CVE-2020-0637 in Windows
Summary
by MITRE
An information disclosure vulnerability exists when Remote Desktop Web Access improperly handles credential information, aka 'Remote Desktop Web Access Information Disclosure Vulnerability'.
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Analysis
by VulDB Data Team • 03/20/2024
This vulnerability resides within the Remote Desktop Web Access component of Microsoft Windows operating systems, representing a critical information disclosure flaw that could enable unauthorized access to sensitive credential data. The vulnerability specifically manifests when the web access interface fails to properly sanitize or validate credential information during processing, creating potential exposure points for authentication tokens and user credentials. The flaw affects systems running Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, and Windows Server 2019, particularly those configured with Remote Desktop Web Access services. From a cybersecurity perspective, this vulnerability aligns with CWE-200, which addresses information exposure through improper handling of sensitive data, and represents a significant weakness in Microsoft's authentication infrastructure. The vulnerability operates at the application layer and could be exploited by attackers positioned within the network perimeter or those who have already gained initial access through other means. The impact extends beyond simple credential theft as it could enable lateral movement within networks, privilege escalation, and potentially full system compromise when combined with other exploitation techniques.
The technical exploitation of CVE-2020-0637 occurs through manipulation of the Remote Desktop Web Access service interface, where improperly handled authentication data could be exposed through response messages or log files. Attackers can potentially craft specific requests that trigger the information disclosure behavior, causing the system to inadvertently reveal credential information or authentication tokens. This vulnerability demonstrates poor input validation and output sanitization practices within Microsoft's web access components, creating a pathway for attackers to extract sensitive data without requiring elevated privileges. The flaw essentially represents a failure in proper security boundary enforcement within the Remote Desktop services, where the web interface does not adequately protect authentication information from being exposed to unauthorized parties. The vulnerability's exploitation requires minimal privileges and can be automated, making it particularly dangerous in enterprise environments where multiple users access remote desktop services through web interfaces. Network-based attacks can leverage this vulnerability to gather authentication data that can then be used to establish persistent access to target systems.
The operational impact of this vulnerability extends beyond immediate credential compromise to encompass broader security implications for enterprise environments. Organizations using Remote Desktop Web Access services face potential exposure of user authentication tokens, session identifiers, and potentially full credentials that could enable attackers to maintain access even after initial compromise. The vulnerability creates opportunities for attackers to perform reconnaissance activities, map network topology, and identify additional targets within the organization's infrastructure. Security teams must consider this vulnerability as a potential stepping stone for more sophisticated attacks, including privilege escalation and data exfiltration operations. The exposure of credential information could lead to cascading security failures where compromised accounts provide access to multiple systems and applications within the network. From an enterprise risk management perspective, this vulnerability represents a significant concern for organizations that rely on web-based remote access solutions, as it undermines the fundamental security assumptions of their remote access infrastructure.
Mitigation strategies for CVE-2020-0637 should focus on immediate patch deployment and configuration hardening measures. Microsoft released security updates that address this vulnerability through proper credential sanitization and input validation mechanisms within the Remote Desktop Web Access service. Organizations should prioritize deployment of the relevant security patches as soon as possible, particularly for systems running affected Windows Server versions. Network segmentation and access control measures can provide additional defense-in-depth, limiting the exposure of Remote Desktop Web Access services to only authorized users and systems. Implementing proper logging and monitoring of Remote Desktop Web Access activities can help detect potential exploitation attempts and credential harvesting activities. Security controls should include disabling unnecessary Remote Desktop Web Access features, implementing multi-factor authentication for remote access, and regularly reviewing access logs for suspicious activities. From a compliance standpoint, organizations should ensure that their security configurations align with industry standards such as nist 800-53 and iso 27001 requirements for secure remote access and credential management. The vulnerability also highlights the importance of regular security assessments and penetration testing to identify similar information disclosure vulnerabilities within remote access infrastructure.