QNX Neutrino RTOS su Command Buffer Overflow
iDefense Security Advisory 02.07.06 http://www.idefense.com/intelligence/vulnerabilities/display.php?id=385 February 7, 2006
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:
Local exploitation of a buffer overflow in QNX Neutrino RTOS's (QNX) 'su' 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 'su'. The 'su' command is intended for running commands under a substitute user or group id. A string larger then approximately 4000 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.
Any authenticated local attacker can exploit this vulnerability to gain super-user (root) privileges on the affected system.
iDefense has confirmed the existence of these vulnerabilities in QNX Neutrino RTOS version 6.2.0. Earlier versions are suspected to be susceptible to exploitation as well.
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
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.
VIII. DISCLOSURE TIMELINE
06/04/2004 Initial vendor notification 02/07/2006 Public disclosure
Texonet (www.texonet.com) is credited with this discovery.
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X. LEGAL NOTICES
Copyright © 2006 iDefense, Inc.
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