CVE-2017-8556 in Windows
Summary
by MITRE
Graphics in 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 it fails to properly handle objects in memory, aka "Microsoft Graphics Component Elevation of Privilege Vulnerability". This CVE ID is unique from CVE-2017-8573 and CVE-2017-8574.
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Analysis
by VulDB Data Team • 12/31/2020
The Microsoft Graphics Component Elevation of Privilege Vulnerability CVE-2017-8556 represents a critical security flaw within the Windows operating system family that affects multiple versions including 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, as well as Windows Server 2016. This vulnerability specifically resides in the graphics rendering components of Windows, which are responsible for processing and displaying graphical content across the operating system. The flaw manifests when the graphics subsystem fails to properly handle objects in memory, creating a potential pathway for malicious actors to escalate their privileges from standard user level to system level access. The vulnerability is particularly concerning because it leverages the graphics processing capabilities that are integral to modern computing environments, making it accessible through various attack vectors that could exploit the memory handling inconsistencies.
The technical nature of this vulnerability falls under the category of memory corruption issues that align with CWE-125, which describes out-of-bounds read conditions in software systems. When Windows processes graphical objects, particularly those involving complex rendering operations or malformed graphics data, the memory management within the graphics components becomes vulnerable to exploitation. Attackers can craft specially designed graphics files or manipulate existing graphics content to trigger buffer overflows or memory corruption scenarios that allow arbitrary code execution. The vulnerability specifically impacts the graphics component's ability to validate and process memory objects properly, creating opportunities for privilege escalation where an attacker with minimal system access could potentially gain full administrative privileges. This memory handling flaw operates at a low level within the Windows kernel's graphics processing subsystem, making it particularly dangerous as it can bypass standard security mechanisms and access protected system resources.
The operational impact of CVE-2017-8556 extends far beyond simple privilege escalation, as it represents a foundational security weakness that could enable complete system compromise. Organizations running affected Windows versions face significant risk exposure since the vulnerability can be exploited through various means including email attachments, web downloads, or malicious websites that contain specially crafted graphics content. The attack surface is broad given that graphics processing is fundamental to all Windows applications, making it extremely difficult to fully isolate or prevent exploitation. Security researchers have identified that this vulnerability can be chained with other exploits to create more sophisticated attack scenarios, potentially leading to full system takeover without requiring user interaction beyond initial access. The vulnerability's presence in both client and server operating systems means that enterprise environments face widespread exposure, particularly in environments where users have access to potentially untrusted graphics content or where automated systems process external graphics data.
Mitigation strategies for CVE-2017-8556 must address both immediate protection and long-term security posture improvements. Microsoft has released security patches through the August 2017 security updates that specifically address this vulnerability by correcting the memory handling procedures within the graphics components. Organizations should prioritize immediate deployment of these patches across all affected systems, particularly in server environments where the risk of exploitation is higher. Additional protective measures include implementing application whitelisting policies that restrict execution of graphics processing applications, enabling exploit protection features within Windows Defender Application Control, and configuring network-level protections to filter potentially malicious graphics content. The vulnerability aligns with ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation' and demonstrates how attackers can leverage graphics processing vulnerabilities to bypass security controls. Security teams should also monitor for indicators of compromise related to unusual graphics processing activity or unexpected privilege escalation events, as these may signal exploitation attempts. Given the nature of the vulnerability, organizations should also conduct thorough vulnerability assessments to identify other potential memory corruption issues in their Windows environments and implement comprehensive security monitoring to detect and respond to exploitation attempts effectively.