CVE-2019-1094 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when the Windows GDI component improperly discloses the contents of its memory, aka 'Windows GDI Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-1095, CVE-2019-1098, CVE-2019-1099, CVE-2019-1100, CVE-2019-1101, CVE-2019-1116.
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Analysis
by VulDB Data Team • 10/18/2023
The Windows Graphics Device Interface GDI component vulnerability represents a critical information disclosure flaw that affects the operating system's graphics rendering subsystem. This vulnerability specifically manifests when the GDI component fails to properly manage memory access controls, leading to unauthorized exposure of sensitive data stored in memory regions. The issue stems from improper validation of memory boundaries during graphics processing operations, creating potential pathways for malicious actors to extract confidential information from system memory. Such vulnerabilities are particularly concerning in enterprise environments where Windows systems handle sensitive data and maintain extensive memory footprints. The flaw demonstrates a fundamental breakdown in memory management practices within the graphics subsystem, where the component does not adequately protect against cross-contamination of memory segments that should remain isolated.
The technical implementation of this vulnerability involves the GDI component's handling of graphics objects and memory allocation patterns during rendering operations. When processing certain graphics commands or manipulating graphical elements, the component fails to enforce proper memory access restrictions, allowing adjacent memory regions to be accessed and potentially disclosed. This behavior aligns with CWE-200, which addresses improper information exposure, and represents a classic case of memory corruption that enables information leakage. The vulnerability typically occurs during operations involving bitmap manipulation, graphic rendering, or when processing graphics commands that require memory allocation for temporary storage. Attackers can exploit this by crafting specific graphics operations that trigger the memory disclosure behavior, potentially accessing sensitive data such as cryptographic keys, user credentials, or application memory contents.
The operational impact of this information disclosure vulnerability extends beyond simple data exposure to encompass potential compromise of system integrity and confidentiality. When an attacker successfully exploits this vulnerability, they may gain access to sensitive information that could be used for further attacks, including credential theft, privilege escalation, or targeted attacks against other system components. The vulnerability's impact is particularly severe in environments where Windows systems process confidential data or maintain privileged user sessions. From an attacker's perspective, this vulnerability provides a stealthy method of information extraction that may not immediately trigger security alerts, making it particularly dangerous for long-term reconnaissance activities. The disclosed information could include application memory contents, system configuration details, or other sensitive data that could be leveraged for additional compromise. This aligns with ATT&CK technique T1005, which covers data from local system, and represents a significant threat to information security in enterprise environments.
Mitigation strategies for this vulnerability should focus on both immediate patch deployment and broader system hardening measures. Microsoft released security updates that address the memory management issues within the GDI component, requiring administrators to apply the relevant patches promptly to prevent exploitation. System administrators should also implement monitoring solutions that can detect anomalous graphics processing behavior or memory access patterns that might indicate exploitation attempts. Network segmentation and privilege separation can help limit the potential impact if exploitation occurs, while regular security assessments should verify that the patch has been properly applied and that no residual vulnerabilities exist. Additional protective measures include implementing application whitelisting policies to restrict graphics processing applications, monitoring for suspicious graphics command sequences, and conducting regular vulnerability assessments of graphics-related components. The remediation process should also include comprehensive testing to ensure that legitimate graphics functionality remains intact while addressing the information disclosure vulnerability. Organizations should also consider implementing memory protection mechanisms such as address space layout randomization and data execution prevention to make exploitation more difficult. Regular security awareness training for system administrators regarding the importance of timely patch management and the potential impact of graphics-related vulnerabilities can help prevent exploitation through delayed remediation efforts.