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» ESB-2005.0141 -- IBM Security Advisory -- Arbitrary ...
ESB-2005.0141 -- IBM Security Advisory -- Arbitrary file read vulnerability in lspath
11 February 2005
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2005.0141 -- IBM Security Advisory Arbitrary file read vulnerability in lspath 11 February 2005 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: lspath Publisher: IBM Operating System: AIX 5.2 and 5.3 Impact: Read-only Data Access 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 vulnerability in the lspath command allows any local user to read from any file. PLATFORMS: AIX 5.2 and 5.3. SOLUTION: Apply the workaround, efix or APAR as described below. THREAT: A local user can read the first work of any file. CERT VU Number: N/A CVE Number: N/A ========================================================================= DETAILED INFORMATION I. Description =============== A vulnerability was discovered in the lspath command. This command displays information about paths to an MultiPath I/O (MPIO) capable device. Any local user may exploit this vulnerability to read any file up to the first whitespace (tab, space or newline character) in that file. Please note that this issue cannot be exploited to read an arbitrary file in entirety nor can it be exploited to write to a file. The command affected by this issue ships as part of the bos.rte.methods fileset. To determine if this fileset is installed, execute the following command: # lslpp -L bos.rte.methods If the fileset is installed it will be listed along with its version information, state, type and a description. II. Impact ========== A local user may read an arbitrary file up to the first whitespace. This vulnerability may be exploited to access information that a user would not otherwise be able to read. III. Solutions =============== A. Official Fix IBM provides the following fixes: APAR number for AIX 5.2.0: IY67457 (available approx. 04/15/05) APAR number for AIX 5.3.0: IY67655 (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/lspath_efix.tar.Z lspath_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 ===================================================================== IY67457.050209.epkg.Z 09497 36 a4dde2b6e62efce8fae2a1fcd861ca07 IY67655.050209.epkg.Z 21676 37 76b49f71ac3a55a40412fd117f98df92 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 lspath command. This can be done by executing the following command as root: # chmod 500 /usr/sbin/lspath Verify that the file mode bits have been changed to 500: # ls -la /usr/sbin/lspath - - -r-x------ 1 root system 63894 2003-06-23 13:59 /usr/sbin/lspath 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) iD8DBQFCCpiKxwSSvpORwfIRArdhAJoCfMoHOGyb4myThNLX7HWXKYjh/wCfaMcr 7ILVJOl7vnup4S2ODj3OrG8= =v5MC - -----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. 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 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 iQCVAwUBQgwsvSh9+71yA2DNAQIEXAP/Qm2E2lKcBKg1O3dmT3OO0SwPLUCAq9UZ ldHGRGITKmyAm8Yq9IkLk5xbVzp3slXqL9TPYsmrWmbqPtlrwG1PcgAnF7AH6lLM eDnrJHcYe8YDkCQ2LgYf9P0F5Fb8RdP3Nor/dr3fs02MG47KQveSNhHc4OYTmpp4 QnfR/Sa8hpU= =1VDL -----END PGP SIGNATURE-----
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