Date: 31 March 2010
References: ASB-2009.1073 ESB-2009.1450
Click here for printable version
Click here for PGP verifiable version
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2010.0306
AIX sendmail SSL certificate vulnerability
31 March 2010
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: sendmail
Publisher: IBM
Operating System: AIX
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-4565 CVE-2009-2408
Reference: ASB-2009.1073
ESB-2009.1450
Original Bulletin:
http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=18&ID=5002&myns=paix53&mync=E
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
IBM SECURITY ADVISORY
First Issued: Mon Mar 29 15:54:57 CDT 2010
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/sendmail_advisory.asc
VULNERABILITY SUMMARY
VULNERABILITY: AIX sendmail SSL certificate vulnerability
PLATFORMS: AIX 5.3, 6.1
VIOS 1.5, 2.1
SOLUTION: Apply the fix or workaround as described below.
THREAT: A man-in-the-middle attacker may be able to
spoof arbitrary SSL SMTP servers
CERT VU Number: n/a
CVE Number: CVE-2009-4565
Reboot required? NO
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
DETAILED INFORMATION
I. DESCRIPTION (from CVE)
"sendmail before 8.14.4 does not properly handle a '\0' character
in a Common Name (CN) field of an X.509 certificate, which (1)
allows man-in-the-middle attackers to spoof arbitrary SSL-based
SMTP servers via a crafted server certificate issued by a
legitimate Certification Authority, and (2) allows remote
attackers to bypass intended access restrictions via a crafted
client certificate issued by a legitimate Certification Authority,
a related issue to CVE-2009-2408."
II. PLATFORM VULNERABILITY ASSESSMENT
Note: To use the following commands on VIOS you must first
execute:
oem_setup_env
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 5.3.8.0 5.3.8.11
bos.net.tcp.client 5.3.9.0 5.3.9.7
bos.net.tcp.client 5.3.10.0 5.3.10.2
bos.net.tcp.client 5.3.11.0 5.3.11.2
bos.net.tcp.client 6.1.1.0 6.1.1.7
bos.net.tcp.client 6.1.2.0 6.1.2.6
bos.net.tcp.client 6.1.3.0 6.1.3.3
bos.net.tcp.client 6.1.4.0 6.1.4.3
III. SOLUTION
A. FIXES
Fixes are now available. The fixes are interim fixes. The
fixes can be downloaded from:
http://aix.software.ibm.com/aix/efixes/security/sendmail_fix.tar
The links above are to a tar file containing this signed
advisory, fix packages, and PGP signatures for each package.
AIX Level VIOS Level Fix
------------------------------------------------------
5.3.8 1.5.2 IZ72834_08.100329.epkg.Z
5.3.9 IZ72835_09.100329.epkg.Z
5.3.10 IZ72836_10.100329.epkg.Z
5.3.11 IZ72837_11.100329.epkg.Z
6.1.1 IZ72528_01.100329.epkg.Z
6.1.2 2.1.0 IZ72515_02.100329.epkg.Z
6.1.3 2.1.1 IZ72510_03.100329.epkg.Z
6.1.4 2.1.2 IZ70637_04.100329.epkg.Z
To extract the fixes from the tar file:
tar xvf sendmail_fix.tar
cd sendmail_fix
Verify you have retrieved the fixes intact:
The checksums below were generated using the "csum -h SHA1"
(sha1sum) commands and are as follows:
csum -h SHA1 (sha1sum) filename
------------------------------------------------------------------
5643989ef10e97eba58fb49c1399dc35fd4efe59 IZ70637_04.100329.epkg.Z
9c3341316809bb06962840aa0f18157878784ec7 IZ72510_03.100329.epkg.Z
261613c73338faeaffc69b5c6314b737ac6c52a1 IZ72515_02.100329.epkg.Z
8b529961f722c4df077ba00a50d8daf293d64d71 IZ72528_01.100329.epkg.Z
4a21abf1366ed3d0052c0fcf064ff01be546447a IZ72834_08.100329.epkg.Z
b30e05ec7a60e89ccbca0bad0b9092f38795ec98 IZ72835_09.100329.epkg.Z
7821837e1954ebac5d83485348984033c93c8667 IZ72836_10.100329.epkg.Z
3bfabc5510c3d55b9c599d8bae17b11e4967bf64 IZ72837_11.100329.epkg.Z
To verify the sums, use the text of this advisory as input to
csum or sha1sum. For example:
csum -h SHA1 -i sendmail_advisory.asc
sha1sum -c sendmail_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 and describe the
discrepancy at the following addresses:
security-alert@austin.ibm.com
ahazlewo@us.ibm.com (Andy Hazlewood)
B. 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.
Fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview fix installation:
emgr -e fix_name -p # where fix_name is the name of the
# fix being previewed.
To install fix package:
emgr -e fix_name -X # where fix_name is the name of the
# fix being installed.
IMPORTANT: The fix will not take affect until any running sendmail
servers have been stopped and restarted with the following
commands:
stopsrc -s sendmail
startsrc -s'sendmail' -a'-bd -q30m'
C. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Service pack date
--------------------------------------------------------
5.3.8 IZ72834 5/19/10 sp10
5.3.9 IZ72835 5/19/10 sp7
5.3.10 IZ72836 5/19/10 sp4
5.3.11 IZ72837 5/19/10 sp4
6.1.1 IZ72528 4/21/10 sp8
6.1.2 IZ72515 4/21/10 sp7
6.1.3 IZ72510 4/21/10 sp4
6.1.4 IZ70637 4/21/10 sp4
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IZ72834
http://www.ibm.com/support/docview.wss?uid=isg1IZ72835
http://www.ibm.com/support/docview.wss?uid=isg1IZ72836
http://www.ibm.com/support/docview.wss?uid=isg1IZ72837
http://www.ibm.com/support/docview.wss?uid=isg1IZ72528
http://www.ibm.com/support/docview.wss?uid=isg1IZ72515
http://www.ibm.com/support/docview.wss?uid=isg1IZ72510
http://www.ibm.com/support/docview.wss?uid=isg1IZ70637
By subscribing, you will receive periodic email alerting you
to the status of the APAR, and a link to download the service
pack when it becomes available.
IV. WORKAROUND
None.
VI. CONTACT INFORMATION
If you would like to receive AIX Security Advisories via email,
please visit:
http://www.ibm.com/systems/support
and click on the "My notifications" link.
To view previously issued advisories, 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
ahazlewo@us.ibm.com (Andy Hazlewood)
To obtain 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 our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgpkey.txt
C. Download the key from a PGP Public Key Server. The key ID is:
0xF3807ECD
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.
VII. ACKNOWLEDGMENTS
This vulnerability was reported by sendmail.org for an issue found
by Moxie Marlinspike. This advisory was written by Andy Hazlewood
(ahazlewo@us.ibm.com).
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (AIX)
iD8DBQFLshIJxvGNyvOAfs0RAqrCAKCE8qpzbW+cZ87GgA6pMm8QCTY7XwCfbg8N
mBR8IALfZXJqaL2QTNm741c=
=XgvM
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iD8DBQFLsvMg/iFOrG6YcBERAnrAAJ4vZJfWNsBtL1YXOC2yhjsZuuxZOwCgpkpB
zEMmvZbCZfQPGJA7xdktLOs=
=HwRT
-----END PGP SIGNATURE-----
|