CVE-2025-59784: 2N Access Commander Log Pollution Flaw

CVE-2025-59784 Overview

CVE-2025-59784 is a log pollution vulnerability affecting 2N Access Commander version 3.4.1 and prior. The vulnerability stems from improper log output neutralization (CWE-117), where certain parameters sent over the API may be included in application logs without prior validation or sanitization. While this vulnerability requires administrator-level authentication to exploit, it can lead to log integrity issues, potential log injection attacks, and complicate forensic analysis efforts.

Critical Impact

Authenticated administrators can inject arbitrary content into system logs, potentially hiding malicious activities, corrupting audit trails, or exploiting log analysis tools.

Affected Products

• 2N Access Commander version 3.4.1 and prior
• 2N Access Commander version 3.x releases

Discovery Timeline

• 2026-03-04 - CVE-2025-59784 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2025-59784

Vulnerability Analysis

This vulnerability falls under CWE-117 (Improper Output Neutralization for Logs), a class of security flaws where user-controlled input is written to log files without adequate sanitization. In the context of 2N Access Commander, an access control management platform, certain API parameters are logged directly without proper validation, allowing authenticated administrators to inject arbitrary content into the application logs.

The attack requires network access to the vulnerable application and valid administrator credentials. Once authenticated, an attacker can craft malicious API requests containing specially formatted payloads that, when logged, could be used to forge log entries, inject false audit records, or potentially exploit vulnerabilities in log parsing and analysis tools.

Root Cause

The root cause of CVE-2025-59784 is insufficient input validation and output encoding in the logging subsystem of 2N Access Commander. API parameters received from authenticated administrator sessions are written directly to log files without neutralizing special characters or control sequences. This allows malicious input to manipulate log structure, inject newline characters to create fake log entries, or include control characters that may affect log viewers and SIEM systems.

Attack Vector

The attack vector is network-based, requiring the attacker to authenticate to the 2N Access Commander API with administrator privileges. Once authenticated, the attacker can submit specially crafted parameters through API endpoints that are subsequently logged by the application. The malicious content persists in log files and can impact log integrity, forensic investigations, and downstream log processing systems.

Since no verified code examples are available, the general exploitation pattern involves sending API requests with parameters containing newline characters, log format strings, or other control sequences designed to manipulate the log output. Attackers may inject fake timestamps, user identifiers, or action descriptions to mask their activities or frame other users.

Detection Methods for CVE-2025-59784

Indicators of Compromise

• Unusual or malformed log entries in 2N Access Commander application logs
• Log entries containing unexpected newline characters or control sequences
• Inconsistent timestamps or formatting anomalies in audit logs
• Multiple log entries appearing with identical timestamps but different user attributions

Detection Strategies

• Implement log integrity monitoring to detect unexpected changes or anomalies in log file structure
• Deploy SIEM rules to identify log entries with suspicious formatting patterns or control characters
• Enable detailed API request logging at the network or WAF level to correlate with application logs
• Monitor for administrator accounts making unusual API calls, particularly with large or encoded parameter values

Monitoring Recommendations

• Establish baseline logging patterns and alert on deviations in log entry format or frequency
• Configure file integrity monitoring (FIM) on 2N Access Commander log directories
• Review administrator API activity for anomalous request patterns or parameter content
• Ensure centralized logging with tamper-evident storage to preserve log integrity for forensic analysis

How to Mitigate CVE-2025-59784

Immediate Actions Required

• Upgrade 2N Access Commander to version 3.5 or later, which addresses this vulnerability
• Review administrator accounts and ensure principle of least privilege is enforced
• Audit existing logs for signs of potential exploitation or log manipulation
• Implement network segmentation to limit API access to trusted management networks only

Patch Information

2N has released a security update to address this vulnerability. Users should upgrade to 2N Access Commander version 3.5 or later. Detailed patch information and guidance is available in the 2N CVE-2025-59784 Document.

Workarounds

• Restrict network access to the 2N Access Commander management interface using firewall rules or VPN
• Implement strict access controls limiting administrator privileges to essential personnel only
• Enable enhanced logging at the network layer to maintain an independent audit trail
• Consider deploying a Web Application Firewall (WAF) to filter malicious API parameters before they reach the application