CVE-2019-1097 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when DirectWrite improperly discloses the contents of its memory, aka 'DirectWrite Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-1093.
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Analysis
by VulDB Data Team • 07/02/2020
The CVE-2019-1097 vulnerability represents a critical information disclosure flaw within Microsoft's DirectWrite graphics rendering engine that affects Windows operating systems. This vulnerability stems from improper memory handling within the DirectWrite component responsible for text rendering in Windows applications and services. The flaw allows malicious actors to potentially access sensitive memory contents that should remain protected from unauthorized disclosure, creating a significant security risk for affected systems.
DirectWrite is a core Windows component that provides advanced text rendering capabilities for applications across the Windows ecosystem. The vulnerability manifests when the rendering engine fails to properly sanitize memory access patterns during text processing operations, potentially exposing kernel memory contents to user-mode applications. This type of information disclosure can provide attackers with valuable insights into system memory layout, potentially enabling more sophisticated attacks such as privilege escalation or further exploitation. The vulnerability specifically impacts Windows 10 versions and Windows Server 2016 and 2019, with the issue being categorized as a memory corruption vulnerability that allows for unauthorized data exposure.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can serve as a stepping stone for more serious attacks within the Windows security model. Attackers could leverage the leaked memory information to bypass security mitigations such as address space layout randomization or to craft more effective exploits against other system components. This vulnerability aligns with CWE-200, which specifically addresses improper information disclosure, and can be mapped to ATT&CK technique T1059.001 for execution through Windows Command Shell. The exposure of memory contents may reveal sensitive data structures, function pointers, or system configuration information that could be used to refine subsequent attack vectors.
Mitigation strategies for CVE-2019-1097 primarily involve applying Microsoft's security updates and patches released through Windows Update or Microsoft Update Catalog. Organizations should prioritize immediate deployment of the relevant security patches, particularly for systems running affected Windows versions. Additionally, implementing network segmentation and access controls can help limit potential exploitation opportunities, while monitoring for unusual memory access patterns or process behavior may aid in detecting attempted exploitation. Security teams should also consider implementing application whitelisting policies to restrict execution of potentially malicious code that might attempt to exploit this vulnerability. The vulnerability demonstrates the importance of proper memory management in graphics rendering components and highlights how seemingly isolated flaws in system libraries can create broader security implications across the entire Windows operating system.