SECURITY (Doc Number=3113): UPDATE AIX tftp Vulnerability CVE-2013-3005

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 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1  IBM SECURITY ADVISORY  First Issued: Wed Jul 3 09:33:57 CDT 2013 | Updated: Wed Jul 3 15:04:41 CDT 2013 | Update:  Fixed vulnerable fileset levels  http://aix.software.ibm.com/aix/efixes/security/tftp_advisory.asc ===============================================================================                            VULNERABILITY SUMMARY  VULNERABILITY:      tftp Security Vulnerability  PLATFORMS:          AIX 6.1 and 7.1 releases  SOLUTION:           Apply the fix as described below  THREAT:             See below  CVE Number:         CVE-2013-3005   Reboot required?    YES Workarounds?        YES Protected by FPM?   NO Protected by SED?   NO ===============================================================================                            DETAILED INFORMATION  I. DESCRIPTION       A non-root user can read and overwrite files owned by others     including root via tftp client.  II. CVSS      CVSS Base Score: 7.9     CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/85366 for the     current score     CVSS Environmental Score*: Undefined     CVSS String: (AV:N/AC:M/Au:S/C:N/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.net.tcp.client      The following fileset levels are vulnerable:      AIX Fileset        Lower Level       Upper Level     ------------------------------------------------     bos.net.tcp.client  6.1.6.0           6.1.6.22     bos.net.tcp.client  6.1.7.0           6.1.7.18     bos.net.tcp.client  6.1.8.0           6.1.8.15     bos.net.tcp.client  7.1.0.0           7.1.0.23     bos.net.tcp.client  7.1.1.0           7.1.1.18 |   bos.net.tcp.client  7.1.2.0           7.1.2.15  IV. SOLUTIONS      A. APARS          IBM has assigned the following APARs to this problem:          AIX Level           APAR number        Availability         ---------------------------------------------------         6.1.6               IV40221            08/16/13 SP12         6.1.7               IV42932            08/16/13 SP8         6.1.8               IV42933            08/16/13 SP3         7.1.0               IV42934            08/16/13 SP10         7.1.1               IV42700            08/16/13 SP8         7.1.2               IV42935            08/16/13 SP3          Subscribe to the APARs here:          http://www.ibm.com/support/docview.wss?uid=isg1IV40221         http://www.ibm.com/support/docview.wss?uid=isg1IV42932         http://www.ibm.com/support/docview.wss?uid=isg1IV42933         http://www.ibm.com/support/docview.wss?uid=isg1IV42934         http://www.ibm.com/support/docview.wss?uid=isg1IV42700         http://www.ibm.com/support/docview.wss?uid=isg1IV42935          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/tftp_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)         -------------------------------------------------------------------         6.1.6.11                      IV40221s11.130617.epkg.Z         6.1.7.7                       IV42932s7a.130617.epkg.Z          6.1.8.2                       IV42933s2a.130617.epkg.Z         7.1.0.9                       IV42934s9a.130617.epkg.Z          7.1.1.7                       IV42700s7a.130617.epkg.Z          7.1.2.2                       IV42935s2a.130617.epkg.Z           VIOS Level                    Interim Fix (*.Z)         -------------------------------------------------------------------         2.2.2.2-FP-26 SP-02           IV42933s2a.130617.epkg.Z          To extract the fixes from the tar file:          tar xvf tftp_fix.tar         cd tftp_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         ------------------------------------------------------------------ 	3a9b2000311c72c12fa8b870e6e6ae559dafe77b  IV40221s11.130617.epkg.Z 	eda458143757610c4674640498b60496e8e4ee7a  IV42932s7a.130617.epkg.Z 	2dcdc2bfbecb88c6128cef0c5c738b4d15278283  IV42933s2a.130617.epkg.Z 	dfa9d5c25fd1b3a047b0531f1899f3ecc72e8653  IV42934s9a.130617.epkg.Z 	c640ec0f67a1111d330dd1686a3b905bbb3b04df  IV42700s7a.130617.epkg.Z 	36985ee2f2d0f6d54d5184c8bfd7bef95432baf9  IV42935s2a.130617.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; 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          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       Disabling RBAC on the nodes will prevent this vulnerability.       Steps below:   	1. lsattr -E -l sys0 -a enhanced_RBAC  	2. chdev -l sys0 -a enhanced_RBAC=false 	 	3. reboot  	4. lsattr -E -l sys0 -a enhanced_RBAC  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/onvdq      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/85366     CVE-2013-3005: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-3005      *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 v1.4.13 (AIX)  iEYEARECAAYFAlHUg/kACgkQ4fmd+Ci/qhLU7gCfVieZ6hyLOwKXTrUdrKeONI+V oC4AoKWbHtjRFc1B3vZUcnJvA85UrpTf =+IpS -----END PGP SIGNATURE-----