CVE-2017-8484 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-2017-8471, CVE-2017-8472, CVE-2017-8473, CVE-2017-8475, and CVE-2017-8477.
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Analysis
by VulDB Data Team • 08/19/2024
The vulnerability identified as CVE-2017-8484 represents a critical information disclosure flaw within the Windows kernel's object initialization process, specifically affecting multiple Windows operating system versions including Windows 7 SP1 through Windows 10 version 1703. This vulnerability operates at the kernel level where the Win32k.sys driver fails to properly validate object initialization states, creating a potential pathway for authenticated attackers to extract sensitive information from system memory. The flaw stems from improper handling of kernel-mode object structures during their creation and initialization phases, which can lead to information leakage that may reveal system internals or sensitive data structures. The vulnerability is classified under CWE-200 as an information disclosure weakness, where the improper initialization of kernel objects creates opportunities for attackers to gather information that could be used in subsequent exploitation attempts.
The operational impact of CVE-2017-8484 extends beyond simple information disclosure, as it provides attackers with valuable insights into kernel memory layouts and object states that can significantly aid in crafting more sophisticated attacks. When an authenticated user executes a specially crafted application, the vulnerability can be triggered through the Windows kernel's handling of user-mode to kernel-mode transitions, particularly in scenarios involving graphics rendering or window management operations. The attack vector leverages legitimate Windows kernel functionality while exploiting the improper initialization sequence, making detection more challenging as the malicious activity may appear as normal system behavior. This vulnerability is particularly concerning because it operates within the kernel space where privileges are elevated, and the information disclosure can reveal memory addresses, kernel structures, or other sensitive data that would otherwise remain protected. The flaw is categorized under the ATT&CK technique T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation, as the information gathered can be used to refine subsequent attack vectors.
Mitigation strategies for CVE-2017-8484 require a multi-layered approach combining immediate patching with defensive measures. Microsoft released security updates that address the improper object initialization in the Win32k.sys driver, specifically targeting the kernel memory handling routines that were vulnerable to this information disclosure attack. Organizations should prioritize applying the relevant security patches as soon as possible, as the vulnerability requires only authenticated access to exploit, making it accessible to users with legitimate system credentials. Network segmentation and privilege separation can help reduce the potential impact of exploitation, while monitoring for unusual kernel-mode activity or memory access patterns can provide early detection of attempted exploitation. The vulnerability's classification as a kernel-level information disclosure makes it particularly dangerous when combined with other vulnerabilities, as the leaked information can be used to bypass exploit mitigations or craft more precise attacks against the target system. Security teams should implement continuous monitoring of kernel-mode operations and maintain updated threat intelligence to identify potential exploitation attempts that may leverage this vulnerability alongside other attack techniques.