CVE-2017-8467 in Windows
Summary
by MITRE
Graphics in Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an elevation of privilege vulnerability due to the way it handles objects in memory, aka "Win32k Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 12/31/2020
The CVE-2017-8467 vulnerability represents a critical elevation of privilege flaw within Microsoft Windows operating systems that affects multiple versions including Windows 7 SP1 through Windows 10 version 1703. This vulnerability specifically resides in the win32k.sys kernel-mode driver component which manages graphics rendering and user interface elements in Windows. The flaw stems from improper handling of objects in memory during graphics operations, creating a pathway for malicious actors to escalate their privileges from standard user level to system-level access. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, though its manifestation occurs through memory management issues rather than traditional buffer overflows. This type of vulnerability is particularly dangerous because it operates at the kernel level where malicious code can execute with the highest privileges available to the operating system.
The technical exploitation of this vulnerability occurs when a malicious application or script triggers a specific sequence of graphics operations that cause the win32k.sys driver to improperly manage memory objects. Attackers can leverage this flaw by crafting specially designed graphics content or by manipulating existing graphics rendering processes to cause memory corruption that results in privilege escalation. The vulnerability does not require user interaction for exploitation, making it particularly dangerous in targeted attacks where attackers can remotely execute malicious code that triggers the flawed memory handling behavior. This flaw is categorized under the ATT&CK technique T1068 for "Exploitation for Privilege Escalation" and specifically relates to the "Exploitation of a vulnerability in a Windows kernel component" category. The vulnerability allows attackers to gain system-level privileges without requiring authentication, enabling them to install malware, modify system files, or establish persistent access to compromised systems.
The operational impact of CVE-2017-8467 extends beyond individual system compromise to potentially affect entire enterprise networks, particularly in environments where users may encounter malicious graphics content through email attachments, web browsing, or compromised applications. The vulnerability's presence across multiple Windows versions means that organizations with mixed operating system environments face significant exposure risks, as attackers can target the most vulnerable system in their network. Organizations running affected versions of Windows Server 2008 R2, Windows 8.1, and Windows 10 versions 1511, 1607, and 1703 are particularly at risk due to the widespread use of these operating systems in enterprise environments. The vulnerability's exploitation can lead to complete system compromise, data exfiltration, and the establishment of persistent backdoors that are difficult to detect and remove. Security professionals should note that this vulnerability was patched by Microsoft as part of their security updates, but organizations that have not applied the patch remain vulnerable to exploitation.
Mitigation strategies for CVE-2017-8467 primarily focus on immediate patch deployment as recommended by Microsoft's security advisories. Organizations should prioritize applying the relevant security updates to all affected systems, particularly those running Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1, Windows RT 8.1, and affected Windows 10 versions. Additional defensive measures include implementing application whitelisting policies to restrict execution of potentially malicious graphics content, monitoring for unusual graphics-related system calls, and deploying network-based intrusion detection systems that can identify exploitation attempts. Security teams should also consider implementing runtime application control measures and maintaining up-to-date endpoint protection solutions that can detect and block exploitation attempts. The vulnerability highlights the importance of maintaining current security patches and implementing defense-in-depth strategies to protect against kernel-level exploits that can result in complete system compromise. Organizations should conduct regular vulnerability assessments to identify systems running affected versions and ensure that all systems receive timely security updates to prevent exploitation of this and similar vulnerabilities.