CVE-2017-8678 in Windows
Summary
by MITRE
The Windows kernel 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 information disclosure vulnerability when it improperly handles objects in memory, aka "Win32k Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-8677, CVE-2017-8680, CVE-2017-8681, and CVE-2017-8687.
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Analysis
by VulDB Data Team • 01/12/2021
The CVE-2017-8678 vulnerability represents a critical information disclosure flaw within the Windows kernel component that affects multiple versions of Microsoft Windows operating systems including server and client variants. This vulnerability specifically resides in the win32k.sys driver which manages user-mode graphics components and handles object management within the kernel space. The flaw manifests when the kernel component fails to properly validate or handle certain memory objects, creating potential pathways for unauthorized data access. The vulnerability is categorized under CWE-200, which specifically addresses "Information Exposure," and aligns with ATT&CK technique T1005 for "Data from Local System" as it enables adversaries to extract sensitive information from system memory.
The technical implementation of this vulnerability involves improper object handling within the Windows kernel's graphics subsystem where memory objects are not adequately validated before processing. When legitimate user-mode applications interact with graphics components through the win32k.sys driver, the kernel fails to properly sanitize or verify the memory structures being manipulated. This allows for potential information leakage through memory corruption or improper access control mechanisms. Attackers can potentially leverage this flaw to read sensitive data from kernel memory spaces that should normally be protected, including credentials, system information, or other confidential data stored in memory. The vulnerability's impact is particularly concerning because it operates at the kernel level where privilege escalation opportunities exist, making it a prime target for advanced persistent threat actors seeking to gain deeper system access.
From an operational perspective, this vulnerability creates significant risk for organizations running affected Windows versions as it can be exploited through various attack vectors including malicious software or compromised user sessions. The information disclosure could lead to credential exposure, system reconnaissance, or serve as a stepping stone for more sophisticated attacks. Organizations with legacy systems running Windows Server 2008 or Windows 7 are particularly vulnerable given these systems' extended support lifecycles and the continued presence of unpatched systems in enterprise environments. The vulnerability's classification as a remote code execution risk means that attackers could potentially exploit it without requiring physical access to the target system, making it particularly dangerous in networked environments.
Mitigation strategies for CVE-2017-8678 should prioritize immediate patch deployment through Microsoft's regular security updates, specifically addressing the Windows kernel memory handling issues. Organizations should implement network segmentation and access controls to limit potential attack surface, while also monitoring for unusual memory access patterns or information disclosure attempts. System administrators should conduct comprehensive vulnerability assessments to identify and remediate affected systems, particularly focusing on older Windows versions that may not receive continued support. Additionally, implementing behavioral monitoring solutions that can detect anomalous kernel memory access patterns can help identify exploitation attempts. The vulnerability's relationship to other related CVEs such as CVE-2017-8677 and CVE-2017-8680 demonstrates a broader pattern of kernel memory management issues that organizations should address holistically through comprehensive security hardening practices and regular security updates.