CVE-2018-0843 in Windows
Summary
by MITRE
The Windows kernel in Windows 10 version 1709 and Windows Server, version 1709 allows an information disclosure vulnerability due to how objects in memory are handled, aka "Windows Kernel Information Disclosure Vulnerability". This CVE is unique from CVE-2018-0742, CVE-2018-0756, CVE-2018-0809 and CVE-2018-0820.
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Analysis
by VulDB Data Team • 08/18/2024
The Windows kernel information disclosure vulnerability identified as CVE-2018-0843 represents a critical security flaw in Microsoft Windows 10 version 1709 and Windows Server version 1709 operating systems. This vulnerability specifically targets the kernel mode components responsible for memory management and object handling within the Windows operating system. The flaw arises from improper handling of memory objects during kernel operations, creating potential pathways for unauthorized information disclosure that could compromise system security. The vulnerability is particularly concerning because it operates at the kernel level where system privileges and access controls are most critical, making it a prime target for exploitation by malicious actors seeking to gain deeper system access.
The technical implementation of this vulnerability stems from how the Windows kernel manages memory objects and handles object references during system operations. When the kernel processes certain memory management functions, it fails to properly validate or sanitize object states before exposing them to user-mode applications or system components. This improper object handling creates information disclosure opportunities where sensitive kernel memory contents could be accessed through various system interfaces. The vulnerability is classified under CWE-200, which specifically addresses "Information Exposure" in software systems, and aligns with the broader category of kernel-level memory corruption issues that have historically been exploited by attackers. The flaw demonstrates a classic case of inadequate input validation and memory management practices that allow information leakage from privileged system components.
The operational impact of CVE-2018-0843 extends beyond simple information disclosure, as it provides attackers with valuable insights into kernel memory structures and system internals. This information can be leveraged to craft more sophisticated attacks that exploit other vulnerabilities present in the system, potentially leading to privilege escalation or system compromise. The vulnerability's classification as a kernel-level information disclosure means that successful exploitation could allow attackers to access sensitive system data, including memory addresses, kernel object structures, and potentially other confidential information that should remain protected within kernel space. This type of vulnerability aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, as attackers might use the leaked information to better understand system behavior and plan subsequent attack phases.
Mitigation strategies for this vulnerability require immediate patch deployment through Microsoft's regular security updates, as the primary fix involves correcting the kernel memory handling routines that cause the information disclosure. Organizations should prioritize updating their Windows 10 version 1709 and Windows Server version 1709 systems to the latest security patches released by Microsoft. Additionally, implementing network segmentation and access controls can help limit the potential impact of successful exploitation attempts. Security monitoring should focus on detecting unusual memory access patterns and information disclosure attempts within kernel space. The vulnerability's nature suggests that attackers might use it as a stepping stone for more advanced attacks, making comprehensive system hardening and regular security assessments essential for maintaining overall system integrity. Organizations should also consider implementing kernel-mode exploit detection mechanisms and monitoring for signs of kernel-level memory corruption or information leakage activities.