CVE-2017-8471 in Windows
Summary
by MITRE
Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allow an authenticated attacker to run a specially crafted application when the Windows kernel improperly initializes objects in memory, aka "Win32k Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-8470, CVE-2017-8472, CVE-2017-8473, CVE-2017-8475, CVE-2017-8477, and CVE-2017-8484.
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Analysis
by VulDB Data Team • 08/21/2024
The CVE-2017-8471 vulnerability represents a critical information disclosure flaw within the Windows kernel's object initialization process, specifically affecting multiple versions of the windows operating system. This vulnerability resides in the win32k.sys kernel driver which manages user interface components and graphics rendering functionality. The flaw manifests when the kernel fails to properly initialize objects in memory during certain operations, creating potential pathways for unauthorized information exposure. The vulnerability is particularly concerning because it requires only authenticated user access to exploit, making it accessible to any user who can log into the affected system.
The technical implementation of this vulnerability stems from improper handling of kernel object initialization routines within the win32k.sys component. When legitimate applications attempt to interact with graphics and user interface elements, the kernel's object management code fails to properly validate or initialize memory structures before processing these requests. This improper initialization creates memory corruption conditions that can be leveraged to extract sensitive information from kernel memory spaces. The vulnerability is classified as a memory management error that falls under CWE-125, which describes out-of-bounds read conditions in memory operations. Attackers can exploit this by crafting malicious applications that trigger the specific kernel object initialization paths, potentially leading to privilege escalation or information disclosure attacks.
From an operational impact perspective, this vulnerability creates significant risk for enterprise environments where multiple users have authenticated access to systems. The authenticated nature of the exploit means that any user with valid credentials can potentially access kernel memory contents, which may contain sensitive data such as encryption keys, passwords, or other system information. The vulnerability affects a broad range of windows versions including legacy systems like windows 7 sp1 and server 2008 r2, making it particularly dangerous for organizations with extended support cycles. The impact extends beyond simple information disclosure, as the memory corruption conditions could potentially be chained with other vulnerabilities to achieve privilege escalation or remote code execution. Security analysts should note that this vulnerability aligns with ATT&CK technique T1068, which describes the use of local privilege escalation techniques, and T1005, which covers data from local system storage.
Mitigation strategies for CVE-2017-8471 should prioritize immediate patch deployment through microsoft's security updates, as the vulnerability has been fully addressed in subsequent security releases. Organizations should implement comprehensive monitoring for suspicious application behavior that might indicate exploitation attempts, particularly around graphics rendering and user interface operations. Network segmentation and least privilege access controls can help limit the potential impact if exploitation occurs, though the authenticated nature of the vulnerability means these controls provide limited protection against internal threats. System administrators should also consider implementing application whitelisting policies to prevent execution of potentially malicious applications that could exploit this vulnerability. The vulnerability's classification as a kernel-level memory management issue makes traditional endpoint protection solutions less effective, requiring more comprehensive security approaches including regular system updates, security awareness training, and robust incident response procedures. Organizations should also conduct thorough vulnerability assessments to identify systems running affected versions of windows and prioritize remediation efforts based on risk exposure and business criticality.