CVE-2025-26692: Quick Agent Path Traversal Vulnerability

CVE-2025-26692 Overview

CVE-2025-26692 is a critical path traversal vulnerability affecting Quick Agent V3 and Quick Agent V2 software products. The vulnerability stems from improper limitation of a pathname to a restricted directory (CWE-22), allowing remote unauthenticated attackers to execute arbitrary code with Windows system privileges on affected systems.

This path traversal flaw enables attackers to bypass directory restrictions and access files outside the intended directory structure. When successfully exploited, an attacker can leverage this weakness to achieve remote code execution without requiring any authentication, making this a particularly severe vulnerability for organizations using the affected Quick Agent products.

Critical Impact

Remote unauthenticated attackers can execute arbitrary code with Windows system privileges, potentially leading to complete system compromise.

Affected Products

• Quick Agent V3
• Quick Agent V2

Discovery Timeline

• 2025-04-28 - CVE CVE-2025-26692 published to NVD
• 2025-04-29 - Last updated in NVD database

Technical Details for CVE-2025-26692

Vulnerability Analysis

This path traversal vulnerability exists due to insufficient input validation when handling file path parameters within the Quick Agent software. The application fails to properly sanitize user-supplied input containing directory traversal sequences such as ../ or ..\, allowing attackers to escape the intended directory boundaries.

The vulnerability is accessible over the network without requiring any prior authentication or user interaction. An attacker can craft malicious requests containing path traversal sequences to read, write, or execute files outside the application's restricted directory. Given that the Quick Agent software runs with Windows system privileges, successful exploitation grants the attacker the highest level of access on the target system.

The remote code execution capability makes this vulnerability particularly dangerous, as attackers can deploy malware, establish persistent backdoors, exfiltrate sensitive data, or pivot to other systems within the network.

Root Cause

The root cause is improper limitation of a pathname to a restricted directory (CWE-22). The Quick Agent application does not adequately validate or sanitize user-controllable input used to construct file paths, allowing directory traversal sequences to escape the intended directory structure and access arbitrary locations on the file system.

Attack Vector

The attack vector is network-based, allowing remote exploitation without authentication. An attacker can send specially crafted requests containing directory traversal sequences (such as ../ or ..\) to the Quick Agent service. These malicious path components enable the attacker to break out of the restricted directory and access or execute files elsewhere on the system. Since the service operates with system-level privileges on Windows, successful exploitation results in arbitrary code execution with the highest privilege level.

For detailed technical information, refer to the JVN #JVN82536398 Advisory and the SIOS Security Advisory.

Detection Methods for CVE-2025-26692

Indicators of Compromise

• Network requests to Quick Agent services containing path traversal sequences such as ../, ..\, %2e%2e%2f, or %2e%2e/
• Unexpected file access or modifications outside the Quick Agent application directory
• Suspicious process execution originating from the Quick Agent service with system privileges
• Anomalous network connections from the Quick Agent process to external or internal hosts

Detection Strategies

• Implement network intrusion detection rules to identify HTTP requests containing directory traversal patterns targeting Quick Agent endpoints
• Monitor file system activity for access to sensitive directories (e.g., C:\Windows\System32) by the Quick Agent process
• Configure endpoint detection and response (EDR) solutions to alert on suspicious child processes spawned by the Quick Agent service
• Review Windows Security event logs for anomalous privilege usage associated with the Quick Agent service account

Monitoring Recommendations

• Enable detailed logging for the Quick Agent application and centralize logs for analysis
• Deploy SentinelOne agents to monitor for behavioral indicators of path traversal exploitation and subsequent code execution
• Implement network segmentation and monitor traffic to/from systems running Quick Agent for anomalous patterns
• Establish baseline behavior for the Quick Agent service and alert on deviations

How to Mitigate CVE-2025-26692

Immediate Actions Required

• Identify all systems running Quick Agent V2 or Quick Agent V3 within your environment
• Apply vendor-provided security patches as soon as they become available from SIOS
• Restrict network access to Quick Agent services using firewall rules to limit exposure to trusted hosts only
• Monitor affected systems for signs of exploitation while awaiting patch deployment

Patch Information

SIOS has released security advisories and updates addressing this vulnerability. Organizations should consult the SIOS Support Article and the SIOS Agent Information page for the latest patch information and update instructions. Apply all available security updates to Quick Agent V2 and V3 installations immediately.

Workarounds

• Implement strict network access controls to limit connectivity to Quick Agent services to only trusted internal hosts
• Deploy web application firewall (WAF) rules or network filtering to block requests containing path traversal sequences
• Consider temporarily disabling or isolating Quick Agent services in high-risk environments until patches can be applied
• Enable enhanced monitoring and logging on affected systems to detect potential exploitation attempts

# Example: Restrict network access to Quick Agent service port using Windows Firewall
netsh advfirewall firewall add rule name="Restrict Quick Agent Access" dir=in action=allow protocol=tcp localport=<AGENT_PORT> remoteip=<TRUSTED_IP_RANGE>
netsh advfirewall firewall add rule name="Block Quick Agent Default" dir=in action=block protocol=tcp localport=<AGENT_PORT>