CVE-2021-41340 in Windows
Summary
by MITRE • 10/13/2021
Windows Graphics Component Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 10/15/2021
The Windows Graphics Component Remote Code Execution Vulnerability CVE-2021-41340 represents a critical security flaw within Microsoft Windows operating systems that affects the graphics rendering subsystem. This vulnerability resides in the Windows Graphics Component and specifically impacts how the system processes certain graphics-related data structures. The flaw allows an attacker to execute arbitrary code on a target system with the same privileges as the logged-on user, potentially enabling full system compromise when exploited. The vulnerability is particularly concerning because graphics processing is fundamental to most Windows operations and applications, making it a prime target for exploitation.
The technical nature of this vulnerability stems from improper input validation within the Windows Graphics Component when handling specific graphic file formats and rendering operations. Attackers can craft malicious graphic files or manipulate existing graphics data in ways that trigger memory corruption within the graphics processing pipeline. This memory corruption leads to arbitrary code execution, which can be leveraged to bypass security controls and gain unauthorized access to system resources. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, where insufficient bounds checking allows attackers to overwrite memory locations that control program execution flow. The flaw exists in the way the graphics subsystem handles certain data structures during rendering operations, particularly when processing specific image formats or graphics commands.
The operational impact of CVE-2021-41340 extends beyond simple remote code execution, as it can be exploited through multiple attack vectors including email attachments, web downloads, and malicious websites. The vulnerability affects various Windows versions including Windows 10, Windows 11, and Windows Server 2019 and 2022, making it a widespread concern across enterprise environments. Attackers can leverage this vulnerability to establish persistent access, escalate privileges, and potentially move laterally within networks. The remote nature of the exploit means that users do not need to interact with malicious content for the attack to succeed, as the vulnerability can be triggered during normal graphics processing operations. This characteristic aligns with ATT&CK technique T1059.007 for command and script interpreter, where attackers can execute malicious code through legitimate system processes.
Mitigation strategies for CVE-2021-41340 primarily focus on immediate patch deployment through Microsoft's regular security updates, which address the underlying memory corruption issue in the graphics component. Organizations should prioritize applying the relevant security patches as soon as they become available, particularly for systems that handle untrusted graphics content or operate in high-risk environments. Network segmentation and access controls can help limit the potential impact of successful exploitation by restricting lateral movement capabilities. Additionally, implementing application whitelisting policies and disabling unnecessary graphics processing features can reduce attack surface. Security monitoring should focus on unusual graphics processing activities and potential code execution attempts, while endpoint detection and response solutions should be configured to detect anomalous behavior patterns consistent with memory corruption exploits. The vulnerability's classification as a remote code execution flaw makes it particularly important to maintain up-to-date security controls and incident response procedures to effectively manage potential exploitation attempts.