Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.0621 Vulnerability in AIX sendmail 28 June 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: sendmail Publisher: IBM Operating System: AIX UNIX variants (UNIX, Linux, OSX) Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2012-2200 Comment: This advisory references vulnerabilities in products which run on platforms other than AIX. It is recommended that administrators running sendmail check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 IBM SECURITY ADVISORY First Issued: Tue Jun 26 14:05:11 CDT 2012 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/sendmail1_advisory.asc =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: Vulnerability in AIX sendmail PLATFORMS: AIX 6.1, and 7.1 releases SOLUTION: Apply the fix as described below THREAT: sendmail runs piped commands in .forward with root privilages CVE Number: CVE-2012-2200 Reboot required? NO Workarounds? NO Protected by FPM? NO Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION AIX system set up with stock sendmail will run arbitrary code through a users .forward II. CVSS CVSS Base Score: 7.2 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/76466 for the current score CVSS Environmental Score*: Undefined CVSS String: (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.net.tcp.client The following fileset levels are vulnerable: AIX Fileset Lower Level Upper Level ------------------------------------------------ bos.net.tcp.client 6.1.6.0 6.1.6.20 bos.net.tcp.client 6.1.7.0 6.1.7.16 bos.net.tcp.client 7.1.0.0 7.1.0.21 bos.net.tcp.client 7.1.1.0 7.1.1.16 IV. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR number Availability --------------------------------------------------- 6.1.6 IV22965 12/12/12 sp10 6.1.7 IV22966 12/12/12 sp6 7.1.0 IV22964 12/12/12 sp8 7.1.1 IV22963 12/12/12 sp6 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IV22965 http://www.ibm.com/support/docview.wss?uid=isg1IV22966 http://www.ibm.com/support/docview.wss?uid=isg1IV22964 http://www.ibm.com/support/docview.wss?uid=isg1IV22963 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/sendmail1_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) ------------------------------------------------------------------- 6.1.6.7 IV22965s07.120613.epkg.Z 6.1.7.4 IV22966s04.120613.epkg.Z 7.1.0.5 IV22964s05.120613.epkg.Z 7.1.1.4 IV22963s04.120613.epkg.Z VIOS Level Interim Fix (*.Z) ------------------------------------------------------------------- 2.2.1.4-FP-25 SP-02 IV22966s04.120613.epkg.Z To extract the fixes from the tar file: tar xvf sendmail1_fix.tar cd sendmail1_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 ------------------------------------------------------------------ ee86e5eebf46c8fe82fc4b03b42c9463b5e5facd IV22965s07.120613.epkg.Z 940db4f9d8369837b599aad6932f1bbc34b4fbec IV22966s04.120613.epkg.Z a10703ae2a264b15adc6eb88609985c78728bb90 IV22964s05.120613.epkg.Z 188d4f9ffbd8591e331d174419f9ba3d4924801c IV22963s04.120613.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; 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. 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: 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 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/76466 CVE-2012-2200: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2200 *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 v1.4.7 (AIX) iD8DBQFP6hS14fmd+Ci/qhIRAnUWAJ49LlskVsCu9qG5XcoxUA/qmnhX+wCfR511 V36LcQ3Aa2P6zL+HuxaSR8k= =vViH - -----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 =========================================================================== 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 iQIVAwUBT+u5uO4yVqjM2NGpAQLqCQ/+O4SyOG58dTxjv/mTj75k0l7/hzyLqDOg DgCikhIGhNR/oBCm/bAxvhHSHYI0YMUjIQjSKS0blvJOKVbGoBT7zW4d2NBXwqFP eunkMKGMnionuw1YypgOsCXpJKrD3X6Tn93Dmi1jsyWN1BGvu5LJ5JpVG98HR8Wu eOX1mZArqKNgFZ73Ai8S1ejW3keYW4PI95EGd99JECRnwpBo67UWDgpp6Wiv9c0x oTZXHvdSRSl9KCf/YSSLdMS03PpwaF4xVnbHfxDz6sK30ArNCtgy0pFj5wiD04E3 XdKQLTTOam2Rhq9tp7wS05TX9poWPL8v1DtUCwJ6seC2FqWe+VORbDJz6osqAjXF 2GSMlzbnz5kMlohylv77S2rgY+qVD7pbvBywvSk4UdWQ5asIlnxbf1zlwjzgoHnM FFxRV1d7nrMN3izGdkuQ35J2hD0Jcl+brd2GVSK3K+cACUzEFkIJk0PHFPbq49e0 pF1fi6RO2Zf8gU0uHMfMIz7/mS46muDaPQGODqdaxK1ly7ce+fpc7LfP9A8tgJEW UvkE9d/iKG999wq9GcVlJ6VCYWhFMEeTuY5twGxEgrEika9IN17v5EniIwO0jmkY qTjWleJQ61fsTDwA1IdxhxMmTHCCmJ58oW95q7KVWrmYGsqD6LxRqScX/4TodwoX 4HwIypbm/bs= =+Vu8 -----END PGP SIGNATURE-----