CVE-2019-1409 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when the Windows Remote Procedure Call (RPC) runtime improperly initializes objects in memory, aka 'Windows Remote Procedure Call Information Disclosure Vulnerability'.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 02/11/2024
The Windows Remote Procedure Call RPC runtime information disclosure vulnerability represents a critical flaw in the Windows operating system's core communication infrastructure. This vulnerability specifically affects how the RPC runtime initializes objects in memory, creating potential pathways for unauthorized information disclosure. The flaw exists within the fundamental mechanisms that enable distributed computing operations across Windows systems, making it particularly dangerous as it can be exploited across network boundaries to access sensitive data that should remain protected. The vulnerability impacts multiple Windows versions including Windows 7, Windows Server 2008, Windows Server 2012, and various other supported platforms, creating widespread exposure across enterprise environments.
The technical root cause of this vulnerability lies in improper object initialization within the RPC runtime environment, which can lead to memory corruption and information leakage. When RPC services process incoming requests, they initialize various objects in memory to handle the communication operations. The flaw occurs during this initialization phase where certain memory structures are not properly secured or sanitized, potentially exposing sensitive information from adjacent memory locations. This type of vulnerability falls under the CWE-248 category of "Uncaught Exception" and specifically relates to improper handling of memory objects during runtime initialization processes. The vulnerability can be triggered through specially crafted RPC requests that exploit the memory initialization flaw, allowing attackers to potentially read arbitrary memory contents that may contain credentials, session data, or other sensitive information.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it can enable more sophisticated attacks within network environments. Attackers who successfully exploit this vulnerability can potentially gain access to authentication tokens, session identifiers, or other sensitive data stored in memory, which could then be used to escalate privileges or conduct further attacks. The vulnerability is particularly concerning in enterprise environments where RPC services are heavily utilized for inter-process communication and distributed application functionality. Security researchers have noted that this vulnerability can be leveraged as a stepping stone for more advanced attacks, including privilege escalation and lateral movement within networks. The attack surface is broad as RPC is used extensively across Windows systems for various services including Windows Management Instrumentation, Distributed Component Object Model, and numerous enterprise applications.
Mitigation strategies for this vulnerability require immediate patching of affected systems through Microsoft security updates, which address the memory initialization flaw in the RPC runtime components. Organizations should prioritize patch deployment across all affected Windows systems, particularly those running server versions or systems with exposed RPC services. Network segmentation and firewall rules should be implemented to restrict unnecessary RPC traffic, limiting the attack surface and reducing potential exploitation opportunities. Additionally, monitoring systems should be configured to detect unusual RPC activity patterns that may indicate exploitation attempts. Security teams should also implement memory protection mechanisms and ensure proper access controls are in place for RPC services. The vulnerability's classification under the ATT&CK framework includes techniques such as credential access and privilege escalation, making comprehensive security monitoring essential for detecting potential exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify systems that may not have been properly patched, as well as to verify the effectiveness of implemented mitigations.