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Message-ID: <FB24803D1DF2A34FA59FC157B77C970503C8B08E@idserv04.idef.com> From: idlabs-advisories at idefense.com (idlabs-advisories@...fense.com) Subject: iDEFENSE Security Advisory 01.13.05: SGI IRIX inpview Design Error Vulnerability SGI IRIX inpview Design Error Vulnerability iDEFENSE Security Advisory 01.13.05 www.idefense.com/application/poi/display?id=182&type=vulnerabilities January 13, 2005 I. BACKGROUND The inpview program is a setuid root application that is included in the InPerson networked multimedia conferencing tool. InPerson networked multimedia conferencing tool is included in SGI IRIX. II. DESCRIPTION Local exploitation of a design error vulnerability in the inpview command included in multiple versions of Silicon Graphics Inc.'s IRIX could allow for arbitrary code execution as the root user. The vulnerability specifically exists due to the fact that inpview trusts the user environment and does not drop privileges. When the environment variable SUN_TTSESSION_CMD is something such as "cp /bin/jsh /tmp/jsh;chmod 6755 /tmp/jsh;killall -9 inpview," the chain of commands will be executed with root permissions, thus allowing a regular user to drop a setuid and setgid shell to /tmp. III. ANALYSIS All that is required to exploit this vulnerability is a local account and an open X display, which could be the attacker's home machine or another compromised system. Exploitation does not require any knowledge of application internals, making privilege escalation trivial, even for unskilled attackers. IV. DETECTION iDEFENSE has confirmed the existence of this vulnerability in SGI IRIX version 6.5.9 (feature) and 6.5.22 (maintenance). It is suspected that previous and later versions of both the feature and maintenance revisions of IRIX 6.5 are also vulnerable. V. WORKAROUND Only allow trusted users local access to security critical systems. Alternately, remove the setuid bit from inpview: chmod u-s /usr/lib/InPerson/inpview VI. VENDOR RESPONSE Support for the InPerson product did not extend beyond 02/2002 as noted in the following publication: techpubs.sgi.com/library/manuals/4000/007-4526-001/pdf/007-4526-001.pdf As a result, no patch will be issued for this vulnerability. VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 01/06/2005 Initial vendor notification 01/07/2005 Initial vendor response 01/13/2005 Public disclosure IX. CREDIT iDEFENSE Labs is credited with this discovery. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp X. LEGAL NOTICES Copyright (c) 2004 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@...fense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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