CVE-2016-7220 in Windows
Summary
by MITRE
Virtual Secure Mode in Microsoft Windows 10 allows local users to obtain sensitive information via a crafted application, aka "Virtual Secure Mode Information Disclosure Vulnerability."
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Analysis
by VulDB Data Team • 09/30/2022
The Virtual Secure Mode information disclosure vulnerability represents a significant security flaw in Microsoft Windows 10 that affects the operating system's virtualization-based security features. This vulnerability specifically targets the Virtual Secure Mode implementation which is designed to provide enhanced protection against malware and other security threats through hardware-assisted virtualization. The flaw enables local attackers with minimal privileges to exploit the system and extract sensitive information that should remain protected within the secure execution environment. According to the Common Weakness Enumeration catalog, this vulnerability maps to CWE-200, which describes insufficient logging or monitoring of security-relevant events, and CWE-310, which addresses cryptographic issues related to information disclosure. The vulnerability exists within the Windows 10 operating system's kernel-level components that manage virtual secure mode operations and memory isolation mechanisms.
The technical exploitation of this vulnerability occurs through a crafted application that leverages specific memory access patterns and virtualization features to bypass normal security boundaries. Attackers can manipulate the Virtual Secure Mode implementation to access memory regions that should be protected from unauthorized access, potentially exposing sensitive data such as cryptographic keys, user credentials, or system configuration information. The vulnerability stems from improper validation of memory access requests within the virtual secure mode subsystem, allowing malicious applications to perform memory reads that should be restricted. This flaw demonstrates a breakdown in the isolation properties that Virtual Secure Mode is designed to provide, enabling information leakage that can be exploited for further attacks. The attack vector is particularly concerning because it requires only local user privileges and does not necessitate elevated permissions or complex exploitation techniques.
The operational impact of this vulnerability extends beyond simple information disclosure, as it fundamentally undermines the security guarantees provided by Windows 10's virtual secure mode implementation. System administrators and security professionals face increased risk of credential theft, key compromise, and potential lateral movement within compromised systems. The vulnerability affects all versions of Windows 10 that implement Virtual Secure Mode, including desktop and server editions, making it a widespread concern across enterprise environments. Organizations that rely on Windows 10's security features for protection against advanced persistent threats or zero-day exploits may find their defenses weakened by this information disclosure vulnerability. The potential for this vulnerability to be combined with other exploits creates a more serious threat landscape where attackers can gather intelligence about system configurations and security implementations to plan more sophisticated attacks. According to the MITRE ATT&CK framework, this vulnerability relates to techniques in the Credential Access and Defense Evasion domains, as it enables both information gathering and potentially bypasses security controls.
Microsoft addressed this vulnerability through regular security updates and patches that corrected the memory access validation issues within the Virtual Secure Mode implementation. Organizations should ensure their Windows 10 systems are updated with the latest security patches to mitigate this risk. The recommended mitigation strategy involves applying the security update immediately and monitoring system logs for any suspicious activity that might indicate exploitation attempts. System administrators should also review their security policies to ensure that local user privileges are properly managed and that unnecessary applications with elevated capabilities are not running on systems that rely on Virtual Secure Mode protection. Additional defensive measures include implementing network monitoring to detect unusual memory access patterns and maintaining updated security information and event management systems that can identify potential exploitation attempts. The vulnerability serves as a reminder of the complexity involved in implementing secure virtualization features and the importance of thorough testing and validation of security mechanisms before deployment.