CVE-2016-0171 in Windows
Summary
by MITRE
The kernel-mode drivers in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 allow local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability," a different vulnerability than CVE-2016-0173, CVE-2016-0174, and CVE-2016-0196.
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Analysis
by VulDB Data Team • 03/18/2025
The vulnerability identified as CVE-2016-0171 represents a critical privilege escalation flaw within the Windows kernel-mode drivers, specifically affecting multiple versions of the Microsoft Windows operating system including Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511. This vulnerability operates at the kernel level and is classified as a Win32k Elevation of Privilege Vulnerability, distinguishing it from related vulnerabilities such as CVE-2016-0173, CVE-2016-0174, and CVE-2016-0196. The flaw resides in the Windows kernel-mode drivers that handle graphics and user interface components, specifically within the win32k.sys file which manages the graphical subsystem and user input processing.
The technical exploitation of this vulnerability occurs through a crafted application that leverages improper input validation within the kernel-mode driver code. Attackers can manipulate the system by submitting malicious input to the vulnerable driver functions, which then fail to properly validate or sanitize the data before processing. This leads to a situation where a local user with standard privileges can execute arbitrary code with kernel-level privileges, effectively bypassing the operating system's security model. The vulnerability stems from insufficient bounds checking and memory management practices within the graphics subsystem, allowing attackers to corrupt kernel memory and gain unauthorized access to system resources. According to CWE classification, this vulnerability maps to CWE-121, which describes "Stack-based Buffer Overflow" and CWE-125, which addresses "Out-of-bounds Read" conditions that can lead to privilege escalation.
The operational impact of CVE-2016-0171 is severe and far-reaching, as it allows local attackers to achieve complete system compromise without requiring network connectivity or specialized attack infrastructure. Once successfully exploited, the vulnerability enables attackers to execute arbitrary code with the highest system privileges, potentially leading to complete system takeover, data exfiltration, or persistence mechanisms establishment. The attack vector requires only local access to the target system, making it particularly dangerous in environments where users may have legitimate access to systems but could be compromised through social engineering or other means. This vulnerability affects enterprise environments significantly, as it can be exploited by malicious insiders or attackers who have gained initial access to a system through other means. The impact extends beyond individual systems to potentially compromise entire networks when attackers use this privilege escalation to move laterally between systems and establish persistent access.
Mitigation strategies for CVE-2016-0171 primarily involve applying the official Microsoft security patches released in the February 2016 security updates, which address the underlying kernel-mode driver vulnerabilities. System administrators should prioritize patch deployment across all affected Windows versions, particularly in enterprise environments where the risk of exploitation is higher. Additional defensive measures include implementing the principle of least privilege by restricting user accounts to standard privileges and avoiding administrative rights for routine operations. The use of exploit protection features such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) can make exploitation more difficult, though these are not complete defenses against kernel-level exploits. Network segmentation and monitoring for suspicious privilege escalation activities can help detect exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to T1068, which describes "Exploitation for Privilege Escalation," and T1059, which covers "Command and Scripting Interpreter" as attackers may use the elevated privileges to execute additional malicious commands. Organizations should also implement regular security assessments and vulnerability scanning to identify systems running unpatched versions of the affected operating systems.