CVE-2026-30281 Overview
An arbitrary file overwrite vulnerability has been identified in MaruNuri LLC v2.0.23. This vulnerability allows attackers to overwrite critical internal files via the file import process, potentially leading to arbitrary code execution or sensitive information exposure. The flaw stems from improper handling of external file paths during the import functionality, classified under CWE-73 (External Control of File Name or Path).
Critical Impact
Attackers can exploit the file import process to overwrite critical application files, potentially achieving arbitrary code execution or exposing sensitive information without requiring authentication.
Affected Products
- MaruNuri LLC v2.0.23
Discovery Timeline
- March 31, 2026 - CVE-2026-30281 published to NVD
- April 1, 2026 - Last updated in NVD database
Technical Details for CVE-2026-30281
Vulnerability Analysis
This vulnerability exists in the file import functionality of the MaruNuri LLC application. The application fails to properly validate or sanitize file paths provided during the import process, allowing an attacker to specify arbitrary file paths. This path traversal weakness enables malicious actors to write attacker-controlled content to locations outside the intended directory structure.
The vulnerability can be exploited remotely without requiring any authentication or user interaction. Successful exploitation allows attackers to overwrite configuration files, application binaries, or other sensitive system files. By targeting specific files, an attacker could achieve code execution by replacing executable files or scripts that the application subsequently loads and runs.
Root Cause
The root cause of CVE-2026-30281 is CWE-73: External Control of File Name or Path. The application accepts user-supplied input to determine file paths during the import operation without implementing adequate validation or path canonicalization. This allows attackers to use path traversal sequences or absolute paths to write files to arbitrary locations on the filesystem.
Attack Vector
The attack is network-based, requiring no privileges or user interaction. An attacker can craft malicious import requests containing manipulated file paths. When the application processes these requests, it writes the imported content to the attacker-specified location, potentially overwriting critical files.
The attacker could target:
- Application configuration files to modify behavior
- Executable files or libraries to inject malicious code
- System files to escalate privileges or maintain persistence
- Sensitive data files to cause information disclosure or corruption
For detailed technical information regarding this vulnerability, refer to the GitHub Issue #21 published by Secsys-FDU researchers.
Detection Methods for CVE-2026-30281
Indicators of Compromise
- Unexpected modifications to application configuration files or binaries
- File write operations to directories outside the normal application scope
- Suspicious import requests containing path traversal sequences (../) or absolute paths
- Newly created or modified files in system directories that coincide with application import activity
Detection Strategies
- Monitor file system activity for write operations outside designated import directories
- Implement application-level logging for all file import operations, capturing the full file path
- Deploy file integrity monitoring (FIM) on critical application and system files
- Analyze network traffic for import requests containing suspicious path patterns
Monitoring Recommendations
- Enable detailed audit logging for the MaruNuri LLC application's import functionality
- Configure alerts for any file modifications in protected directories
- Review import activity logs regularly for anomalous patterns or unauthorized access attempts
- Implement real-time monitoring for path traversal indicators in application input
How to Mitigate CVE-2026-30281
Immediate Actions Required
- Restrict access to the file import functionality to trusted users only
- Implement network-level controls to limit access to the vulnerable application
- Deploy web application firewall (WAF) rules to block path traversal attempts
- Consider temporarily disabling the file import feature until a patch is available
- Review and audit recent import activity for signs of exploitation
Patch Information
No vendor patch information is currently available. Monitor the MaruNuri website and the Google Play App Listing for security updates. Organizations should contact MaruNuri LLC directly for remediation guidance.
Workarounds
- Implement strict input validation on all file import paths, rejecting any traversal sequences
- Use allowlisting to restrict import destinations to specific, predefined directories
- Apply the principle of least privilege to the application's file system permissions
- Deploy application sandboxing to limit the impact of potential file overwrites
# Example: Restrict application file permissions
# Limit write access to only the designated import directory
chmod 755 /app/import_directory
chown appuser:appgroup /app/import_directory
# Ensure application runs with minimal privileges
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
