CVE-2017-9711 in Snapdragon Automobile
Summary
by MITRE • 11/22/2024
Certain unprivileged processes are able to perform IOCTL calls.
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Analysis
by VulDB Data Team • 08/27/2026
The ability of unprivileged processes to execute Input/Output Control (IOCTL) commands against specific device drivers or system resources represents a significant architectural flaw in operating system security boundaries. Typically, the kernel maintains strict separation between user-mode applications and privileged kernel-space operations. This isolation is enforced through privilege checks that verify whether the calling process possesses sufficient access rights before allowing it to interact with sensitive hardware interfaces or internal subsystems. When this verification mechanism fails or is absent for certain IOCTL endpoints, it creates a pathway for unauthorized escalation of privileges or unintended system manipulation. The core technical flaw lies in the insufficient validation of caller permissions within the driver's dispatch routine, effectively bypassing standard access control lists and security descriptors that should restrict such interactions to administrators or specific service accounts.
From an operational perspective, this vulnerability allows any local user account on the affected system to issue commands directly to hardware components or kernel subsystems without requiring elevated credentials. This can lead to a variety of adverse outcomes depending on the nature of the exposed IOCTL interface. In many cases, it enables attackers to read sensitive data from protected memory regions, modify critical configuration parameters that control system behavior, or even execute arbitrary code within the context of the SYSTEM account if the driver improperly handles buffer inputs. The impact is particularly severe because local privilege escalation vulnerabilities are often leveraged as a secondary stage in attack chains following initial access through phishing, web application exploits, or other remote vectors. Once an attacker gains low-level user access, exploiting this flaw provides immediate root-equivalent privileges, effectively neutralizing the security perimeter of the host machine.
This type of vulnerability is commonly classified under CWE-269 Improper Privilege Management and often relates to CWE-787 Out-of-bounds Write if the IOCTL handler fails to validate buffer sizes correctly before copying data into kernel space. In terms of adversary tactics, this aligns with MITRE ATT&CK technique T1055 Process Injection or T1068 Exploitation for Privilege Escalation, where attackers leverage local software vulnerabilities to gain higher-level access. The exploitation typically involves crafting a malicious application that opens the vulnerable device handle and sends specifically formatted IOCTL requests designed to trigger the flawed logic within the driver code. Defense mechanisms such as mandatory integrity control (MIC) or Windows Defender Application Control may offer some mitigation by restricting which processes can load unsigned drivers, but they do not address the logical flaw in permission checking once a valid handle is obtained through legitimate means like opening standard device paths that are world-readable.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary solution involves applying vendor-provided patches that correct the IOCTL dispatch logic to enforce strict privilege checks before processing any requests from user-mode applications. Administrators should ensure that all system updates are applied promptly, particularly those addressing kernel driver vulnerabilities. In environments where patching is not immediately feasible, restricting access to device files via file system permissions can provide a temporary workaround by ensuring only authorized groups have read/write rights to the specific device node associated with the vulnerable IOCTL interface. Additionally, implementing application whitelisting policies and monitoring for unusual process behavior involving direct hardware interactions can help detect exploitation attempts in real-time. Long-term resilience requires adopting secure coding practices during driver development, including rigorous static analysis and fuzz testing of IOCTL handlers to ensure that all input parameters are validated against expected bounds and privilege levels before being processed by the kernel.