SecurityTracker.com
Keep Track of the Latest Vulnerabilities
with SecurityTracker!
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 
Sign Up
Sign Up for Your FREE Weekly SecurityTracker E-mail Alert Summary
Instant Alerts
Buy our Premium Vulnerability Notification Service to receive customized, instant alerts
Affiliates
Put SecurityTracker Vulnerability Alerts on Your Web Site -- It's Free!
Partners
Become a Partner and License Our Database or Notification Service
Report a Bug
Report a vulnerability that you have found to SecurityTracker
bugs
@
securitytracker.com






Category:   OS (UNIX)  >   IBM AIX Vendors:   IBM
IBM AIX TCP Large Send Offload Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026640
SecurityTracker URL:  http://securitytracker.com/id/1026640
CVE Reference:   CVE-2012-0194   (Links to External Site)
Date:  Feb 4 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.3, 6.1, 7.1
Description:   A vulnerability was reported in IBM AIX. A remote user can cause denial of service conditions.

A remote user can send a series of specially crafted TCP packets to trigger a kernel panic on the target system.

Systems with the TCP large send offload option enabled on a network interface are affected.

Impact:   A remote user can cause the target system to crash.
Solution:   The vendor has issued a fix (APARs IV13827, IV13751, IV13820, IV14209, IV14210, IV14211).

The vendor's advisory is available at:

http://aix.software.ibm.com/aix/efixes/security/large_send_advisory.asc

Vendor URL:  aix.software.ibm.com/aix/efixes/security/large_send_advisory.asc (Links to External Site)
Cause:   State error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Sat, 04 Feb 2012 18:07:22 +0000
Subject:  IBM AIX


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

IBM SECURITY ADVISORY

First Issued: Fri Feb 3 10:20:44 CST 2012

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/large_send_advisory.asc
===============================================================================
VULNERABILITY SUMMARY

VULNERABILITY: Vulnerability in AIX TCP stack

PLATFORMS: AIX 5.3, 6.1, and 7.1 releases

SOLUTION: Apply the fix as described below.

THREAT: TCP network packet denial of service

CVE Number: CVE-2012-0194

Reboot required? YES
Workarounds? YES
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION

I. DESCRIPTION

AIX could allow a remote attacker to cause a denial of service, caused
by an error when the TCP large send offload option is enabled on a
network interface. By sending a specially-crafted sequence of packets,
an attacker could exploit this vulnerability to cause a kernel panic.

II. CVSS

CVSS Base Score: 7.1
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/72562 for the
current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:n/AC:m/Au:n/C:n/I:n/A:c)

III. PLATFORM VULNERABILITY ASSESSMENT

To determine if your system is vulnerable, execute the following
command:

lslpp -L bos.net.tcp.client

The following fileset levels are vulnerable:

AIX Fileset Lower Level Upper Level
------------------------------------------------
bos.net.tcp.client     5.3.12.0      5.3.12.5
bos.net.tcp.client     6.1.5.0 6.1.5.8
bos.net.tcp.client     6.1.6.0 6.1.6.17
bos.net.tcp.client     6.1.7.0 6.1.7.3
bos.net.tcp.client     7.1.0.0 7.1.0.17
bos.net.tcp.client     7.1.1.0 7.1.1.3

IV. SOLUTIONS

A. APARS

IBM has assigned the following APARs to this problem:

AIX Level APAR number Availability
---------------------------------------------------
5.3.12 IV13827 TBD sp6
6.1.5 IV13751 TBD sp9
6.1.6 IV13820 TBD sp8
6.1.7 IV14209 TBD sp4
7.1.0 IV14210 TBD sp5
7.1.1 IV14211 TBD sp4

Subscribe to the APARs here:

http://www.ibm.com/support/docview.wss?uid=isg1IV13827
http://www.ibm.com/support/docview.wss?uid=isg1IV13751
http://www.ibm.com/support/docview.wss?uid=isg1IV13820
http://www.ibm.com/support/docview.wss?uid=isg1IV14209
http://www.ibm.com/support/docview.wss?uid=isg1IV14210
http://www.ibm.com/support/docview.wss?uid=isg1IV14211

By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the fix once
it becomes available.

