CVE-2006-0619 in RTOS
Summary
by MITRE
Multiple stack-based buffer overflows in QNX Neutrino RTOS 6.3.0 allow local users to execute arbitrary code via long (1) ABLPATH or (2) ABLANG environment variables in the libAP library (libAp.so.2) or (3) a long PHOTON_PATH environment variable to the setitem function in the libph library.
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Analysis
by VulDB Data Team • 07/18/2018
The vulnerability identified as CVE-2006-0619 represents a critical security flaw in QNX Neutrino RTOS version 6.3.0 that stems from improper input validation in several core libraries. This issue manifests as multiple stack-based buffer overflows that can be exploited by local attackers to execute arbitrary code with the privileges of the affected process. The vulnerability specifically targets three distinct environment variables: ABLPATH, ABLANG, and PHOTON_PATH, each corresponding to different library functions within the QNX ecosystem. The affected libraries include libAP (libAp.so.2) and libph, where the buffer overflows occur during the processing of these environment variables through the setitem function in libph and the library loading mechanisms in libAP.
The technical implementation of this vulnerability exploits the fundamental principle of stack-based buffer overflows where insufficient bounds checking allows attackers to write data beyond the allocated memory buffer space. When the system processes environment variables exceeding the predetermined buffer size, the excess data overflows into adjacent memory locations, potentially corrupting the stack frame and overwriting return addresses or other critical execution data. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, and represents a classic example of improper input validation in system-level software. The vulnerability is particularly concerning because it requires only local user access to exploit, making it accessible through any user account with the ability to set environment variables within the system.
The operational impact of CVE-2006-0619 extends beyond simple code execution, as it can lead to complete system compromise and privilege escalation within the QNX RTOS environment. Since QNX Neutrino RTOS is commonly deployed in embedded systems, automotive applications, and industrial control systems, the exploitation of this vulnerability could result in serious security breaches affecting critical infrastructure. The attack vector through environment variable manipulation means that even seemingly benign processes could become entry points for malicious code execution, particularly in environments where multiple applications share the same runtime environment. The vulnerability affects the core system libraries, meaning that exploitation could potentially impact system stability and security across multiple applications that rely on these libraries.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements to prevent similar issues. The primary solution involves patching the affected QNX Neutrino RTOS version 6.3.0 with the appropriate security updates from the vendor, which would include proper bounds checking in the affected library functions. Additionally, system administrators should implement environment variable restrictions and monitoring to detect abnormal usage patterns that might indicate exploitation attempts. The implementation of stack canaries, address space layout randomization, and other exploit mitigation techniques can provide additional defense layers against exploitation attempts. Organizations using QNX systems should also consider implementing the principle of least privilege and regular security audits to minimize the attack surface and detect potential exploitation of similar vulnerabilities. This vulnerability demonstrates the importance of proper input validation in system-level libraries and aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation typically involves crafting malicious environment variable values to achieve code execution.