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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0568 -- [AIX] AIX lpd Buffer Overflow Vulnerability 27 July 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: lpd(3) Publisher: IBM Operating System: AIX 5.2, 5.3 Impact: Root Compromise Access: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 IBM SECURITY ADVISORY First Issued: Tue Jul 24 18:09:11 CDT 2007 =============================================================================== VULNERABILITY SUMMARY VULNERABILITY: AIX lpd Buffer Overflow Vulnerability PLATFORMS: AIX 5.2, 5.3 SOLUTION: Apply the APAR, interim fix or workaround as described below. THREAT: An attacker may run arbitrary code as root privileges. CERT VU Number: n/a CVE Number: n/a =============================================================================== DETAILED INFORMATION I. OVERVIEW The 'lpd' command offers an interface to the remote print daemon (lpd). II. DESCRIPTION A buffer overflow vulnerability exists in the 'lpd' command which may allow members of the printq group execute arbitrary code as root. III. IMPACT A local member of the printq may execute arbitrary code with root privileges. IV. PLATFORM VULNERABILITY ASSESSMENT To determine if your system is vulnerable, run the following command: # lslpp -l | grep bos.rte.printers The following filesets are vulnerable: AIX Level Lower Level Upper Level ------------------------------------------------- 5.2.0 5.2.0.85 5.2.0.105 5.3.0 5.3.0.40 5.3.0.60 V. SOLUTIONS A. APARS IBM provides the following fixes: AIX Level APAR number Availability -------------------------------------------------------------------- 5.2.0 IY98560 6/8/2007 (available) 5.3.0 IY98339 6/8/2007 (available) AIX Version 5 APARs can be downloaded from: http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html NOTE: Affected customers are urged to upgrade to the latest applicable Technology Level and Service Pack. B. INTERIM FIXES Interim fixes are available. The interim fix can be downloaded via ftp from: ftp://aix.software.ibm.com/aix/efixes/security/lpd_ifix.tar.Z This is a compressed tarball containing this advisory, interim fix packages and PGP signatures for each package. The interim fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels. AIX Release & Technology Level Interim fix --------------------------------------------------------------- 5200-08 IY98560_08.070724.epkg.Z 5200-09 IY98560_09.070724.epkg.Z 5200-10 IY98560_10.070724.epkg.Z 5300-04 IY98339_04.070724.epkg.Z 5300-05 IY98339_05.070724.epkg.Z 5300-06 IY98339_06.070724.epkg.Z IMPORTANT: If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding. These interim fixes have not been fully regression tested; thus, IBM does not warrant the fully correct functionality of the interim fix. Customers install the interim fix and operate the modified version of AIX at their own risk. Verify you have retrieved the fixes intact: The interim fixes below are named by using the technology level corresponding to the release that the fix applies to. The checksums below were generated using the "sum" and "md5sum" commands and are as follows: Filename sum md5sum ---------------------------------------------------------------------- IY98560_08.070724.epkg.Z 12757 77 7e1b951bc46d5294bf4a2001b2250c21 IY98560_09.070724.epkg.Z 64524 76 cfaa4502159825780678df5de0c084c6 IY98560_10.070724.epkg.Z 34514 75 edc31f4b258285bc4feea841d66da3d7 IY98339_04.070724.epkg.Z 01432 77 553ca3a541c28c65b23e99730b37e086 IY98339_05.070724.epkg.Z 57125 76 dd5742c0d70c556fa3ed15d8a2d9c898 IY98339_06.070724.epkg.Z 09692 77 39955f5773484160066243087561bd4d These sums should match exactly. The PGP signatures in the compressed tarball and on this advisory can also be used to verify the integrity of the various files they correspond to. If the sums or signatures cannot be confirmed, double check the command results and the download site address. If those are OK, contact IBM AIX Security at security-alert@austin.ibm.com and describe the discrepancy. C. INTERIM FIX INSTALLATION These packages use the new Interim Fix Management Solution to install and manage interim fixes. More information can be found at: http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html To preview an epkg interim fix installation execute the following command: # emgr -e ipkg_name -p # where ipkg_name is the name of the # interim fix package being previewed. To install an epkg interim fix package, execute the following command: # emgr -e ipkg_name -X # where ipkg_name is the name of the # interim fix package being installed. The "X" flag will expand any filesystems if required. VI. WORKAROUNDS A. OPTION 1 Customers running AIX 5.3.0 TL06 may install the bos.rte.security fileset and take advantage of the 'fpm' command to disable the setuid capabilities of 'capture'. The 'capture' command is disabled in the high level database. NOTE: This will disable functionality of the command for all users except root. NOTE: Some workarounds may disable function for some users. VII. OBTAINING FIXES AIX Version 5 APARs can be downloaded from: http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html Security related Interim Fixes can be downloaded from: ftp://aix.software.ibm.com/aix/efixes/security 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 send email to security-alert@austin.ibm.com with a subject of "get key". The key can also be downloaded from a PGP Public Key Server. The key id is 0x4265D862. 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. ACKNOWLEDGMENTS This vulnerability was discovered internal to IBM as part of its commitment to securing the AIX operating system. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (AIX) iD8DBQFGpotz0eNzcEJl2GIRAvJcAJ94csxeK73XXAS2ojn+Do8f9hzcAgCfXK7z fh5E/U6PfMZBqn/ShbeZNPA= =9v5C - -----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. 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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 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== 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 iQCVAwUBRqlagCh9+71yA2DNAQLp0AP/aKqjWOcVc77DvFbS4v1P4AGy6iWZqFu4 loswqeJAML956Mf+/VM10IYwNHqP6IM5HcKejnvGXoTdywv9T5360L6CRudlc0gF xeTu2tgXgMKItbklI/SidSs3SSE2pekCNiOOpSjt/KhTwH7HhPikIfueTnFl3nHu LHBZshU0yTk= =XLm7 -----END PGP SIGNATURE-----