CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
5.1%
IBM SECURITY ADVISORY
First Issued: Sun Jan 29 01:19:56 CST 2017
|Updated: Wed Jul 26 12:40:04 CDT 2017
|Update 1: Changed impacted upper level fileset level for AIX 7.2.1 to
| bos.net.tcp.client_core 7.2.1.0.
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc
https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc
ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc
Security Bulletin: Vulnerability in bellmail affects AIX (CVE-2017-1093)
===============================================================================
SUMMARY:
There is a vulnerability in bellmail that impacts AIX.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2017-1093
https://vulners.com/cve/CVE-2017-1093
https://vulners.com/cve/CVE-2017-1093
DESCRIPTION: IBM AIX could allow a local user to exploit a vulnerability in
the bellmail binary to gain root privileges.
CVSS Base Score: 8.4
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/120653 for more
information.
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED PRODUCTS AND VERSIONS:
AIX 6.1, 7.1, 7.2
VIOS 2.2.x
The following fileset levels are vulnerable:
key_fileset = aix
Fileset Lower Level Upper Level KEY
---------------------------------------------------------
bos.net.tcp.client 6.1.9.0 6.1.9.200 key_w_fs
bos.net.tcp.client 7.1.3.0 7.1.3.48 key_w_fs
bos.net.tcp.client 7.1.4.0 7.1.4.30 key_w_fs
bos.net.tcp.client_core 7.2.0.0 7.2.0.2 key_w_fs
| bos.net.tcp.client_core 7.2.1.0 7.2.1.0 key_w_fs
Note: To find out whether the affected filesets are installed
on your systems, refer to the lslpp command found in AIX user's guide.
Example: lslpp -L | grep -i bos.net.tcp.client
REMEDIATION:
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR Availability SP KEY
------------------------------------------------
6.1.9 IV92238 4/28/17 SP9 key_w_apar
7.1.3 IV92250 6/30/17 SP9 key_w_apar
7.1.4 IV92240 4/28/17 SP4 key_w_apar
7.2.0 IV92241 6/30/17 SP4 key_w_apar
7.2.1 IV92242 4/28/17 SP2 key_w_apar
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV92238
http://www.ibm.com/support/docview.wss?uid=isg1IV92250
http://www.ibm.com/support/docview.wss?uid=isg1IV92240
http://www.ibm.com/support/docview.wss?uid=isg1IV92241
http://www.ibm.com/support/docview.wss?uid=isg1IV92242
https://www.ibm.com/support/docview.wss?uid=isg1IV92238
https://www.ibm.com/support/docview.wss?uid=isg1IV92250
https://www.ibm.com/support/docview.wss?uid=isg1IV92240
https://www.ibm.com/support/docview.wss?uid=isg1IV92241
https://www.ibm.com/support/docview.wss?uid=isg1IV92242
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 or http from:
ftp://aix.software.ibm.com/aix/efixes/security/bellmail_fix2.tar
http://aix.software.ibm.com/aix/efixes/security/bellmail_fix2.tar
https://aix.software.ibm.com/aix/efixes/security/bellmail_fix2.tar
The links above are to a tar file containing this signed
advisory, interim fixes, and OpenSSL signatures for each interim fix.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
Technology Levels.
AIX Level Interim Fix (*.Z) KEY
----------------------------------------------
6.1.9.6 IV92238m8a.170112.epkg.Z key_w_fix
6.1.9.7 IV92238m8a.170112.epkg.Z key_w_fix
6.1.9.8 IV92238m8a.170112.epkg.Z key_w_fix
7.1.3.5 IV92250m71.170112.epkg.Z key_w_fix
7.1.3.6 IV92250m71.170112.epkg.Z key_w_fix
7.1.3.7 IV92250m71.170112.epkg.Z key_w_fix
7.1.4.1 IV92240m3a.170112.epkg.Z key_w_fix
7.1.4.2 IV92240m3a.170112.epkg.Z key_w_fix
7.1.4.3 IV92240m3a.170112.epkg.Z key_w_fix
7.2.0.0 IV92241m2a.170112.epkg.Z key_w_fix
7.2.0.1 IV92241m2a.170112.epkg.Z key_w_fix
7.2.0.2 IV92241m2a.170112.epkg.Z key_w_fix
7.2.1.0 IV92242m1a.170112.epkg.Z key_w_fix
7.2.1.1 IV92242m1a.170112.epkg.Z key_w_fix
VIOS Level Interim Fix (*.Z) KEY
-----------------------------------------------
2.2.3.x IV92238m8a.170112.epkg.Z key_w_fix
2.2.4.x IV92238m8a.170112.epkg.Z key_w_fix
2.2.5.x IV92238m8a.170112.epkg.Z key_w_fix
Please note that the above table refers to AIX TL/SP level as
opposed to fileset level, i.e., 7.1.4.1 is AIX 7100-04-01.
To extract the fixes from the tar file:
tar xvf bellmail_fix2.tar
cd bellmail_fix2
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"openssl dgst -sha256 <filename>" command as the following:
openssl dgst -sha256 filename KEY
-----------------------------------------------------------------------------------------------------
7b7e3d8c23dbca6c8424acdddbac4c889f9f15d7dffa8f7fca46db7ad83ce008 IV92238m8a.170112.epkg.Z key_w_csum
2307a711eeab2106418046c93402602163967a1395d963202f49316dcc1cb3d5 IV92250m71.170112.epkg.Z key_w_csum
60f04e1bdfdb7065e4cebfb235581219aaae80a8dfa692187f790cfef8893abc IV92240m3a.170112.epkg.Z key_w_csum
254af14aec94ee9b1589e9f7420ff6dc67af2d773fa5ee94920a4ef453ebb2c0 IV92241m2a.170112.epkg.Z key_w_csum
6b52bbbbc0af980a46e817e220d5bedfade19f2ff0db26d00d6761e3d2809a8c IV92242m1a.170112.epkg.Z key_w_csum
These sums should match exactly. The OpenSSL 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
[email protected] and describe the discrepancy.
openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>
openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc.sig
https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc.sig
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; however, IBM does fully support them.
Interim fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
https://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an interim fix installation:
emgr -e epkg_name -p # where epkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e epkg_name -X # where epkg_name is the name of the
# interim fix package being installed.
WORKAROUNDS AND MITIGATIONS:
None.
===============================================================================
CONTACT US:
Note: Keywords labeled as KEY in this document are used for parsing
purposes.
If you would like to receive AIX Security Advisories via email,
please visit "My Notifications":
http://www.ibm.com/support/mynotifications
https://www.ibm.com/support/mynotifications
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
https://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Comments regarding the content of this announcement can be
directed to:
[email protected]
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt
https://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team via [email protected] you
can either:
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
https://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
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.
REFERENCES:
Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide
https://www.first.org/cvss/user-guide
On-line Calculator v3:
http://www.first.org/cvss/calculator/3.0
https://www.first.org/cvss/calculator/3.0
ACKNOWLEDGEMENTS:
Vulnerability research and notification provided by Rhino Security Labs.
CHANGE HISTORY:
First Issued: Sun Jan 29 01:19:56 CST 2017
| Updated: Wed Jul 26 12:40:04 CDT 2017
| Update 1: Changed impacted upper level fileset level for AIX 7.2.1 to
| bos.net.tcp.client_core 7.2.1.0.
===============================================================================
*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 Security Bulletin.
Disclaimer
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.
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
5.1%