IBM SECURITY ADVISORY First Issued: Mon Jul 16 13:28:25 CDT 2012 | Updated: Tue Sept 27 9:50:28 CDT 2012 | Update: New ifixes to include sendmail_ssl and sendmail_nossl | Update: Corrected file names | Update: New ifixes for the latest SP's | Updated: Thu Dec 12 12:55:11 CST 2013 | Update: 1. Added KEYs for parsing purposes | 2. Moved to OpenSSL signature The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/sendmail1_advisory.asc ftp://aix.software.ibm.com/aix/efixes/security/sendmail1_advisory.asc =============================================================================== VULNERABILITY SUMMARY | VULNERABILITY: Vulnerability in AIX sendmail, sendmail_ssl and | sendmail_nossl PLATFORMS: AIX 6.1, and 7.1 releases SOLUTION: Apply the fix as described below | THREAT: sendmail, sendmail_ssl and sendmail_nossl runs piped commands in .forward with root privilages CVE Number: CVE-2012-2200 CVSS=7.2 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. This apples to sendmail_ssl and sendmail_nossl 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 KEY ----------------------------------------------------------- | bos.net.tcp.client 6.1.6.0 6.1.6.20 key_w_fs | bos.net.tcp.client 6.1.7.0 6.1.7.16 key_w_fs | bos.net.tcp.client 7.1.0.0 7.1.0.21 key_w_fs | bos.net.tcp.client 7.1.1.0 7.1.1.16 key_w_fs IV. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR number Availability KEY ----------------------------------------------------------------- 6.1.6 IV22965 12/12/12 sp10 key_w_apar 6.1.7 IV22966 12/12/12 sp6 key_w_apar 7.1.0 IV22964 12/12/12 sp8 key_w_apar 7.1.1 IV22963 12/12/12 sp6 key_w_apar 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 OpenSSL 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) KEY ------------------------------------------------------------------- | 6.1.6.8 IV22965s08.120712.epkg.Z key_w_fix | 6.1.6.9 IV22965s09.120926.epkg.Z key_w_fix | 6.1.7.4 IV22966s04.120702.epkg.Z key_w_fix | 6.1.7.5 IV22966s05.120921.epkg.Z key_w_fix | 7.1.0.6 IV22964s06.120712.epkg.Z key_w_fix | 7.1.0.7 IV22964s07.120918.epkg.Z key_w_fix | 7.1.1.4 IV22963s04.120702.epkg.Z key_w_fix | 7.1.1.5 IV22963s05.120814.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) ------------------------------------------------------------------- | 2.2.1.4-FP-25 SP-02 IV22966s04.120702.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 ------------------------------------------------------------------ | 6213e4a2c4d62996da32212aa66735e5b753dc72 IV22965s08.120712.epkg.Z | d033aa1c52dad75561f0b2bbce2cbea20df32da2 IV22965s09.120926.epkg.Z | 45ef7de4971baac44d014a299caa785f1a48d4d2 IV22966s04.120702.epkg.Z | 7662cccc3bd651adc519c5a7af885a4970c7486d IV22966s05.120921.epkg.Z | 727a88d4ef54fdacc181ef6f8a4d6713699e4da9 IV22964s06.120712.epkg.Z | 75837a5496d663d9af8ab1d3461b272bbb43cd79 IV22964s07.120918.epkg.Z | fb6801b541d00de2d7e51ae94469dd91c5ca1eda IV22963s04.120702.epkg.Z | c0866a71a98ce8ce470c3ec1b965a138045500ef IV22963s05.120814.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 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. openssl dgst -sha1 -verify AIX_PSIRT_pub.asc -signature file.asc.sig file.asc 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 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 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. 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: Note: Keywords labeled as KEY in this document are used for parsing purposes. 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.