InPerson Security vulnerability (local root exploit)

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InPerson Security vulnerability (local root exploit)

Unread postby dexter1 » Mon Jan 17, 2005 3:16 am

Via Rhoenie and Whizzman i received this:

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Date:  Thu, 13 Jan 2005 17:39:50 -0500
From:  idlabs-advisories@idefense.com
Subject:  iDEFENSE Security Advisory 01.13.05: SGI IRIX inpview Design Error

 
 
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@idefense.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.

Check out the link at http://www.securitytracker.com/alerts/2 ... 12894.html

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