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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2014.1417.2
AIX Malloc vulnerability
17 March 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: AIX
Publisher: IBM
Operating System: AIX
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-3074
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc
Revision History: March 17 2015: Changed affected upper file set levels for 6.1.8 and 7.1.2
August 20 2014: Initial Release
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IBM SECURITY ADVISORY
|Updated: Tue Mar 10 11:31:13 CDT 2015
|Update: Changed affected upper file set levels for 6.1.8 and
| 7.1.2.
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc
https://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: AIX Malloc vulnerability
PLATFORMS: AIX 5.3, 6.1 and 7.1 releases
VIOS 2.2.*
SOLUTION: Apply the fix as described below
THREAT: An attacker could gain lateral or elevated privileges
CVE Number: CVE-2014-3074 CVSS=7.2
Reboot required? YES
Workarounds? NO
Protected by FPM? NO
Protected by SED? NO
===============================================================================
DETAILED INFORMATION
I. DESCRIPTION
It has been identified that the runtime linker allows privilege escalation
via arbitrary file writes with elevated privileges programs. When
MALLOCOPTIONS and MALLOCBUCKETS environment variables are set with bucket
statistics options and by executing certain setuid programs, a
non-privileged user may able to create a root owned file with 666 permission.
In AIX6.1 and above, a local user can also exploit this error using the
_LIB_INIT_DBG and _LIB_INIT_DBG_FILE environment variables.
II. CVSS
CVSS Base Score: 7.2
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/93816 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C)
III. 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.rte.libc
The following fileset levels are vulnerable:
AIX Fileset Lower Level Upper Level KEY
--------------------------------------------------------
bos.rte.libc 5.3.12.0 5.3.12.9 key_w_fs
bos.rte.libc 6.1.7.0 6.1.7.20 key_w_fs
| bos.rte.libc 6.1.8.0 6.1.8.18 key_w_fs
bos.rte.libc 6.1.9.0 6.1.9.15 key_w_fs
bos.rte.libc 7.1.1.0 7.1.1.20 key_w_fs
| bos.rte.libc 7.1.2.0 7.1.2.18 key_w_fs
bos.rte.libc 7.1.3.0 7.1.3.15 key_w_fs
AIX Fileset (VIOS) Lower Level Upper Level
----------------------------------------------------------------
bos.rte.libc 6.1.7.0(2.2.1.0) 6.1.7.20(2.2.1.8)
| bos.rte.libc 6.1.8.0(2.2.2.0) 6.1.8.18(2.2.2.5)
bos.rte.libc 6.1.9.0(2.2.3.0) 6.1.9.15(2.2.3.3)
IV. SOLUTIONS
A. APARS
IBM has assigned the following APARs to this problem:
AIX Level APAR number Availability KEY
------------------------------------------------------------
5.3.12 IV62812 ifix_only n/a key_w_apar
6.1.7 IV62802 ifix_only n/a key_w_apar
6.1.8 IV62803 12/31/2014 SP6 key_w_apar
6.1.9 IV62805 10/24/2014 SP4 key_w_apar
7.1.1 IV62806 ifix_only n/a key_w_apar
7.1.2 IV62807 12/31/2014 SP6 key_w_apar
7.1.3 IV62808 10/24/2014 SP4 key_w_apar
VIOS Level APAR number Availability
---------------------------------------------------
2.2.1 IV62802 ifix_only n/a
2.2.2 IV62803 12/31/2014 2.2.2.5
2.2.3 IV62805 10/24/2014 2.2.3.4
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IV62812
http://www.ibm.com/support/docview.wss?uid=isg1IV62802
http://www.ibm.com/support/docview.wss?uid=isg1IV62803
http://www.ibm.com/support/docview.wss?uid=isg1IV62805
http://www.ibm.com/support/docview.wss?uid=isg1IV62806
http://www.ibm.com/support/docview.wss?uid=isg1IV62807
http://www.ibm.com/support/docview.wss?uid=isg1IV62808
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
If any of the following Interim Fixes exist, they must be
removed first:
AIX Level Interim Fix (*.Z) APAR#
----------------------------------------------
5.3.12.9 n/a
6.1.7.9 IV61313s9a.140610.epkg.Z IV61313
6.1.8.4 IV61311s4a.140610.epkg.Z IV61311
6.1.9.3 IV60935s3a.140610.epkg.Z IV60935
7.1.1.9 IV61315s9a.140611.epkg.Z IV61315
7.1.2.4 IV61314s4a.140610.epkg.Z IV61314
7.1.3.3 IV60940s3a.140610.epkg.Z IV60940
Fixes are available. These supercede and include the original
vulnerability fixes in the above list. The fixes can be downloaded
via ftp from:
ftp://aix.software.ibm.com/aix/efixes/security/malloc_fix.tar
The link above is to a tar file containing this signed
advisory, fix packages, and OpenSSL signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
Technology Levels.
