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Re: AIX 5.1/5.2/5.3 local root exploits (paginit issue)

cees-bart <ceesb () cs ru nl> wrote on 12/20/2004 05:10:41 AM:

2) the second is a classical stack overflow in a tool called paginit.

Note from the advisory below that AIX 5.1 is not affected by this issue.-----BEGIN PGP SIGNED MESSAGE-----Hash: SHA1IBM SECURITY ADVISORYFirst Issued: Mon Dec 20 12:57:11 CST 2004===========================================================================                           VULNERABILITY SUMMARYVULNERABILITY:      Buffer overflow vulnerability in paginit command                    allows local users to gain root privileges.PLATFORMS:          AIX 5.2 and 5.3.SOLUTION:           Apply the workaround or APARs as described below.THREAT:             A local user can gain root privileges.CERT VU Number:     N/ACVE Number:         N/A===========================================================================                           DETAILED INFORMATIONI.  Description===============A vulnerability was discovered in the paginit command that allows a localuser to gain root privileges. Exploits for this vulnerability are publiclyavailable.The command affected by this issue ships as part of the bos.rte.securityfileset. This fileset is installed as part of the Base Operating SystemInstallation.II. Impact==========Any local user can exploit this buffer overflow vulnerability to gain rootprivileges.III.  Solutions===============A. Official FixIBM provides the following fixes:      APAR number for AIX 5.2.0: IY64522 (available)      APAR number for AIX 5.3.0: IY64312 (available)NOTE: Affected customers are urged to upgrade to 5.2.0 or 5.3.0 at thelatest maintenance level. Although a related AIX 5.1 APAR is available,this issue is not exploitable on AIX 5.1 since the paginit commandis not available on 5.1.B. WorkaroundSetting the file mode bits to 500 will allow only the root user to executethe paginit command. This can be done by executing the following command asroot:# chmod 500 /usr/bin/paginitVerify that the file mode bits have been changed to 500:# ls -la /usr/bin/paginit- -r-x------  1 root security 7354 2002-09-15 20:39 /usr/bin/paginitIV. Obtaining Fixes===================AIX Version 5 APARs can be downloaded from the eServer pSeries Fix Centralweb site:http://www-912.ibm.com/eserver/support/fixes/fcgui.jspSecurity related Emergency Fixes can be downloaded from:ftp://aix.software.ibm.com/aix/efixes/securityV.  Contact Information=======================If you would like to receive AIX Security Advisories via email, please visit:https://techsupport.services.ibm.com/server/pseries.subscriptionSvcsComments regarding the content of this announcement can be directed to:     security-alert () austin ibm comTo request the PGP public key that can be used to communicate securelywith the AIX Security Team send email to security-alert () austin ibm comwith a subject of "get key". The key can also be downloaded from aPGP 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 BusinessMachines Corporation. All other trademarks are property of theirrespective holders.-----BEGIN PGP SIGNATURE-----Version: GnuPG v1.2.4 (MingW32)iD8DBQFBx3g8xwSSvpORwfIRAlAhAJ9b9z6NyUOMWt5hjWQyRWFTuxlVowCfSDGvJnduPgdIMwORnJAKHP9Nenw==6/oH-----END PGP SIGNATURE-----

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• Re: AIX 5.1/5.2/5.3 local root exploits (paginit issue)Shiva Persaud (Dec 21)