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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X. LEGAL NOTICES
Copyright © 2006 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
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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