B. FIXES

Fixes are available. The fixes can be downloaded via ftp
from:

ftp://aix.software.ibm.com/aix/efixes/security/large_send_fix.tar

The link above is to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
Technology Levels.

AIX Level Interim Fix (*.Z)
-------------------------------------------------------------------
5.3.12.5 53XSP5_IV13827s05.120126.epkg.Z
6.1.5.7 61JSP7_IV13751s07.120126.epkg.Z
6.1.6.16 61NSP6_IV13820s06.120126.epkg.Z
6.1.7.2 61QS02_IV14209s02.120126.epkg.Z
7.1.0.17 71BSP4_IV14210s04.120129.epkg.Z
7.1.1.02 71DSP2_IV14211s02.120126.epkg.Z

To extract the fixes from the tar file:

tar xvf large_send_fix.tar
cd large_send_fix

Verify you have retrieved the fixes intact:

The checksums below were generated using the
"csum -h SHA1" (sha1sum) command is the followng:

csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
788096451a8e621a04bf8967b9c55cbe18fe334a
53XSP5_IV13827s05.120126.epkg.Z
37aca7ad354a8e0775152f6801c0d9790a990782
61JSP7_IV13751s07.120126.epkg.Z
637048a0ab3764d712a837815cccf355bf4be245
61NSP6_IV13820s06.120126.epkg.Z
12fddcb7e3ee87144a8ed8008c4e40ea70df8262
61QS02_IV14209s02.120126.epkg.Z
246e09b69f741a1c552042c065bfc0854167c5f3
71BSP4_IV14210s04.120129.epkg.Z
5945422d284849fd2f268a5b54a62eeb2fcae18b
71DSP2_IV14211s02.120126.epkg.Z

To verify the sum, use the text of this advisory as input to sha1sum.
For example:

csum -h SHA1 -i Advisory.asc
sha1sum -c Advisory.asc

These sums should match exactly. The PGP signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes. If the sums or signatures cannot be
confirmed, contact IBM AIX Security at
security-alert@austin.ibm.com and describe the discrepancy.

C. FIX AND INTERIM FIX INSTALLATION

IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.

To preview a fix installation:

installp -a -d fix_name -p all # where fix_name is the name of the
# fix package being previewed.
To install a fix package:

installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.

Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; thus, IBM does not warrant the fully
correct functionality of an interim fix.

Interim fix management documentation can be found at:

http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html

To preview an interim fix installation:

emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.

To install an interim fix package:

emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.

V. WORKAROUNDS

Adjust the lowest value from the common path MTUs table based on
customer configuration.
Turn off large send function (may have performance impact)
Turn off path MTU discovery (may have performance impact)

VI. OBTAINING FIXES

AIX security fixes can be downloaded from:

ftp://aix.software.ibm.com/aix/efixes/security

AIX fixes can be downloaded from:

http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix

NOTE: Affected customers are urged to upgrade to the latest
applicable Technology Level and Service Pack.

VII. CONTACT INFORMATION

If you would like to receive AIX Security Advisories via email,
please visit:

http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd

Comments regarding the content of this announcement can be
directed to:

security-alert@austin.ibm.com

To request the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:

A. Send an email with "get key" in the subject line to:

security-alert@austin.ibm.com

B. Download the key from a PGP Public Key Server. The key ID is:

0x28BFAA12

Please contact your local IBM AIX support center for any
assistance.

eServer is a trademark of International Business Machines
Corporation. IBM, AIX and pSeries are registered trademarks of
International Business Machines Corporation. All other trademarks
are property of their respective holders.

VIII. REFERENCES:

Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2:
http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/72562
CVE-2012-0194: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0194

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the
impact of this vulnerability in their environments by accessing the links
in the Reference section of this Flash.

Note: According to the Forum of Incident Response and Security Teams
(FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
open standard designed to convey vulnerability severity and help to
determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
"AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
VULNERABILITY.


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (AIX)

iD8DBQFPLBAN4fmd+Ci/qhIRAg0vAJ9FUz7cBsmBZQR31F3iZ72rGI1sGACgpUgK
Z24srRLdz/La1434OpWjksA=
=fucU
-----END PGP SIGNATURE-----

 
 


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

Copyright 2014, SecurityGlobal.net LLC