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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2005.0140 -- IBM Security Advisory Buffer overflow vulnerability in ipl_varyon 11 February 2005 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ipl_varyon Publisher: IBM Operating System: AIX 5.1, 5.2 and 5.3 Impact: Root Compromise Execute Arbitrary Code/Commands Access: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 IBM SECURITY ADVISORY First Issued: Wed Feb 9 15:16:37 CST 2005 ========================================================================= VULNERABILITY SUMMARY VULNERABILITY: A buffer overflow in the ipl_varyon command may allow a local user in the system group to gain root privileges. PLATFORMS: AIX 5.1, 5.2 and 5.3. SOLUTION: Apply the workaround, efix or APAR as described below. THREAT: A local user in the system group may gain root privileges. CERT VU Number: N/A CVE Number: N/A ========================================================================= DETAILED INFORMATION I. Description =============== A buffer overflow vulnerability was discovered in the ipl_varyon command. This command is used to varyon the root volume group during the boot process. A user in the system group may exploit this vulnerability to gain root privileges. The command affected by this issue ships as part of the bos.rte.lvm fileset. To determine if this fileset is installed, execute the following command: # lslpp -L lslpp -L bos.rte.lvm If the fileset is installed it will be listed along with its version information, state, type and a description. II. Impact ========== A local user in the system group may gain root privileges. III. Solutions =============== A. Official Fix IBM provides the following fixes: APAR number for AIX 5.1.0: IY67812 (available approx. 03/23/05) APAR number for AIX 5.2.0: IY67750 (available approx. 04/15/05) APAR number for AIX 5.3.0: IY66933 (available approx. 04/15/05) NOTE: Affected customers are urged to upgrade to 5.1.0, 5.2.0 or 5.3.0 at the latest maintenance level. B. Emergency Fix Efixes are available for AIX 5.1.0, 5.2.0 and 5.3.0. The efixes can be downloaded via ftp from: ftp://aix.software.ibm.com/aix/efixes/security/ipl_varyon_efix.tar.Z ipl_varyon_efix.tar.Z is a compressed tarball containing this advisory, three efix packages cleartext PGP signatures for each efix package. Verify you have retrieved the efixes intact: - - -------------------------------------------- The checksums below were generated using the "sum" and "md5sum" commands and are as follows: Filename sum md5 ===================================================================== IY67812.050209.epkg.Z 52730 11 df9cdc3bced511a2bc426edc487aec6e IY67750.050209.epkg.Z 05037 11 d3d2e7cf6e05a092b3b292cffdd2b53c IY66933.050209.epkg.Z 03588 12 1764bce34b7c1f47a957da5f6a9c3004 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 email@example.com and describe the discrepancy. IMPORTANT: If possible, it is recommended that a mksysb backup of the system is created. Verify it is both bootable, and readable before proceeding. These efixes have not been fully regression tested; thus, IBM does not warrant the fully correct functioning of the efix. Customers install the efix and operate the modified version of AIX at their own risk. Efix Installation Instructions: - - ------------------------------- These packages use the new Emergency Fix Management Solution to install and manage efixes. More information can be found at: http://techsupport.services.ibm.com/server/aix.efixmgmt To preview an epkg efix installation execute the following command: # emgr -e epkg_name -p # where epkg_name is the name of the # efix package being previewed. To install an epkg efix package, execute the following command: # emgr -e epkg_name -X # where epkg_name is the name of the # efix package being installed. The "X" flag will expand any filesystems if required. C. Workaround Setting the file mode bits to 500 will allow only the root user to execute the netpmon command. This can be done by executing the following command as root: # chmod 500 /usr/bin/netpmon Verify that the file mode bits have been changed to 500: # ls -la /usr/bin/netpmon - - -r-x------ 1 root system 83454 2003-04-09 18:48 /usr/bin/netpmon IV. Obtaining Fixes =================== AIX Version 5 APARs can be downloaded from: http://www-1.ibm.com/servers/eserver/support/pseries/aixfixes.html Security related Emergency Fixes can be downloaded from: ftp://aix.software.ibm.com/aix/efixes/security V. Acknowledgments ==================== This vulnerability was reported by iDEFENSE. VI. Contact Information ======================== If you would like to receive AIX Security Advisories via email, please visit: https://techsupport.services.ibm.com/server/pseries.subscriptionSvcs Comments regarding the content of this announcement can be directed to: firstname.lastname@example.org To request the PGP public key that can be used to communicate securely with the AIX Security Team send email to email@example.com with a subject of "get key". The key can also be downloaded from a PGP Public Key Server. The key id is 0x9391C1F2. 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. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (MingW32) iD8DBQFCCp4JxwSSvpORwfIRAggsAJ0TTQOsoNXNbqrQkBHZ6OmiJzYyRQCbBksn GH7fwvFVJmpz9FWbqvziteg= =/3Z7 - -----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 firstname.lastname@example.org 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. 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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: email@example.com 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 iQCVAwUBQgwqCih9+71yA2DNAQLPxQP+Oauru6j284KYyokEIMu4l8hD3pDqNK8J bCiMRTZqG2rJ+bbYgdFPLkXyvoF/FhEYeK6ztXrNn5BoPbP9qheUxwZ1rpDt65K0 WopHa755psOBoHPsqO1gWon7//ltvhjFTBr//NAruxijSOFWW2j3NzVGVqXhlL61 nD+n/xuNLk0= =3vPE -----END PGP SIGNATURE-----