CVE-2020-1292 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in OpenSSH for Windows when it does not properly restrict access to configuration settings, aka 'OpenSSH for Windows Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 10/23/2020
The CVE-2020-1292 vulnerability represents a critical elevation of privilege flaw within OpenSSH for Windows implementations, exposing systems to unauthorized access and privilege escalation attacks. This vulnerability specifically targets the configuration management mechanisms within the OpenSSH Windows service, where inadequate access controls allow malicious actors to manipulate sensitive configuration parameters that should remain restricted to authorized administrators. The flaw exists in the Windows-specific OpenSSH implementation and affects versions prior to the patched releases, creating a persistent security risk for organizations relying on Windows-based SSH services.
The technical root cause of this vulnerability stems from improper access restriction mechanisms within the OpenSSH Windows service configuration handling. When the service processes configuration files and settings, it fails to properly validate or enforce access controls on critical configuration parameters that govern user permissions, authentication methods, and service behavior. This weakness allows local attackers with limited privileges to modify configuration settings that would normally require administrative access, effectively bypassing the principle of least privilege enforcement. The vulnerability manifests when the system does not properly enforce access control lists or permission checks on configuration files, enabling unauthorized modifications to service behavior and user access controls. This flaw aligns with CWE-284, which describes improper access control vulnerabilities where systems fail to properly enforce access restrictions on resources, and represents a classic case of insufficient privilege checking in service configuration management.
The operational impact of CVE-2020-1292 extends beyond simple privilege escalation, creating potential for broader system compromise and persistent access within affected environments. An attacker exploiting this vulnerability could modify SSH service configurations to grant additional privileges to compromised accounts, disable security features, or establish backdoor access mechanisms that persist across system reboots. The vulnerability particularly affects organizations using Windows OpenSSH servers for remote administration, as it allows attackers to elevate their privileges from standard user accounts to administrator level access. This makes the vulnerability especially dangerous in enterprise environments where SSH services are commonly used for remote system management and where privilege separation is critical for maintaining security boundaries. The impact is further amplified by the fact that the vulnerability can be exploited locally, meaning that any user with access to the system can potentially leverage this flaw to gain elevated privileges.
Mitigation strategies for CVE-2020-1292 should prioritize immediate patching of affected OpenSSH Windows implementations, with organizations verifying that their systems have been updated to versions containing the necessary security fixes. System administrators should conduct comprehensive inventory assessments to identify all instances of OpenSSH for Windows installations and ensure that all systems are running patched versions. Additional protective measures include implementing strict file access controls on SSH configuration files, monitoring for unauthorized configuration changes, and enforcing robust auditing procedures to detect potential exploitation attempts. Organizations should also consider implementing network segmentation and privilege separation techniques to limit the potential impact of successful exploitation, while maintaining regular security assessments to identify and remediate similar access control vulnerabilities. The vulnerability demonstrates the critical importance of proper access control implementation in service configurations and highlights the necessity of adhering to security best practices such as those outlined in the MITRE ATT&CK framework for privilege escalation techniques, particularly focusing on the persistence and privilege escalation tactics that could be leveraged through such configuration weaknesses.