CVE-2017-8675 in Windows
Summary
by MITRE
The Windows Kernel-Mode Drivers component on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows an elevation of privilege vulnerability when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability".. This CVE ID is unique from CVE-2017-8720.
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Analysis
by VulDB Data Team • 01/12/2021
The vulnerability identified as CVE-2017-8675 represents a critical elevation of privilege flaw within the Windows kernel-mode drivers, specifically affecting the Win32k component that manages user-mode graphics interfaces and windowing systems. This vulnerability resides in the core operating system functionality that handles graphical user interface operations, making it particularly dangerous as it can be exploited to gain higher system privileges than originally intended. The affected systems span multiple Windows versions including server and client operating systems, creating widespread exposure across enterprise and desktop environments. The vulnerability specifically manifests when the Win32k component fails to properly validate and handle memory objects, creating potential attack vectors for malicious actors seeking to escalate their privileges from standard user to administrative level access.
The technical flaw within the Win32k subsystem stems from improper memory handling mechanisms that allow attackers to manipulate kernel-mode objects through user-mode applications. This memory corruption vulnerability occurs during the processing of graphics-related operations and window management functions, where the kernel fails to validate object references properly. The flaw enables an attacker to craft specially crafted applications or exploits that can manipulate memory structures in ways that bypass normal privilege checks. According to CWE classification, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read scenarios. The vulnerability is particularly concerning because it operates at kernel level where privilege escalation can result in complete system compromise, making it a prime target for advanced persistent threat actors.
The operational impact of CVE-2017-8675 extends beyond simple privilege escalation, as it provides attackers with the foundation for more sophisticated attacks within compromised systems. Once an attacker achieves elevation of privilege, they can modify system files, install malware, access sensitive data, and establish persistent backdoors. The vulnerability's presence in multiple Windows versions means that organizations with legacy systems or those not yet patched face significant risk exposure. Security researchers have documented that this vulnerability can be leveraged in conjunction with other attack vectors, particularly through social engineering or initial access points such as phishing emails. The vulnerability's exploitation requires minimal user interaction and can be automated, making it particularly dangerous in enterprise environments where users may not be security-aware. Organizations with systems running the affected Windows versions are vulnerable to attacks that can result in full system compromise without requiring specialized knowledge or tools.
Mitigation strategies for CVE-2017-8675 primarily focus on immediate patch deployment from Microsoft, as the vendor released security updates specifically addressing this vulnerability through the July 2017 security bulletin. Organizations should prioritize patch management processes and ensure all affected systems receive the relevant security updates promptly. Additional defensive measures include implementing application whitelisting policies, disabling unnecessary graphics services, and monitoring for suspicious kernel-mode activity. Network segmentation and privilege separation can help limit the potential impact if exploitation occurs, while security monitoring solutions should be configured to detect anomalous behavior patterns consistent with privilege escalation attempts. The vulnerability's characteristics align with ATT&CK technique T1068, which covers exploit for privilege escalation, and T1059, which addresses command and scripting interpreter usage. Organizations should also consider implementing the principle of least privilege and regularly auditing user access rights to minimize the potential damage from successful exploitation attempts.