CVE-2016-9486 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. By default, these executable files are downloaded to and run from the %TEMP% directory of the currently logged on user, despite the fact that the SecureConnector agent is running as SYSTEM. Aside from the downloaded scripts, the SecureConnector agent runs a batch file with SYSTEM privileges from the temp directory of the currently logged on user. If the naming convention of this script can be derived, which is made possible by placing it in a directory to which the user has read access, it may be possible overwrite the legitimate batch file with a malicious one before SecureConnector executes it. It is possible to change this directory by setting the the configuration property config.script_run_folder.value in the local.properties configuration file on the CounterACT management appliance, however the batch file which is run does not follow this property.
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Analysis
by VulDB Data Team • 12/27/2024
The vulnerability described in CVE-2016-9486 represents a critical privilege escalation flaw within the SecureConnector agent implementation on Windows endpoints. This agent serves as a crucial component for endpoint monitoring and reporting within the CounterACT security management platform, requiring elevated privileges to function properly. The agent must operate under either the local SYSTEM account or another administrator-level account to access all necessary system resources and perform comprehensive host information gathering. The fundamental issue arises from the agent's inconsistent handling of execution contexts, specifically when managing temporary files and script execution paths.
The technical flaw manifests in the agent's improper use of temporary directories during script execution, creating a predictable path manipulation vulnerability. While the SecureConnector agent operates with SYSTEM privileges, it downloads and executes scripts from the currently logged-on user's %TEMP% directory rather than using a system-wide temporary location. This design decision creates a window of opportunity for privilege escalation attacks, as the agent's execution context does not align with its file access patterns. The vulnerability is particularly concerning because it allows a local user to manipulate the execution flow by overwriting legitimate batch files with malicious counterparts.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to execute arbitrary code with SYSTEM privileges on compromised endpoints. The attack vector is facilitated by the predictable naming conventions of the temporary batch files, which can be discovered through read access to the user's temporary directory. This vulnerability effectively undermines the principle of least privilege by allowing a low-privilege user to influence the execution of high-privilege processes. The configuration property config.script_run_folder.value exists to address this issue but fails to properly implement across all execution contexts, leaving the vulnerability persistently exploitable.
This vulnerability maps directly to CWE-276, which addresses improper privileges for system resources, and aligns with ATT&CK technique T1068, which covers privilege escalation through local exploitation. The flaw represents a classic case of insecure temporary file handling where the agent's security model is compromised by inconsistent execution contexts. Organizations deploying SecureConnector agents face significant risk from this vulnerability, as it provides a straightforward path for attackers to escalate privileges and potentially gain complete system control. The vulnerability demonstrates a fundamental flaw in the agent's architecture where administrative privileges are not properly isolated from user-level file operations, creating an attack surface that can be exploited without requiring elevated access to the system.
Mitigation strategies should focus on implementing proper directory isolation for temporary file execution, ensuring that all agent execution contexts use secure temporary locations that cannot be manipulated by local users. The configuration property mentioned in the vulnerability description should be properly enforced across all execution paths, and organizations should consider disabling the agent's ability to execute scripts from user-accessible temporary directories. Additionally, implementing proper file integrity monitoring and access control measures around temporary directories can help detect and prevent exploitation attempts. The vulnerability underscores the importance of maintaining consistent security contexts in privileged applications and highlights the critical need for proper privilege separation in security agent implementations.