Note: these fixes do not include a fix for the bos.adt.prof profiled
libc. If this is the case, please call IBM Support for a separate ifix
for the profiled libc version if required.
AIX Level Interim Fix (*.Z) KEY
---------------------------------------------------
5.3.12.9 IV62812s9a.140728.epkg.Z key_w_fix
6.1.7.9 IV62802s9a.140730.epkg.Z key_w_fix
6.1.8.4 IV62803s4a.140730.epkg.Z key_w_fix
6.1.9.3 IV62805s3a.140731.epkg.Z key_w_fix
7.1.1.9 IV62806s9a.140730.epkg.Z key_w_fix
7.1.2.4 IV62807s4a.140730.epkg.Z key_w_fix
7.1.3.3 IV62808s3a.140731.epkg.Z key_w_fix
VIOS Level Interim Fix (*.Z)
-------------------------------------
2.2.1.8 IV62802s9a.140730.epkg.Z
2.2.2.4 IV62803s4a.140730.epkg.Z
2.2.3.3 IV62805s3a.140731.epkg.Z
To extract the fixes from the tar file:
tar xvf malloc_fix.tar
cd malloc_ifix
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"openssl dgst -sha256 file" command is the following:
openssl dgst -sha256 filename KEY
----------------------------------------------------------------------------------------------------
b592baf31e12a94c4652a00fce50b7e9d4eaafd0dab5812c3adeef3b20cc86b0 IV62812s9a.140728.epkg.Z key_w_sum
161e521ac69f0959795651049faf0830c9bc26d19a813d4300714e8391422d14 IV62802s9a.140730.epkg.Z key_w_sum
f56e41d47a1fd8d4fa2e582b12bd0cf47745a332d5e7fcc560d23073a27f97a6 IV62803s4a.140730.epkg.Z key_w_sum
b0505e3dbaa8c5f2be2d4f8e3d4bd3a8c56b089aee272582a88a5606361f822c IV62805s3a.140731.epkg.Z key_w_sum
8583fb86c06dfeca9602424e1602eaf622cf70d09920d3537ab8d05b75690f3d IV62806s9a.140730.epkg.Z key_w_sum
e2080763f480ad3d1c65a19fbf478181ffff61ea8238f8b20723d1b5ec20d5d9 IV62807s4a.140730.epkg.Z key_w_sum
3214e13ccc3db908f5791ba5d2d1a5eccf658eeae03ccd94396b3d7e491cd5e3 IV62808s3a.140731.epkg.Z key_w_sum
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
security-alert@austin.ibm.com and describe the discrepancy.
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc.sig
https://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/malloc_advisory.asc.sig
openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>
openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>
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.
To list all installed Interim Fixes:
emgr -l
To remove an installed Interim Fix:
emgr -r -L ipkg_label # where ipgk_label is the label (e.g.,
# IV61313s9a) of the interim fix
# package being removed.
V. WORKAROUNDS
None
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 "My Notifications":
http://www.ibm.com/support/mynotifications
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Comments regarding the content of this announcement can be
directed to:
security-alert@austin.ibm.com
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
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.
VIII. ACKNOWLEDGMENTS
This vulnerability was reported by Tim Brown from Portcullis Computer
Security Ltd.
IX. 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/75510
CVE-2014-3074: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3074
*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.
X. CHANGE HISTORY:
First Issued: Mon Jun 30 10:24:42 CDT 2014
Updated: Tue Jul 1 12:35:38 CDT 2014
Update: Corrected public key URL.
Updated: Wed Jul 2 15:20:29 CDT 2014
Update: Added published advisory OpenSSL signature file.
Updated: Thu Jul 3 07:42:49 CDT 2014
Update: Renamed tar file for TNC compliancy
Udated: Mon Jul 07 12:58:32 PM CDT 2014
Update: Update to APAR information and fileset keyword
Updated: Fri Aug 15 10:10:57 CDT 2014
Update: Cumulative updated Iterim fixes includes new fix
Update: for _LIB_INIT_DBG_FILE environment variable exploit.
Update: See description below.
Updated: Tue Mar 10 11:31:13 CDT 2015
Update: Changed affected upper file set levels for
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