory corruption when reading /proc/kcore

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/kernel-2.4.18-e.64.src.rpm
4198e75b94fa33262e2042ca603202ce  kernel-2.4.18-e.64.src.rpm

ia64:
653a27a972fa979ef033dc81c41bc755  kernel-2.4.18-e.64.ia64.rpm
ec4ecd5ab36246b20b734faf13036a54  kernel-doc-2.4.18-e.64.ia64.rpm
e26a51d7c0992feaf4ad1b9facc3574e  kernel-smp-2.4.18-e.64.ia64.rpm
f36658abf4c94c7570776fb0928b208d  kernel-source-2.4.18-e.64.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/kernel-2.4.18-e.64.src.rpm
4198e75b94fa33262e2042ca603202ce  kernel-2.4.18-e.64.src.rpm

ia64:
653a27a972fa979ef033dc81c41bc755  kernel-2.4.18-e.64.ia64.rpm
ec4ecd5ab36246b20b734faf13036a54  kernel-doc-2.4.18-e.64.ia64.rpm
e26a51d7c0992feaf4ad1b9facc3574e  kernel-smp-2.4.18-e.64.ia64.rpm
f36658abf4c94c7570776fb0928b208d  kernel-source-2.4.18-e.64.ia64.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:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2935
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4997
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2007 Red Hat, Inc.
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