CVE-2020-9090 in FusionAccess
Summary
by MITRE • 10/12/2020
FusionAccess version 6.5.1 has an improper authorization vulnerability. A command is authorized with incorrect privilege. Attackers with other privilege can execute the command to exploit this vulnerability. This may compromise normal service of the affected product.
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Analysis
by VulDB Data Team • 11/18/2020
The vulnerability identified as CVE-2020-9090 affects FusionAccess version 6.5.1 and represents a critical authorization flaw that undermines the security controls of the affected system. This issue stems from improper privilege management where specific commands are incorrectly authorized, allowing attackers with lower privileges to execute operations that should be restricted to higher-privileged users. The vulnerability exists within the access control mechanisms of the FusionAccess platform, which is designed to manage virtual desktop infrastructure and provide secure remote access to enterprise resources.
The technical flaw manifests as a failure in privilege validation during command execution processes. When users attempt to perform certain administrative or system-level operations, the authorization checks do not properly verify the user's privilege level before granting access to execute the command. This misconfiguration creates a pathway for privilege escalation attacks where malicious actors can leverage their existing access to perform unauthorized operations. The vulnerability falls under the CWE-284 category of "Improper Access Control" which specifically addresses issues where systems fail to properly enforce access restrictions and authorization policies.
From an operational impact perspective, this vulnerability poses significant risks to enterprise security infrastructure. Attackers who can exploit this flaw may gain unauthorized access to critical system functions that control user permissions, system configurations, and resource allocation within the FusionAccess environment. The compromised service availability and integrity can lead to unauthorized data access, system manipulation, and potential lateral movement within the network. Organizations relying on FusionAccess for remote desktop services face elevated risks of unauthorized access to sensitive corporate resources and potential data breaches.
The attack surface for this vulnerability extends beyond simple privilege escalation to include potential system compromise and service disruption. Adversaries can exploit this weakness to execute commands that may allow them to modify system configurations, create new user accounts, or access restricted data repositories. This aligns with ATT&CK technique T1078 which covers Valid Accounts and T1484 which addresses Domain Policy Modification, both of which can be facilitated through improper authorization controls. The vulnerability's impact is particularly concerning in enterprise environments where FusionAccess serves as a critical component of the remote access infrastructure.
Organizations should implement immediate mitigations including applying the vendor-provided patches and updates for FusionAccess version 6.5.1 to address the authorization flaw. System administrators should conduct thorough privilege reviews to ensure that access controls are properly enforced and that users have only the minimum necessary permissions for their roles. Network segmentation and monitoring should be enhanced to detect suspicious command execution patterns. Additionally, regular security assessments and penetration testing should be performed to identify similar authorization issues within the broader infrastructure. The remediation process should include validating that privilege checks are properly enforced and that command execution is appropriately restricted based on user authorization levels.