// back

QNX Neutrino RTOS phgrafx Command Buffer Overflow

02.07.06

BACKGROUND

QNX Software Systems Ltd.'s Neutrino RTOS (QNX) is a real-time operating
system designed for use in embedded systems. More information is
available at:

http://www.qnx.com/products/rtos/

DESCRIPTION

Local exploitation of a buffer overflow in QNX Neutrino RTOS's (QNX)
'phgrafx' command allows attackers to gain root privileges.

The problem specifically exists in the parsing of a long string passed
as the first argument to the set user id (setuid) binary 'phgrafx'. A
string larger than approximately 1,000 bytes causes a stack overflow
directly overwriting the stored return address and allowing an attacker
to seize CPU control and eventually execute arbitrary code under root
privileges.

ANALYSIS

Successful exploitation provides local attackers with super-user
privileges on the affected system allowing for complete control.

DETECTION

iDefense has confirmed the existence of these vulnerabilities in QNX
Neutrino RTOS version 6.2.1. Earlier versions are suspected to be
susceptible to exploitation as well.

WORKAROUND

Clear the set user id or execute bits from the affected binary or remove
it entirely.

VENDOR RESPONSE

This issue has been corrected in QNX Neutrino 6.3.0 Service Pack 2.

QNX customers can download this patch from

  http://www.qnx.com/account/login.html

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.

DISCLOSURE TIMELINE

08/24/2004 Initial vendor notification
02/07/2006 Public disclosure

CREDIT

Knud Hojgaard (http://kokanin.dtors.net) is credited with this
discovery.

Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp

Free tools, research and upcoming events
http://labs.idefense.com

LEGAL NOTICES

Copyright © 2006 Verisign, 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.