CVE-2004-1391 in RTOS
Summary
by MITRE
Untrusted execution path vulnerability in the PPPoE daemon (PPPoEd) in QNX RTP 6.1 allows local users to execute arbitrary programs by modifying the PATH environment variable to point to a malicious mount program.
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Analysis
by VulDB Data Team • 11/21/2024
The vulnerability identified as CVE-2004-1391 represents a critical security flaw within the PPPoE daemon implementation in QNX RTP 6.1 operating system. This issue manifests as an untrusted execution path vulnerability that specifically targets the PPPoEd service responsible for handling Point-to-Point Protocol over Ethernet connections. The vulnerability stems from the daemon's improper handling of environment variables during the execution of system commands, creating a pathway for privilege escalation and arbitrary code execution.
The technical flaw occurs when the PPPoEd daemon executes external programs without properly sanitizing the PATH environment variable. Local attackers can exploit this weakness by manipulating the PATH variable to redirect execution to a maliciously crafted mount program located in a directory that takes precedence over legitimate system binaries. This manipulation allows the attacker to execute arbitrary code with the privileges of the PPPoEd daemon, which typically runs with elevated permissions. The vulnerability is classified under CWE-78 as a "Improper Neutralization of Special Elements used in a Command" and aligns with ATT&CK technique T1068 which covers "Exploitation for Privilege Escalation."
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a persistent foothold within the system. Since PPPoEd is typically a critical service for network connectivity, compromising it can lead to complete system compromise and persistent access. The vulnerability affects systems running QNX RTP 6.1 where PPPoE functionality is enabled, potentially exposing network infrastructure devices, embedded systems, and IoT devices that rely on this operating system. Attackers can leverage this vulnerability to establish backdoors, exfiltrate data, or use the compromised system as a launch point for further attacks within the network.
Mitigation strategies for CVE-2004-1391 should focus on both immediate remediation and long-term security hardening measures. The most effective immediate solution involves patching the QNX RTP 6.1 system with the vendor-provided security update that properly sanitizes environment variables before executing external programs. Organizations should also implement proper environment variable management by explicitly setting PATH to only include trusted directories and avoiding the inclusion of user-writable paths. Additionally, system administrators should ensure that the PPPoEd daemon runs with the minimal required privileges and that all system binaries are properly secured with appropriate file permissions. Network segmentation and monitoring of PPPoE traffic can help detect exploitation attempts, while regular security audits should verify that no unauthorized modifications exist in the system's PATH environment variables. This vulnerability demonstrates the critical importance of secure coding practices and environment variable handling in system services that execute external programs, particularly those with elevated privileges.