CVE-2025-9142: Harmony SASE Path Traversal Vulnerability

CVE-2025-9142 Overview

CVE-2025-9142 is a path traversal vulnerability (CWE-22) affecting the Check Point Harmony SASE Windows client. A local user can trigger the Harmony SASE Windows client to write or delete files outside the intended certificate working directory, potentially leading to privilege escalation, data manipulation, or system compromise.

Critical Impact

Local attackers with limited privileges can manipulate the file system beyond intended boundaries, potentially overwriting critical system files or deleting security configurations.

Affected Products

• Check Point Harmony SASE Windows Client

Discovery Timeline

• 2026-01-14 - CVE-2025-9142 published to NVD
• 2026-01-14 - Last updated in NVD database

Technical Details for CVE-2025-9142

Vulnerability Analysis

This path traversal vulnerability exists within the Check Point Harmony SASE Windows client's certificate handling functionality. The application fails to properly sanitize user-controlled input when processing file paths related to certificate operations. This allows an attacker to use directory traversal sequences (such as ../) to escape the intended certificate working directory and access arbitrary locations on the file system.

The vulnerability requires local access and user interaction to exploit, but if successfully exploited, the scope changes to affect resources beyond the vulnerable component. The attacker can achieve high impact across confidentiality, integrity, and availability by reading, writing, or deleting files outside the restricted directory structure.

Root Cause

The root cause is improper input validation (CWE-22) in the certificate file path handling logic. The application does not adequately validate or sanitize file path inputs before performing file operations, allowing specially crafted paths containing traversal sequences to reference files outside the intended certificate working directory.

Attack Vector

The attack requires local access to a system running the vulnerable Harmony SASE Windows client. An attacker with low privileges must craft malicious input that includes directory traversal sequences targeting the certificate handling functionality. User interaction is required to trigger the vulnerable code path. Once exploited, the attacker can:

1. Write arbitrary files to sensitive system locations, potentially achieving privilege escalation
2. Delete critical system or application files, causing denial of service
3. Overwrite security configurations to weaken system defenses

The vulnerability mechanism involves the certificate working directory functionality being manipulated through path traversal sequences. For complete technical details, refer to the Check Point Security Advisory.

Detection Methods for CVE-2025-9142

Indicators of Compromise

• Unusual file access patterns from the Harmony SASE client process targeting directories outside its normal working paths
• Unexpected file modifications or deletions in system directories that coincide with Harmony SASE client activity
• Log entries showing certificate-related operations with suspicious path patterns containing ../ sequences
• Changes to system files or configurations that occur when the SASE client is active

Detection Strategies

• Monitor file system activity from the Harmony SASE client process for access attempts outside the certificate working directory
• Implement file integrity monitoring (FIM) on critical system directories to detect unauthorized modifications
• Configure endpoint detection rules to alert on path traversal patterns in file operations
• Review Windows Security Event logs for suspicious file access patterns associated with the Harmony SASE process

Monitoring Recommendations

• Deploy SentinelOne's behavioral AI to detect anomalous file system operations from the Harmony SASE client
• Enable detailed file system auditing on Windows endpoints running the vulnerable software
• Configure alerts for file write or delete operations in sensitive system directories by the SASE client process
• Establish baseline file system activity patterns for the Harmony SASE client to identify deviations

How to Mitigate CVE-2025-9142

Immediate Actions Required

• Apply the latest security patches from Check Point as soon as they become available
• Restrict local user access to systems running the Harmony SASE Windows client to trusted users only
• Implement application whitelisting to prevent unauthorized execution alongside the SASE client
• Review and audit recent file system changes on affected systems for signs of exploitation

Patch Information

Check Point has published a security advisory addressing this vulnerability. Refer to the Check Point Security Advisory (sk184557) for official patch information, affected versions, and remediation guidance.

Workarounds

• Limit local user access to systems running the Harmony SASE client until patches can be applied
• Implement strict file system permissions to protect sensitive directories from unauthorized write or delete operations
• Deploy endpoint protection solutions like SentinelOne to detect and block exploitation attempts in real-time
• Consider temporarily disabling or restricting the certificate functionality if operationally feasible until the patch is applied

# Example: Restrict write permissions on sensitive directories (Windows PowerShell)
# Audit current permissions on critical system directories
icacls "C:\Windows\System32" /t /q
# Consider implementing additional ACLs to restrict write access from non-privileged users