CVE-2017-0156 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in Windows 7, Windows 8.1, Windows RT 8.1, Windows 10, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, and Windows Server 2016 when the Microsoft Graphics Component fails to properly handle objects in memory, aka "Windows Graphics Component Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 11/28/2022
The vulnerability identified as CVE-2017-0156 represents a critical elevation of privilege flaw within the Windows operating system family affecting multiple versions including Windows 7 through Windows 10 and various server editions. This security weakness resides within the Microsoft Graphics Component which serves as a fundamental element responsible for handling graphical operations and rendering processes across the Windows ecosystem. The vulnerability stems from improper handling of memory objects within the graphics subsystem, creating a pathway for malicious actors to escalate their privileges from standard user level to SYSTEM level access. This flaw specifically manifests when the graphics component processes certain graphical objects that have not been properly validated or sanitized, allowing attackers to exploit memory management inconsistencies.
The technical exploitation of this vulnerability occurs through a memory corruption issue that enables attackers to manipulate how graphical objects are handled in memory. When the graphics component processes malformed or specially crafted graphical data, it fails to properly validate the memory structures, potentially leading to arbitrary code execution within the context of the graphics processing subsystem. This memory handling failure creates an opportunity for privilege escalation attacks where an attacker with low-privilege access can leverage the vulnerability to gain elevated system privileges. The flaw falls under CWE-125, which describes out-of-bounds read conditions, and is categorized as a memory corruption vulnerability that allows for privilege escalation through improper object handling. Attackers can potentially abuse this weakness by crafting malicious graphical content or by exploiting existing graphical applications that process untrusted input data.
The operational impact of CVE-2017-0156 extends beyond simple privilege escalation, as it provides attackers with complete system control capabilities that can be leveraged for persistent access and data exfiltration. Once successfully exploited, the vulnerability allows malicious actors to execute code with the highest system privileges, potentially enabling them to install malware, modify system files, disable security features, or establish backdoors for continued access. The vulnerability affects systems running various Windows versions, making it particularly dangerous as it spans multiple generations of the operating system and affects both client and server deployments. Security researchers have noted that this vulnerability can be exploited through multiple attack vectors including web-based attacks, email attachments, or malicious documents that trigger the graphics component processing. The flaw's exploitation often requires minimal user interaction, making it particularly dangerous for enterprise environments where users may inadvertently encounter malicious content.
Mitigation strategies for CVE-2017-0156 primarily focus on immediate patch deployment through Microsoft's regular security updates, which address the underlying memory handling issues within the graphics component. Organizations should prioritize applying the security patches released by Microsoft as part of their regular update management procedures, as these updates contain fixes for the specific memory corruption vulnerabilities. Additional protective measures include implementing application whitelisting policies to restrict execution of untrusted graphical content, disabling unnecessary graphics processing features, and monitoring for suspicious graphical processing activities through endpoint detection and response systems. Security teams should also consider implementing network segmentation to limit lateral movement capabilities once an attacker has achieved initial access. The vulnerability aligns with ATT&CK technique T1068, which covers local privilege escalation, and requires comprehensive security monitoring to detect potential exploitation attempts. Organizations must maintain updated threat intelligence feeds to identify and respond to exploitation attempts targeting this specific vulnerability, as the flaw remains relevant in many legacy environments where patching has not been completed.