CVE-2017-8531 in Windows
Summary
by MITRE
Graphics in 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, 1703, Windows Server 2016, Microsoft Office 2007 Service Pack 3, and Microsoft Office 2010 Service Pack 2 allows improper disclosure of memory contents, aka "Graphics Uniscribe Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-0286, CVE-2017-0287, CVE-2017-0288, CVE-2017-0289, CVE-2017-8532, and CVE-2017-8533.
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Analysis
by VulDB Data Team • 08/20/2024
The Graphics Uniscribe Information Disclosure Vulnerability represents a critical memory corruption flaw affecting multiple Microsoft operating systems and office applications. This vulnerability resides within the graphics processing subsystem that handles text rendering and font management, specifically impacting the Uniscribe API which is responsible for complex text layout operations. The flaw manifests when the system processes certain graphics elements in conjunction with text rendering operations, creating conditions where sensitive memory contents can be inadvertently exposed to unauthorized processes.
The technical root cause of this vulnerability stems from improper memory handling within the graphics rendering pipeline. When processing specific font formats and text layout operations, the system fails to properly validate memory boundaries during rendering operations, allowing for information disclosure through memory access violations. This issue is classified under CWE-200, which addresses improper information disclosure, and specifically relates to memory corruption vulnerabilities that enable attackers to extract sensitive data from system memory. The vulnerability affects a broad range of Microsoft products 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 versions from Gold through 1703, Windows Server 2016, Microsoft Office 2007 SP3, and Microsoft Office 2010 SP2.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates opportunities for attackers to gather sensitive system information that could aid in further exploitation attempts. Attackers could potentially extract encryption keys, passwords, or other confidential data from memory segments that are improperly protected during graphics processing operations. This vulnerability aligns with ATT&CK technique T1005, which focuses on data from local system, and T1059, which covers command and scripting interpreter, as the information disclosure could enable more sophisticated attacks. The flaw particularly affects systems running Microsoft Office applications where document processing involves extensive graphics and text rendering operations, making it a significant concern for enterprise environments where sensitive documents are frequently processed.
Mitigation strategies for this vulnerability require immediate deployment of Microsoft security patches, specifically the patches released as part of the July 2017 security updates. Organizations should prioritize patching across all affected systems including servers, desktops, and office applications, as the vulnerability can be exploited through various attack vectors including malicious documents, web pages, or network-based attacks. Network segmentation and access controls should be implemented to limit exposure, particularly for systems that process untrusted documents or content. Additionally, monitoring for unusual memory access patterns or information disclosure attempts should be enabled through security information and event management systems. The vulnerability demonstrates the importance of comprehensive testing for graphics and font handling components, as these subsystems often receive less scrutiny than core operating system functions, making them prime targets for exploitation.