-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 IBM SECURITY ADVISORY First Issued: Tue Mar 11 10:01:36 CDT 2008 =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: AIX lsmcode environment variable error PLATFORMS: AIX 5.2, 5.3, 6.1 SOLUTION: Apply the fix or workaround as described below. THREAT: A local attacker may execute arbitrary code. CVE Number: n/a Reboot required? NO Workarounds? YES Protected by FPM? YES (high, medium, or low) Protected by SED? NO =============================================================================== DETAILED INFORMATION I. DESCRIPTION The lsmcode command contains an environment variable handling error. A local attacker may exploit this error to execute arbitrary code with root privileges because the command is setuid root. The following files are vulnerable: /usr/sbin/lsmcode II. PLATFORM VULNERABILITY ASSESSMENT To determine if your system is vulnerable, execute the following command: lslpp -L bos.diag.util The following fileset levels are vulnerable: AIX Fileset Lower Level Upper Level ----------------------------------------------------------- bos.diag.util 5.2.0.85 5.2.0.85 bos.diag.util 5.2.0.95 5.2.0.96 bos.diag.util 5.2.0.105 5.2.0.107 bos.diag.util 5.3.0.50 5.3.0.51 bos.diag.util 5.3.0.60 5.3.0.64 bos.diag.util 5.3.7.0 5.3.7.0 bos.diag.util 6.1.0.0 6.1.0.0 III. SOLUTIONS A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR number Availability --------------------------------------------------- 5.2.0 IZ15276 Now 5.3.0 IZ15100 Now 5.3.7 IZ15057 Now 6.1.0 IZ15277 Now Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IZ15276 http://www.ibm.com/support/docview.wss?uid=isg1IZ15100 http://www.ibm.com/support/docview.wss?uid=isg1IZ15057 http://www.ibm.com/support/docview.wss?uid=isg1IZ15277 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/lsmcode_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 Fix (*.U) and Interim Fix (*.Z) ------------------------------------------------------------------- 5.2.0 TL8 IZ15276_08.080305.epkg.Z 5.2.0 TL9 IZ15276_09.080305.epkg.Z 5.2.0 TL10 bos.diag.util.5.2.0.108.U 5.3.0 TL5 IZ15100_05.080305.epkg.Z 5.3.0 TL6 bos.diag.util.5.3.0.65.U 5.3.0 TL7 bos.diag.util.5.3.7.1.U 6.1.0 bos.diag.util.6.1.0.1.U To extract the fixes from the tar file: tar xvf lsmcode_fix.tar cd lsmcode_fix Verify you have retrieved the fixes intact: The checksums below were generated using the "sum", "cksum", "csum -h MD5" (md5sum), and "csum -h SHA1" (sha1sum) commands and are as follows: sum filename ------------------------------------- 36297 512 bos.diag.util.5.2.0.108.U 00209 419 bos.diag.util.5.3.0.65.U 23450 552 bos.diag.util.5.3.7.1.U 36043 19 bos.diag.util.6.1.0.1.U 37984 10 IZ15100_05.080305.epkg.Z 41110 9 IZ15276_08.080305.epkg.Z 56487 10 IZ15276_09.080305.epkg.Z cksum filename ------------------------------------------- 2879294144 524288 bos.diag.util.5.2.0.108.U 353199196 429056 bos.diag.util.5.3.0.65.U 1908936478 565248 bos.diag.util.5.3.7.1.U 45177424 19456 bos.diag.util.6.1.0.1.U 3796873270 9580 IZ15100_05.080305.epkg.Z 3435249083 9125 IZ15276_08.080305.epkg.Z 2615257769 9567 IZ15276_09.080305.epkg.Z csum -h MD5 (md5sum) filename ----------------------------------------------------------- ca29fd06621ce8100f10f66df37f6d2f bos.diag.util.5.2.0.108.U 9aafda7247210d664c27face27896b72 bos.diag.util.5.3.0.65.U 6827187134749ad24b562f7a302a9cab bos.diag.util.5.3.7.1.U ae0c2d2d87b5f73d4f5e24c6fe47e083 bos.diag.util.6.1.0.1.U 5b9add727a4656f65db8a17c5bf79ace IZ15100_05.080305.epkg.Z 86f0f7f18636875e90287623ce88b179 IZ15276_08.080305.epkg.Z 42711668127921030cd22bf763addc63 IZ15276_09.080305.epkg.Z csum -h SHA1 (sha1sum) filename ------------------------------------------------------------------- 399b55dd40ca366b730392262ae9d7cfce21db63 bos.diag.util.5.2.0.108.U 1f55f43f6fbf72e6100fc5bed9b21933ba29358a bos.diag.util.5.3.0.65.U f14e275679db28b701e3729cf9421a23c72595da bos.diag.util.5.3.7.1.U 9b5d03c75513f14d02df40754c218a3d197c464a bos.diag.util.6.1.0.1.U 76443b3c0d66fac27a990486615ce5abe8827489 IZ15100_05.080305.epkg.Z 7188cbac3c4f7de2ab2c5244a7c148e1aaee43eb IZ15276_08.080305.epkg.Z 1d78437ab48208b56ef04857d1ca572819c735e7 IZ15276_09.080305.epkg.Z To verify the sums, use the text of this advisory as input to csum, md5sum, or sha1sum. For example: csum -h SHA1 -i Advisory.asc md5sum -c 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. IV. WORKAROUNDS There are two workarounds available. A. OPTION 1 Change the permissions of these commands to remove the setuid bit using the following commands: chmod 500 /usr/sbin/lsmcode NOTE: chmod will disable functionality of these commands for all users except root. B. OPTION 2 (AIX 6.1, AIX 5.3 TL6 and TL7) Use the File Permissions Manager (fpm) command to manage setuid and setgid programs. fpm documentation can be found in the AIX 6 Security Redbook at: http://www.redbooks.ibm.com/abstracts/sg247430.html An fpm level of high, medium, or low will remove the setuid bit from the affected commands. For example: fpm -l high -p # to preview changes fpm -l high # to execute changes NOTE: Please review the documentation before execution. fpm will disable functionality of multiple commands for all users except root. V. 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. VI. 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: 0xA6A36CCC 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. VII. ACKNOWLEDGMENTS IBM discovered and fixed this vulnerability as part of its commitment to secure the AIX operating system. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (AIX) iD8DBQFH1sBc8lficKajbMwRAqylAKCeZGwD5r6zh6bWzpOn+xwn2+f1FwCeO9GX BIgZDGKj1Fuu4EyX60TLOUc= =/TSu -----END PGP SIGNATURE-----