QNX Neutrino RTOS phfont Race Condition Vulnerability
iDefense Security Advisory 02.07.06 http://www.idefense.com/intelligence/vulnerabilities/display.php?id=383 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 race condition vulnerability in QNX Neutrino RTOS's (QNX) phfont command allows attackers to gain root privileges.
QNX Neutrino RTOS is a real-time operating system designed for use in embedded systems. The problem specifically exists because phfont spawns another command, phfontphf, without proper sanity checking. A local attacker can create a malicious replacement for this command and cause it to be executed in place of the original by manipulating the PHFONT and PHOTON2_PATH environment variables. phfont is installed set user id root by default.
Successful exploitation provides local attackers with super user privileges on the affected system, allowing for complete control.
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.
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
09/29/2004 Initial vendor notification 02/07/2006 Public disclosure
Knud Hojgaard (http://kokanin.dtors.net) is credited with this discovery.
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X. LEGAL NOTICES
Copyright © 2006 iDefense, Inc.
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