CVE-2025-67397: Passy v1.6.3 RCE Vulnerability

CVE-2025-67397 Overview

A critical command injection vulnerability has been identified in Passy v.1.6.3, a password management application. This security flaw allows a remote authenticated attacker to execute arbitrary commands on the affected system via a crafted HTTP request containing a specific payload injection. The vulnerability is classified under CWE-77 (Improper Neutralization of Special Elements used in a Command), indicating a failure to properly sanitize user-supplied input before passing it to system command execution functions.

Critical Impact

Authenticated attackers can achieve full system compromise through arbitrary command execution, potentially leading to complete takeover of the password manager and exposure of all stored credentials.

Affected Products

• Passy v.1.6.3

Discovery Timeline

• January 5, 2026 - CVE-2025-67397 published to NVD
• January 8, 2026 - Last updated in NVD database

Technical Details for CVE-2025-67397

Vulnerability Analysis

This command injection vulnerability in Passy v.1.6.3 stems from improper input validation in the HTTP request handling mechanism. When processing certain HTTP requests, the application fails to adequately sanitize user-controlled input before incorporating it into system command execution contexts. This allows an authenticated attacker to inject malicious command sequences that are executed with the privileges of the application process.

The attack requires network access and authenticated session credentials, but once these prerequisites are met, the exploitation complexity is low. The vulnerability has a scope change characteristic, meaning successful exploitation can impact resources beyond the vulnerable component itself, potentially affecting the entire host system and any connected services.

Root Cause

The root cause is improper neutralization of special elements used in command construction (CWE-77). The application incorporates user-supplied data from HTTP requests into system commands without adequate sanitization or escaping of command-relevant special characters. This allows attackers to break out of the intended command context and inject their own arbitrary commands for execution.

Attack Vector

The attack is conducted over the network by sending specially crafted HTTP requests to the vulnerable Passy application. The attacker must have valid authentication credentials to access the vulnerable endpoint. Once authenticated, the attacker can inject command payloads into specific request parameters that are processed by the application's backend command execution logic.

The vulnerability allows command injection through HTTP request manipulation. An authenticated attacker crafts a malicious HTTP request containing shell metacharacters or command separators (such as semicolons, pipes, or command substitution syntax) within a vulnerable parameter. When the application processes this request, it inadvertently executes the injected commands on the underlying system. Technical details and proof-of-concept information can be found in the GitHub CVE-2025-67397 Research repository.

Detection Methods for CVE-2025-67397

Indicators of Compromise

• Unusual HTTP requests to the Passy application containing shell metacharacters such as ;, |, $(), or backticks in request parameters
• Unexpected child processes spawned by the Passy application process
• Anomalous command execution or system calls originating from the web application context
• Authentication logs showing access followed by suspicious system activity

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing command injection patterns targeting the Passy application
• Monitor HTTP request logs for payloads containing common command injection characters and sequences
• Deploy endpoint detection and response (EDR) solutions to identify suspicious process chains originating from the Passy application
• Utilize SIEM correlation rules to link authenticated web sessions with subsequent anomalous system command execution

Monitoring Recommendations

• Enable detailed HTTP request logging for the Passy application to capture full request bodies and parameters
• Monitor system process creation events for child processes spawned by the Passy application with unexpected command-line arguments
• Implement network traffic analysis to detect unusual outbound connections following authenticated sessions
• Configure alerts for privileged command execution or file system modifications originating from the web application context

How to Mitigate CVE-2025-67397

Immediate Actions Required

• Restrict network access to the Passy application to trusted networks and users only
• Review and audit all authenticated user accounts for unauthorized access
• Consider temporarily disabling the affected functionality if a patch is not yet available
• Implement additional authentication controls and monitor for suspicious activity
• Apply network segmentation to limit the blast radius of potential compromise

Patch Information

Organizations should monitor the Passy official website for security updates and patch releases addressing this vulnerability. Additionally, the vulnerability research details available at the GitHub CVE-2025-67397 Research repository may provide further context on the issue.

Workarounds

• Implement strict input validation at the web application firewall level to filter requests containing command injection patterns
• Restrict access to the Passy application to internal networks only using firewall rules or VPN requirements
• Enable enhanced logging and monitoring to detect exploitation attempts
• Consider deploying the application in a containerized or sandboxed environment to limit the impact of successful exploitation
• Implement least privilege principles for the service account running the Passy application

# Example firewall rule to restrict access to Passy application
# Limit access to trusted internal networks only
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP