Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2004.0813 -- IBM Security Advisory Untrusted path vulnerability in the diag script 22 December 2004 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: diag Publisher: IBM Operating System: AIX Impact: Root Compromise Access: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 IBM SECURITY ADVISORY First Issued: Mon Dec 20 10:44:36 CST 2004 =========================================================================== VULNERABILITY SUMMARY VULNERABILITY: An untrusted path vulnerability in the diag script allows local users to execute arbitrary code if invoked via a suid root application. PLATFORMS: AIX 5.1, 5.2 and 5.3. SOLUTION: Apply the workaround or APARs as described below. THREAT: A local user can execute arbitrary code with root privileges. CERT VU Number: N/A CVE Number: N/A =========================================================================== DETAILED INFORMATION I. Description =============== A vulnerability was discovered in the diag script that may allow any user to execute arbitrary code with root privileges. The diag script is used to perform various diagnostic functions. Exploits for this vulnerability are publicly available. The script affected by this issue ships as part of the bos.rte.diag fileset. To determine if this fileset is installed, execute the following command: # lslpp -L bos.rte.diag If the fileset is installed it will be listed along with its version information, state, type and a description. The diag script is only executable by the root user or users in the system group; an unprivileged user cannot exploit this vulnerability by executing the diag script. However, various suid root AIX commands invoke the diag script with root privileges. Unprivileged users can exploit this vulnerability via these commands. These commands include lsmcode, invscout, invscoutd and diag_exec. The following describes how to check for the filesets containing these commands: To determine if Inventory Scout (invscout and invscoutd) is installed, execute the following command: # lslpp -L invscout.rte To determine if diag_exec is installed, execute the following command: # lslpp -L bos.rte.diag To determine if lsmcode is installed, execute the following command: # lslpp -L bos.diag.util If the fileset is installed it will be listed along with its version information, state, type and a description. II. Impact ========== Local users can execute arbitrary commands with root privileges. III. Solutions =============== A. Official Fix IBM provides the following fixes: APAR number for AIX 5.1.0: IY64389 (available) APAR number for AIX 5.2.0: IY64523 (available) APAR number for AIX 5.3.0: IY64277 (available) NOTE: Affected customers are urged to upgrade to 5.1.0, 5.2.0 or 5.3.0 at the latest maintenance level. B. Workaround Setting the file mode bits for lsmcode, invscout, invscoutd and diag_exec to 500 will allow only the root user to execute the these commands. This can be done by executing the following commands as root: # chmod 500 /usr/sbin/lsmcode # chmod 500 /usr/sbin/invscout # chmod 500 /usr/sbin/invscoutd # chmod 500 /usr/sbin/diag_exec Verify that the file mode bits have been changed to 500: # ls -la /usr/sbin/lsmcode - - -r-x------ 1 root system 10014 Sep 15 2002 /usr/sbin/lsmcode # ls -la /usr/sbin/invscout - - -r-x------ 1 root system 465216 Oct 13 20:58 /usr/sbin/invscout # ls -la /usr/sbin/invscoutd - - -r-x------ 1 root system 525131 Oct 13 20:58 /usr/sbin/invscoutd # ls -la /usr/sbin/diag_exec - - -r-x------ 1 root system 2796 Sep 15 2002 /usr/sbin/diag_exec IV. Obtaining Fixes =================== AIX Version 5 APARs can be downloaded from the eServer pSeries Fix Central web site: http://www-912.ibm.com/eserver/support/fixes/fcgui.jsp Security related Emergency Fixes can be downloaded from: ftp://aix.software.ibm.com/aix/efixes/security V. 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: 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 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 v1.2.4 (MingW32) iD8DBQFBx3k3xwSSvpORwfIRAk0IAJoCzN4zXLYDuiDyo3HSGuUMiM1KcACZAUJq 74UDtrgFh1l8FLkU8xpxXs0= =xQQM - -----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. 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: 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 iQCVAwUBQckWIyh9+71yA2DNAQIyZgP/Wc5V1KZ3/sNXQn7x7QNzzZgeWSC4YTw8 iGZVg4dyz27ohnVqFNwvw324yAuQAX0ObRT17RIykttcEh4LUQ6BAoyPJ4iqEDPu 05OYEd12QCvJbF9Nu4K61BSA5CqC6InJ+V7beAreJOyIt6bnpLm5Z5AZf+z1mVDJ 7d5VQjUe9A0= =noIk -----END PGP SIGNATURE-----