CVE-2006-0255 in VPN-1
Summary
by MITRE
Unquoted Windows search path vulnerability in Check Point VPN-1 SecureClient might allow local users to gain privileges via a malicious "program.exe" file in the C: folder, which is run when SecureClient attempts to launch the Sr_GUI.exe program.
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Analysis
by VulDB Data Team • 07/17/2018
The vulnerability described in CVE-2006-0255 represents a critical privilege escalation flaw within Check Point VPN-1 SecureClient software, specifically targeting Windows operating systems. This issue stems from improper handling of executable paths during the software's launch sequence, creating a dangerous condition where malicious actors can exploit the system's search behavior to execute arbitrary code with elevated privileges. The vulnerability manifests when the SecureClient application attempts to launch the Sr_GUI.exe program, but fails to properly quote the search path used to locate this executable.
The technical root cause of this vulnerability aligns with CWE-428, which describes the improper use of unquoted search paths in Windows environments. When Windows searches for executables in a path that contains spaces, it will search in each directory component of the path from left to right until it finds a match. If the path is not properly quoted, an attacker can place a malicious executable file in a directory that appears earlier in the search path, causing the system to execute the malicious file instead of the legitimate one. In this specific case, the vulnerability occurs because the application attempts to launch Sr_GUI.exe without properly quoting the path, allowing an attacker to place a malicious program.exe file in the C: root directory.
The operational impact of this vulnerability is severe, as it provides local users with a straightforward method to escalate their privileges on systems running Check Point VPN-1 SecureClient. The attack vector is particularly dangerous because it requires no special privileges to exploit, as the malicious file can be placed in the C: root directory by any local user. Once executed, the malicious code runs with the privileges of the user who launched the SecureClient application, potentially allowing attackers to gain elevated system access and execute further malicious activities. This vulnerability directly maps to ATT&CK technique T1068, which covers privilege escalation through the exploitation of system vulnerabilities.
The security implications extend beyond simple privilege escalation, as this flaw can enable attackers to establish persistent access to systems and potentially compromise entire networks. Attackers can leverage this vulnerability to install backdoors, modify system configurations, or exfiltrate sensitive data from systems that rely on VPN-1 SecureClient for network access. The vulnerability is particularly concerning in enterprise environments where VPN clients are widely deployed and where users may have varying levels of system access. Organizations using Check Point VPN-1 SecureClient should immediately implement mitigations to address this vulnerability, including applying the latest security patches from Check Point, properly quoting executable paths in the application configuration, and implementing additional access controls to limit local user privileges on systems running the vulnerable software. The vulnerability demonstrates the critical importance of proper path handling in Windows applications and highlights the need for thorough security testing of third-party software components.