CVE-2019-0839 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when the Terminal Services component improperly discloses the contents of its memory, aka 'Windows Information Disclosure Vulnerability'. This CVE ID is unique from CVE-2019-0838.
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Analysis
by VulDB Data Team • 07/12/2024
The vulnerability identified as CVE-2019-0839 represents a critical information disclosure flaw within the Windows Terminal Services component that exposes sensitive memory contents to unauthorized entities. This vulnerability specifically affects the Remote Desktop Services functionality and operates at the system level where proper memory isolation mechanisms fail to prevent unauthorized access to internal system data. The flaw manifests when the terminal services component does not adequately protect memory segments containing sensitive information, allowing malicious actors to potentially extract confidential data through crafted requests or connections.
From a technical perspective, this vulnerability stems from improper memory handling within the Windows Terminal Services implementation where memory buffers containing session data, authentication tokens, or other sensitive information are not properly secured or sanitized before being accessible through network connections. The issue is classified under CWE-200 which specifically addresses "Information Exposure" and represents a fundamental breakdown in information protection mechanisms. The vulnerability allows for information disclosure through memory corruption or direct memory access techniques that bypass normal access controls and privilege boundaries.
The operational impact of CVE-2019-0839 extends beyond simple data exposure to potentially enable more sophisticated attacks including credential theft, session hijacking, and privilege escalation. Attackers exploiting this vulnerability could gain access to session-specific information that might include user credentials, session tokens, or other sensitive data that could be leveraged for further compromise. This vulnerability particularly affects systems running Windows 10 versions 1803 and 1809, Windows Server 2016 and 2019, where Terminal Services functionality is enabled and accessible. The threat landscape for this vulnerability aligns with ATT&CK technique T1083 which covers "File and Directory Discovery" and T1003 which covers "Credential Dumping" as attackers could potentially use this information to escalate privileges or establish persistent access.
Mitigation strategies for CVE-2019-0839 should focus on immediate patch deployment through Microsoft's security updates, which address the memory handling issues within the Terminal Services component. Organizations should implement network segmentation to limit access to Terminal Services functionality, disable unnecessary RDP access, and employ multi-factor authentication to reduce the attack surface. Additionally, monitoring for unusual connection patterns or memory access attempts can help detect potential exploitation attempts. The vulnerability highlights the importance of proper memory management and access control implementation in system services, particularly those handling sensitive user data. Security teams should also consider implementing network-based intrusion detection systems that can identify suspicious Terminal Services traffic patterns that might indicate exploitation attempts. Regular security assessments of terminal services configurations and memory protection mechanisms should be conducted to ensure proper implementation of information protection controls.