CVE-2023-21699 in Windows
Summary
by MITRE • 02/14/2023
Windows Internet Storage Name Service (iSNS) Server Information Disclosure Vulnerability
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 03/15/2023
The Windows Internet Storage Name Service iSNS server represents a critical information disclosure vulnerability that affects Microsoft Windows operating systems. This vulnerability resides within the iSNS protocol implementation which is designed to facilitate storage name resolution and management in internet storage networks. The flaw manifests when the iSNS server process fails to properly validate input parameters during the processing of certain network requests, potentially allowing unauthenticated attackers to extract sensitive information from the system. The vulnerability impacts various Windows versions including Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, and Windows Server 2022, making it particularly concerning given the widespread deployment of these operating systems in enterprise environments.
Technical exploitation of this vulnerability occurs through crafted network packets sent to the iSNS server service, which typically operates on UDP port 1614 and TCP port 1614. The flaw stems from inadequate input validation mechanisms within the server implementation, specifically when processing iSNS discovery and registration messages. When an attacker sends malformed or specially constructed iSNS protocol messages, the server may inadvertently disclose internal memory contents, system configuration details, or other sensitive information through its response mechanisms. This information disclosure can include memory addresses, internal data structures, or other system-specific details that could aid in further exploitation attempts. The vulnerability is classified under CWE-20 as "Improper Input Validation" and aligns with ATT&CK technique T1212 for "Exploitation for Credential Access" as the information disclosure can potentially lead to credential harvesting or system reconnaissance.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates opportunities for attackers to perform advanced persistent threat activities. Security researchers have identified that the disclosed information could reveal system architecture details, network configuration parameters, or other intelligence that would significantly aid in planning subsequent attacks. Organizations using iSNS for storage name resolution in their SAN (Storage Area Network) environments face heightened risk, as this vulnerability could expose storage topology information to unauthorized parties. The vulnerability is particularly dangerous because it can be exploited remotely without authentication, making it an attractive target for automated scanning and exploitation campaigns. Attackers could leverage this information to map storage networks, identify critical storage devices, or develop more sophisticated attack vectors against storage infrastructure components.
Mitigation strategies for this vulnerability require immediate implementation of Microsoft security patches and updates as released through the Windows Update mechanism. Organizations should prioritize patching systems running iSNS server functionality, particularly those with exposed network services or those operating in environments where network segmentation is insufficient. Network administrators should implement firewall rules to restrict access to iSNS ports (1614/UDP and 1614/TCP) to only trusted network segments and authorized management systems. Additional protective measures include disabling iSNS server functionality if not required for business operations, implementing network monitoring to detect anomalous iSNS traffic patterns, and conducting regular security assessments to identify any potential exploitation attempts. The vulnerability demonstrates the importance of secure coding practices and input validation in network service implementations, aligning with security best practices outlined in NIST SP 800-53 and ISO 27001 frameworks for information security management.