CVE-2022-26634 in VPN
Summary
by MITRE • 05/20/2022
HMA VPN v5.3.5913.0 contains an unquoted service path which allows attackers to escalate privileges to the system level.
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Analysis
by VulDB Data Team • 05/27/2022
The vulnerability identified as CVE-2022-26634 resides within HMA VPN version 5.3.5913.0 and represents a critical privilege escalation flaw stemming from an unquoted service path configuration. This issue fundamentally exploits the Windows service architecture by placing a service executable in a directory path that contains spaces without proper quotation marks around the path. The flaw creates an opportunity for malicious actors to place malicious executables in directories that are searched by the service before the legitimate executable, thereby enabling unauthorized code execution with elevated privileges. The vulnerability directly relates to CWE-428 which describes the weakness of unquoted service paths, a well-documented security concern in Windows environments where services are improperly configured to execute binaries from directories that are not properly quoted.
When examining the operational impact of this vulnerability, attackers can leverage the unquoted service path to perform a privilege escalation attack that elevates their access level to SYSTEM level privileges. The service in question typically runs with elevated permissions, making this vulnerability particularly dangerous as it allows adversaries to execute malicious code with the highest possible system privileges. This flaw enables attackers to gain complete control over the affected system, potentially leading to data exfiltration, persistent backdoor installation, or further network reconnaissance activities. The attack vector is relatively straightforward as it requires only the ability to write to the directory containing the service executable, which often can be achieved through various means including existing user access or other initial compromise techniques.
The technical exploitation of this vulnerability aligns with several ATT&CK tactics including privilege escalation and persistence mechanisms. Specifically, the technique maps to ATT&CK tactic T1068 which covers local privilege escalation, and T1543 which addresses boot or logon initialization scripts and startup programs. The service path misconfiguration creates a predictable attack surface that adversaries can exploit to establish persistent access. Organizations should note that this vulnerability is not limited to HMA VPN specifically but represents a broader class of service configuration flaws that can be found across various Windows applications and services. The impact extends beyond just the immediate service, as the elevated privileges gained can be used to compromise other system components, modify security settings, or install additional malware.
Mitigation strategies for CVE-2022-26634 should focus on immediate remediation through proper service path quoting and comprehensive system auditing. Organizations must ensure that all service paths are properly quoted to prevent path traversal attacks, which involves modifying the service configuration to include quotation marks around directory paths containing spaces. Additionally, implementing least privilege principles for service accounts and regular security audits can help identify and remediate similar misconfigurations. The most effective long-term solution involves updating to the latest version of HMA VPN where this vulnerability has been addressed, while also conducting thorough vulnerability assessments of all installed services to identify and correct other potential unquoted path vulnerabilities. Security monitoring should include detection of unauthorized file modifications in service directories, particularly those that might indicate an attempt to exploit this specific vulnerability.