full-disclosure - iDefense Security Advisory 02.07.06: QNX Neutrino RTOS crttrap Arbitrary Library Loading Vulnerability

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Message-ID: <43E93026.8000204@idefense.com>
Date: Wed Feb  8 10:22:34 2006
From: vendor-disclosure at idefense.com (vendor-disclosure)
Subject: iDefense Security Advisory 02.07.06: QNX Neutrino
 RTOS crttrap Arbitrary Library Loading Vulnerability

QNX Neutrino RTOS crttrap Arbitrary Library Loading Vulnerability

iDefense Security Advisory 02.07.06
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=379
February 7, 2006

I. 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/

II. DESCRIPTION

Local exploitation of an arbitrary library loading vulnerability in QNX
Neutrino RTOS's (QNX) crttrap command allows attackers to gain root
privileges.

The vulnerability specifically exists because crttrap trusts the
LD_LIBRARY_PATH that a user supplies. A local attacker can create a
malicious replacement for certain libraries and cause the replacement
to be loaded in place of the original by manipulating the
LD_LIBRARY_PATH environment variable. The crttrap binary is installed
set user id root by default.

III. ANALYSIS

Successful exploitation provides local attackers with super-user
privileges on the affected system, allowing for complete control. The
system must be in text mode to exploit this vulnerability.

IV. DETECTION

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

V. WORKAROUND

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

VI. VENDOR RESPONSE

The vendor has not responded to communication regarding this issue.

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-1528 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

05/12/2005  Initial vendor notification
02/07/2006  Public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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http://labs.idefense.com

X. LEGAL NOTICES

Copyright ? 2006 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.