CVE-2016-9485 in CounterACT SecureConnector Agent
Summary
by MITRE
On Windows endpoints, the SecureConnector agent must run under the local SYSTEM account or another administrator account in order to enable full functionality of the agent. The typical configuration is for the agent to run as a Windows service under the local SYSTEM account. The SecureConnector agent runs various plugin scripts and executables on the endpoint in order to gather and report information about the host to the CounterACT management appliance. The SecureConnector agent downloads these scripts and executables as needed from the CounterACT management appliance and runs them on the endpoint. The SecureConnector agent fails to set any permissions on downloaded file objects. This allows a malicious user to take ownership of any of these files and make modifications to it, regardless of where the files are saved. These files are then executed under SYSTEM privileges. A malicious unprivileged user can overwrite these executable files with malicious code before the SecureConnector agent executes them, causing the malicious code to be run under the SYSTEM account.
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Analysis
by VulDB Data Team • 12/27/2024
The vulnerability described in CVE-2016-9485 represents a critical privilege escalation flaw within the SecureConnector agent implementation on Windows endpoints. This vulnerability stems from inadequate file permission management during the agent's operation, creating a pathway for unprivileged users to execute malicious code with elevated SYSTEM privileges. The SecureConnector agent operates under the assumption that it must run with elevated privileges to function properly, specifically requiring either the local SYSTEM account or another administrator account to access all necessary system resources. This design choice creates a security boundary that, when properly configured, should prevent unauthorized access to system-level operations. However, the agent's failure to enforce proper file permissions on downloaded executables creates a fundamental weakness that directly undermines the security model.
The technical flaw manifests in the agent's handling of plugin scripts and executables that are dynamically downloaded from the CounterACT management appliance. These components are essential for the agent's functionality as they gather system information and report it back to the management system. The agent's download and execution process operates without implementing proper access control lists or file permission settings on the downloaded objects. This oversight creates a race condition vulnerability where any user with access to the endpoint can manipulate these files before execution occurs. The absence of file permissions enforcement means that even users without administrative privileges can modify or replace executable files that will subsequently run under the SYSTEM account context. This vulnerability directly maps to CWE-276, which describes improper file permissions, and demonstrates a classic example of insecure file handling that can lead to privilege escalation attacks.
The operational impact of this vulnerability is severe and far-reaching, particularly in enterprise environments where the SecureConnector agent is deployed across multiple endpoints. An attacker with only standard user privileges can exploit this weakness to gain SYSTEM-level access to compromised machines, effectively bypassing the intended security boundaries. The malicious code execution occurs under the SYSTEM account, which typically has unrestricted access to system resources, making it possible to escalate privileges beyond what the initial user account should have access to. This vulnerability undermines the principle of least privilege and allows attackers to perform actions such as installing persistent backdoors, modifying system configurations, accessing sensitive data, or even compromising the entire network infrastructure. The attack vector is particularly dangerous because it does not require administrative access to the endpoint itself, making it accessible to users who may have legitimate access to the system but should not have elevated privileges.
Mitigation strategies for CVE-2016-9485 should focus on implementing proper file permission controls and access management within the SecureConnector agent's operation. Organizations should ensure that downloaded executable files are created with restrictive permissions that prevent modification by unauthorized users, even when running under elevated privileges. The agent should enforce proper file ownership and access control lists to prevent unauthorized modification of downloaded components. Additionally, implementing file integrity checking mechanisms can help detect when downloaded files have been tampered with before execution occurs. Security administrators should also consider deploying additional monitoring and detection capabilities to identify suspicious file modification activities around the SecureConnector agent's working directories. The solution aligns with ATT&CK technique T1068, which covers privilege escalation through local exploitation, and emphasizes the importance of maintaining proper file system security controls. Organizations should also evaluate their overall security posture and consider implementing application whitelisting policies to prevent unauthorized executables from running on endpoints, thereby reducing the attack surface available to potential adversaries.