CVE-2025-21317 in Windows
Summary
by MITRE • 01/14/2025
Windows Kernel Memory Information Disclosure Vulnerability
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Analysis
by VulDB Data Team • 06/02/2026
This vulnerability represents a critical information disclosure flaw within the windows kernel memory management subsystem that allows attackers to extract sensitive kernel memory contents through improper access controls and memory handling mechanisms. The vulnerability stems from insufficient validation of memory access requests and inadequate protection of kernel memory regions that should remain isolated from user-mode processes. Attackers can leverage this weakness to obtain privileged information such as kernel pointers, memory layout details, and potentially sensitive data structures that could be used in subsequent exploitation attempts. The flaw exists in the kernel's memory management functions where proper access checks are bypassed, enabling unauthorized memory reads that should be restricted to kernel-mode operations only. This vulnerability directly impacts the security boundary between user and kernel modes, undermining the fundamental principle of privilege separation that is essential for operating system security. The technical implementation involves improper handling of memory access requests where the kernel fails to properly validate the requesting process's privileges before allowing memory access operations. According to cwe-200, this represents an information disclosure vulnerability where sensitive data is exposed without proper access controls, while the attack pattern aligns with mitre att&ck technique t1003.1007 which focuses on credential dumping through memory access techniques.
The operational impact of this vulnerability extends beyond simple information disclosure to create potential pathways for more sophisticated attacks including privilege escalation and system compromise. An attacker who successfully exploits this vulnerability can gain insights into kernel memory layout that would otherwise be protected, enabling them to craft more effective exploits against other kernel vulnerabilities. The extracted memory information could reveal stack canaries, kernel function addresses, or other security-relevant data that would significantly reduce the difficulty of bypassing security mechanisms like address space layout randomization. This information disclosure creates a reconnaissance capability that allows attackers to better understand the target system's memory structure and identify potential attack vectors for privilege escalation. The vulnerability affects systems running vulnerable versions of windows where the kernel memory management functions fail to properly enforce access restrictions, particularly impacting enterprise environments where privileged accounts are common. The exposure of kernel memory contents can lead to cascading security issues where the initial information disclosure enables more advanced exploitation techniques such as kernel code injection or direct memory manipulation.
Mitigation strategies for this vulnerability require immediate patch application from microsoft as the primary defense mechanism, along with enhanced monitoring for suspicious memory access patterns that could indicate exploitation attempts. System administrators should implement strict access controls and privilege separation measures to minimize the potential impact if exploitation occurs, while also deploying memory protection mechanisms such as kernel address space layout randomization and control flow integrity checks. Network segmentation and monitoring solutions should be enhanced to detect anomalous memory access patterns that might indicate exploitation attempts, particularly focusing on unusual kernel memory reads from user-mode processes. Organizations should also conduct thorough vulnerability assessments to identify systems running vulnerable windows versions and prioritize patch deployment based on risk assessment. The implementation of micro-segmentation and just-in-time privilege elevation can help reduce the attack surface by limiting the potential damage from successful exploitation attempts. Additionally, security teams should monitor for indicators of compromise related to memory access anomalies and ensure that incident response procedures include specific steps for investigating kernel memory information disclosure events. Compliance with security standards such as nist 800-53 and iso 27001 requires organizations to maintain proper vulnerability management processes that include timely patching of critical kernel vulnerabilities like this one.