CVE-2021-1708 in Windows
Summary
by MITRE • 01/13/2021
Windows GDI+ Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 05/04/2025
The Windows GDI+ information disclosure vulnerability identified as CVE-2021-1708 represents a critical security flaw within the Graphics Device Interface Plus component of Microsoft Windows operating systems. This vulnerability resides in the way GDI+ handles certain image processing operations and memory management, creating an avenue for unauthorized information disclosure that could potentially lead to privilege escalation or further exploitation. The issue affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern across enterprise environments that rely on these platforms for core operations.
The technical root cause of this vulnerability stems from improper validation of image data structures within the GDI+ rendering engine. When processing specially crafted image files or graphics operations, the system fails to properly validate memory boundaries and buffer sizes, leading to information disclosure through memory corruption mechanisms. This flaw operates at the kernel level within the graphics subsystem, making it particularly dangerous as it can be triggered through legitimate user interactions with image files or graphics applications. The vulnerability manifests when the GDI+ component processes malformed image data that causes it to read beyond allocated memory boundaries, potentially exposing sensitive kernel memory contents to user-mode applications.
The operational impact of CVE-2021-1708 extends beyond simple information disclosure, as it creates potential pathways for more sophisticated attacks within Windows environments. Attackers can leverage this vulnerability to extract kernel memory addresses, which can then be used for bypassing security mechanisms such as address space layout randomization and exploit mitigation techniques. This information leakage can significantly aid in developing more targeted exploits that might otherwise be difficult to construct due to modern security protections. The vulnerability's presence in the graphics subsystem means that exploitation can occur through various attack vectors including email attachments, web downloads, or file transfers, making it particularly dangerous in enterprise environments where users frequently interact with multimedia content.
Mitigation strategies for this vulnerability should focus on immediate patch deployment through Microsoft's regular security updates, as the primary fix involves applying the official security patches released by Microsoft. Organizations should prioritize patch management processes to ensure all affected Windows systems receive the necessary updates promptly. Additionally, implementing network segmentation and access controls can help limit the potential impact of exploitation attempts, while monitoring for suspicious graphics-related activities or memory access patterns can aid in early detection of attempted exploitation. Security teams should also consider disabling unnecessary graphics processing capabilities where possible and implementing application whitelisting policies to prevent execution of potentially malicious image files. The vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and may map to ATT&CK techniques involving privilege escalation and information gathering through kernel-level exploitation methods.