CVE-2018-8427 in Windows
Summary
by MITRE
An information disclosure vulnerability exists in the way that Microsoft Graphics Components handle objects in memory, aka "Microsoft Graphics Components Information Disclosure Vulnerability." This affects Microsoft Office, Microsoft Office Word Viewer, Office 365 ProPlus, Windows Server 2008, Microsoft PowerPoint Viewer, Microsoft Excel Viewer.
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Analysis
by VulDB Data Team • 05/23/2023
The vulnerability identified as CVE-2018-8427 represents a critical information disclosure flaw within Microsoft Graphics Components that affects multiple Microsoft Office applications and Windows Server environments. This vulnerability stems from improper handling of objects in memory during graphics processing operations, creating potential pathways for attackers to extract sensitive information from system memory. The flaw specifically manifests when Microsoft Graphics Components process certain graphic objects, leading to unintended data exposure that could compromise system security and confidentiality. Organizations utilizing affected Microsoft Office versions and Windows Server 2008 systems face significant risks as this vulnerability can be exploited to gain insights into system memory structures and potentially sensitive data.
The technical implementation of this vulnerability resides in the memory management practices of Microsoft Graphics Components, which are integral to rendering graphics within Office applications and viewer tools. When processing certain graphic objects, the components fail to properly validate memory boundaries and object references, allowing for memory corruption that can result in information disclosure. This type of vulnerability aligns with CWE-200, which describes improper handling of sensitive information, and specifically relates to memory safety issues that can lead to data leakage. The flaw operates at the intersection of graphics rendering and memory management, where the Graphics Components do not adequately protect against unauthorized memory access patterns that could expose system data to malicious actors.
The operational impact of CVE-2018-8427 extends beyond simple information disclosure, as it can potentially enable more sophisticated attacks when combined with other vulnerabilities or exploitation techniques. Attackers could leverage this vulnerability to extract memory addresses, system configurations, or potentially sensitive data from running processes, which could then be used to facilitate further attacks. The vulnerability affects a broad range of Microsoft products including Office 365 ProPlus, Office Word Viewer, PowerPoint Viewer, Excel Viewer, and Windows Server 2008, making it particularly dangerous as it impacts both desktop and server environments. This widespread applicability means that organizations with legacy systems running Windows Server 2008 are especially vulnerable, as these systems may not receive regular security updates, creating persistent exposure windows for attackers.
Mitigation strategies for this vulnerability should focus on immediate patch application through Microsoft's security update channels, as the company released specific patches addressing the memory handling issues in Graphics Components. Organizations should prioritize updating all affected Office applications and Windows Server environments to prevent exploitation. Additionally, implementing network segmentation and access controls can help limit the potential impact if exploitation occurs, while monitoring for unusual memory access patterns or network traffic could aid in early detection of attempted exploitation. The vulnerability demonstrates the importance of memory safety in graphics processing components and aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, as attackers may use information disclosure to gain intelligence for subsequent attack phases. Security teams should also consider implementing application whitelisting policies to restrict execution of potentially malicious code that could exploit this vulnerability, particularly in environments where immediate patching is not feasible.