CVE-2017-3891 in QNX Software Development Platform
Summary
by MITRE
In BlackBerry QNX Software Development Platform (SDP) 6.6.0, an elevation of privilege vulnerability in the default configuration of the QNX SDP with QNet enabled on networks comprising two or more QNet nodes could allow an attacker to access local and remote files or take ownership of files on other QNX nodes regardless of permissions by executing commands targeting arbitrary nodes from a secondary QNX 6.6.0 QNet node.
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Analysis
by VulDB Data Team • 08/22/2025
The vulnerability identified as CVE-2017-3891 represents a critical elevation of privilege flaw within the BlackBerry QNX Software Development Platform version 6.6.0, specifically affecting systems configured with QNet networking capabilities. This security weakness manifests in environments where multiple QNet nodes exist within the same network infrastructure, creating a significant attack surface that adversaries can exploit to gain unauthorized access to system resources. The vulnerability stems from improper access controls within the default QNet configuration, which fails to adequately enforce security boundaries between networked QNX nodes, allowing malicious actors to bypass normal permission structures and execute arbitrary commands across the network.
The technical implementation of this vulnerability exploits the inherent trust relationships established between QNet nodes in the default configuration. When two or more QNX nodes are connected within the same network segment, the system's default security model permits communication without sufficient authentication or authorization checks. This flaw enables an attacker positioned on one QNX node to execute commands against other nodes within the same QNet, effectively allowing file access and ownership manipulation regardless of standard permission settings. The vulnerability specifically targets the QNet networking component which facilitates inter-node communication and resource sharing, making it a critical component of the system's attack surface. The flaw operates at the network protocol level where QNet's default configuration fails to implement proper access control mechanisms between nodes, creating a path for privilege escalation through network-based attacks.
The operational impact of CVE-2017-3891 extends beyond simple unauthorized access to encompass complete compromise of distributed QNX systems. Attackers can leverage this vulnerability to gain persistent access to multiple nodes within the network, potentially leading to complete system takeover and data exfiltration. The implications are particularly severe in industrial control systems, automotive applications, and embedded environments where QNX is commonly deployed, as these systems often operate without traditional network security controls. The vulnerability affects systems that rely on QNet for inter-process communication and resource sharing, making it particularly dangerous in environments where multiple QNX devices are interconnected. Organizations using QNX SDP 6.6.0 in production environments face significant risk of unauthorized system manipulation, file corruption, and potential safety hazards in critical infrastructure applications.
Mitigation strategies for this vulnerability require immediate implementation of network segmentation and access control measures to prevent unauthorized communication between QNet nodes. System administrators should disable QNet functionality when not required or implement proper authentication mechanisms to validate node-to-node communications. The recommended approach includes configuring explicit access control lists and implementing network monitoring to detect unauthorized QNet traffic patterns. Organizations should also consider applying the latest security patches provided by BlackBerry QNX and implementing network-level security controls such as firewalls to restrict QNet communications. This vulnerability aligns with CWE-284, which addresses improper access control, and maps to ATT&CK techniques related to privilege escalation and lateral movement within networked environments. The security community should treat this as a high-priority vulnerability requiring immediate remediation, particularly in environments where QNX systems are deployed in critical infrastructure applications where security is paramount.