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
    [email protected] 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:

    [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

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:

        [email protected]

    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: https://vulners.com/cve/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 6.1.8 and 7.1.2.