CVE-2019-8461 in Endpoint Security Initial Client
Summary
by MITRE
Check Point Endpoint Security Initial Client for Windows before version E81.30 tries to load a DLL placed in any PATH location on a clean image without Endpoint Client installed. An attacker can leverage this to gain LPE using a specially crafted DLL placed in any PATH location accessible with write permissions to the user.
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Analysis
by VulDB Data Team • 12/11/2023
The vulnerability identified as CVE-2019-8461 affects Check Point Endpoint Security Initial Client for Windows versions prior to E81.30, representing a critical privilege escalation flaw that exploits improper DLL loading mechanisms. This vulnerability stems from the client application's insecure handling of dynamic link library loading processes during system initialization, particularly when the Endpoint Client is not yet installed on the target system. The flaw manifests when the application attempts to load DLLs from various locations within the system PATH without proper validation or security checks, creating an exploitable condition that adversaries can leverage for unauthorized system access.
The technical implementation of this vulnerability resides in the application's failure to enforce secure DLL loading practices, specifically violating the principle of least privilege and secure coding standards. When the Initial Client executes on a clean system without the full Endpoint Client installation, it searches for required libraries through the standard Windows PATH resolution mechanism without implementing proper security controls such as explicit DLL path resolution or integrity checking. This behavior creates a race condition and path traversal vulnerability that allows malicious actors to place a specially crafted malicious DLL in any directory within the PATH that has write permissions for the current user, enabling the system to load the attacker-controlled code instead of legitimate system libraries.
The operational impact of CVE-2019-8461 extends beyond simple privilege escalation, as it provides attackers with a persistent foothold within target environments that can be leveraged for further compromise. The vulnerability is particularly dangerous because it operates at the system initialization phase, meaning that successful exploitation can occur before security controls are fully operational, and the malicious DLL can execute with elevated privileges. This flaw aligns with CWE-426 Untrusted Search Path, which specifically addresses the dangers of insecure library loading practices, and represents a classic example of how insecure PATH handling can lead to arbitrary code execution. The attack vector is relatively straightforward for threat actors to exploit, requiring only write access to a PATH directory and the ability to execute the vulnerable Initial Client application.
Mitigation strategies for CVE-2019-8461 should focus on both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities. Organizations must immediately upgrade to Check Point Endpoint Security Initial Client version E81.30 or later, which contains the necessary patches to address the insecure DLL loading behavior. Additionally, system administrators should implement strict PATH management practices, ensuring that write permissions are minimized on PATH directories and that only trusted administrators have access to modify these locations. The implementation of application whitelisting solutions and enhanced monitoring of DLL loading activities can provide additional layers of defense, while adherence to the ATT&CK framework's T1055.001 technique for Process Injection and T1547.001 for Registry Run Keys can help detect and prevent exploitation attempts. Organizations should also consider implementing security awareness training to prevent social engineering attacks that might attempt to place malicious DLLs in PATH directories, as this vulnerability demonstrates the importance of maintaining secure system initialization processes and proper privilege management.