CVE-2025-69620: Moo Chan Song Path Traversal Vulnerability

CVE-2025-69620 Overview

A path traversal vulnerability exists in Moo Chan Song v4.5.7 that enables attackers to write files to internal storage locations, resulting in a Denial of Service (DoS) condition. This vulnerability allows authenticated attackers with network access to exploit improper path validation, potentially filling up storage space or overwriting critical files to disrupt application availability.

Critical Impact

Attackers can leverage this path traversal flaw to write arbitrary files to internal storage, causing service disruption and potential data loss through storage exhaustion or file corruption.

Affected Products

• Moo Chan Song v4.5.7

Discovery Timeline

• 2026-02-04 - CVE-2025-69620 published to NVD
• 2026-02-05 - Last updated in NVD database

Technical Details for CVE-2025-69620

Vulnerability Analysis

This path traversal vulnerability (CWE-400: Uncontrolled Resource Consumption) in Moo Chan Song v4.5.7 occurs due to insufficient validation of user-supplied file paths before writing operations. The vulnerability allows attackers to manipulate file path parameters to escape the intended directory structure and write files to arbitrary locations within the application's accessible storage.

The attack requires the attacker to be authenticated and have network access to the vulnerable application. While user interaction is required to trigger the exploit, successful exploitation leads to complete loss of system availability. The vulnerability does not directly impact data confidentiality or integrity, but focuses on disrupting service through resource exhaustion.

Root Cause

The root cause stems from improper input validation on file path parameters during write operations. The application fails to properly sanitize or canonicalize user-supplied paths, allowing directory traversal sequences (such as ../) to be processed. This enables attackers to navigate outside the intended directory boundaries and write data to unintended storage locations, ultimately causing resource exhaustion that triggers a Denial of Service condition.

Attack Vector

The vulnerability is exploitable over the network by authenticated users. An attacker can craft malicious requests containing path traversal sequences to target specific storage locations. By repeatedly exploiting this flaw to write large amounts of data or targeting critical system paths, the attacker can exhaust storage resources or corrupt essential files, rendering the application unavailable.

The attack flow involves manipulating file path inputs to include traversal sequences that bypass directory restrictions. Once the path validation is bypassed, the attacker can direct file writes to sensitive storage areas, leading to storage exhaustion and subsequent service degradation or complete denial of service.

Detection Methods for CVE-2025-69620

Indicators of Compromise

• Unusual file write operations to system or application directories outside normal working paths
• Rapid increase in storage utilization without corresponding legitimate user activity
• Log entries showing file path parameters containing sequences like ../ or encoded variants
• Application errors or crashes related to storage exhaustion or file system issues

Detection Strategies

• Implement file integrity monitoring to detect unauthorized file creation or modification in sensitive directories
• Configure application logging to capture and alert on file path parameters containing traversal patterns
• Deploy network traffic analysis to identify requests with suspicious path manipulation attempts
• Monitor storage utilization metrics for abnormal consumption patterns

Monitoring Recommendations

• Enable detailed logging for all file write operations within the application
• Set up alerts for storage capacity thresholds to detect resource exhaustion attempts early
• Review web application firewall logs for blocked path traversal attempts
• Regularly audit file system changes in critical directories for unauthorized modifications

How to Mitigate CVE-2025-69620

Immediate Actions Required

• Restrict network access to the vulnerable Moo Chan Song application to trusted users only
• Implement input validation rules at the network perimeter to block requests containing path traversal sequences
• Enable storage monitoring and alerting to detect exploitation attempts
• Review and restrict file system permissions for the application to minimize writable directories

Patch Information

No vendor patch information is currently available for this vulnerability. Monitor the GitHub CVE Issue #11 and Fudan University Security Research pages for updates on remediation guidance.

Workarounds

• Implement a web application firewall (WAF) rule to block requests containing directory traversal patterns such as ../, ..%2f, and similar encoded variants
• Restrict the application's file system permissions to prevent writes outside designated directories
• Deploy rate limiting on file upload or write operations to slow down potential exploitation attempts
• Consider temporarily disabling affected file write functionality until a patch is available
• Isolate the application in a sandboxed environment with limited storage allocation to contain potential damage

# Example WAF rule to block path traversal attempts
# Add to your web application firewall configuration
SecRule REQUEST_URI|ARGS "@rx (\.\./|\.\.%2f|%2e%2e/|%2e%2e%2f)" \
    "id:100001,phase:1,deny,status:403,msg:'Path Traversal Attempt Blocked'"