SGI InPerson inpview Environment Variable Input Validation Error Lets Local Users Gain Root Privileges
SecurityTracker Alert ID: 1012894|
SecurityTracker URL: http://securitytracker.com/id/1012894
(Links to External Site)
Date: Jan 14 2005
Execution of arbitrary code via local system, Root access via local system|
Exploit Included: Yes |
iDEFENSE reported a vulnerability in SGI's InPerson in the inpview application. A local user can obtain root privileges.|
The utility is configured with set user id (setuid) root user privileges. A local user can set the SUN_TTSESSION_CMD environment variable to a specially crafted command and then invoke inpview to cause the specified command to be executed with root privileges.
A demonstration exploit value is provided:
cp /bin/jsh /tmp/jsh;chmod 6755 /tmp/jsh;killall -9 inpview,
The vendor was notified on January 6, 2005.
iDEFENSE Labs discovered this flaw.
The original advisory is available at:
A local user can execute arbitrary commands with root privileges.|
No solution was available at the time of this entry. The vendor indicates that the product is no longer supported and no patch will be issued for this vulnerability.|
The report indicates that, as a workaround, you can remove the setuid bit from inpview:
chmod u-s /usr/lib/InPerson/inpview
Vendor URL: www.sgi.com/ (Links to External Site)
Input validation error|
|Underlying OS: UNIX (SGI/IRIX)|
|Underlying OS Comments: 6.5|
Source Message Contents
Subject: iDEFENSE Security Advisory 01.13.05: SGI IRIX inpview Design Error|
SGI IRIX inpview Design Error Vulnerability
iDEFENSE Security Advisory 01.13.05
January 13, 2005
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.
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.
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
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.
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:
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
iDEFENSE Labs is credited with this discovery.
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X. LEGAL NOTICES
Copyright (c) 2004 iDEFENSE, Inc.
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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
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