CVE-2005-2725 in qnx rtos
Summary
by MITRE
the inputtrap utility in qnx rtos 6.1.0 6.3 and possibly earlier versions does not properly check permissions when the -t flag is specified which allows local users to read arbitrary files.
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Analysis
by VulDB Data Team • 01/01/2025
The vulnerability identified as CVE-2005-2725 affects the inputtrap utility within QNX RTOS versions 6.1.0 through 6.3, representing a critical permission bypass flaw that undermines the security model of the operating system. This issue specifically manifests when the utility is invoked with the -t flag, which enables a mode that should typically restrict access to sensitive system resources. The flaw stems from inadequate input validation and permission checking mechanisms within the utility's implementation, creating an exploitable condition that allows local attackers to circumvent normal access controls. The vulnerability is particularly concerning in real-time operating system environments where security boundaries are paramount for maintaining system integrity and preventing unauthorized access to critical data.
The technical implementation of this vulnerability involves the inputtrap utility's failure to properly validate user permissions when processing the -t flag parameter. When this flag is specified, the utility should enforce strict access controls to prevent unauthorized file access, but instead it accepts user input without adequate verification of the requesting process's privileges. This misconfiguration creates a path where local users can manipulate the utility's behavior to read arbitrary files from the system, effectively bypassing the normal file access controls that should protect sensitive system resources. The flaw operates at the kernel or system call level where permission checking should occur, but the implementation fails to properly enforce these checks, allowing privilege escalation through file system access manipulation.
From an operational perspective, this vulnerability presents significant risks to systems running affected QNX RTOS versions, particularly those deployed in industrial control systems, automotive applications, or other real-time environments where QNX is commonly utilized. Local users who can execute the inputtrap utility with the -t flag gain the ability to read any file on the system, potentially exposing sensitive configuration data, authentication credentials, system logs, or proprietary information. The impact extends beyond simple information disclosure as this access could enable further exploitation, including the potential to read system binaries, modify configuration files, or gather intelligence for more sophisticated attacks. The vulnerability affects the fundamental security model of the operating system by allowing local privilege escalation through file system access manipulation.
The vulnerability aligns with CWE-284, which describes improper access control mechanisms, and represents a classic example of inadequate privilege checking in system utilities. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques, specifically T1068, which involves exploiting legitimate credentials and privileges to gain higher-level access. The attack vector is particularly relevant for systems where local access is possible, as it requires minimal prerequisites beyond the ability to execute the inputtrap utility with the specific flag. Organizations should consider implementing process monitoring to detect unauthorized execution of the inputtrap utility and establish strict access controls over system utilities that handle sensitive operations. Additionally, the vulnerability underscores the importance of proper input validation and permission checking in system-level utilities, as highlighted in various security standards including NIST SP 800-53 and ISO 27001 controls for access control management.
Mitigation strategies should include immediate patching of affected QNX RTOS versions to address the permission checking flaw in the inputtrap utility. System administrators should also implement strict access controls over the utility itself, ensuring that only authorized users can execute it with the -t flag. Network segmentation and monitoring should be enhanced to detect unusual file access patterns that might indicate exploitation attempts. Regular security audits should verify that system utilities properly enforce access controls and that no unauthorized modifications exist in the utility's implementation. Organizations using QNX RTOS should also consider implementing privilege separation techniques and mandatory access controls to further reduce the impact of such vulnerabilities. The vulnerability serves as a reminder of the critical importance of proper input validation and permission checking in system utilities, particularly in real-time operating systems where security is fundamental to system reliability and integrity.