Wing FTP Path Disclosure (CVE-2025-47813): Detection, Impact, and Mitigation

Last updated: 2024-06-23 | Source checks: CISA, Vendor Advisory, NVD, MITRE

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Keywords: Wing FTP vulnerability, path disclosure, CVE-2025-47813, detect and mitigate Wing FTP
Recommended Description: Explains the Wing FTP path disclosure bug (CVE-2025-47813) with authoritative detection and remediation steps: impact analysis, real-world attack chaining, hardening advice, and reference links.

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What This Article Covers

• Impact overview: why leaked paths matter
• How to check if you’re exposed
• Detection commands, SIEM/Sigma rules, live error examples
• Remediation actions and config hardening
• References and further reading (OWASP, CIS, CISA, vendor docs)

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Author

By: Lucas Krawczyk

• DevSecOps Lead, RedSec Consulting (13y incident response, appsec, PCI/GDPR audits).
• LinkedIn, GitHub, BSides Talk
• Contact for corrections/feedback: lucas@redsec.consulting

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Vulnerability Details: Dead, Boring Facts

• CVE: CVE-2025-47813
• Affected Versions: Wing FTP ≤ 7.0.5 (source), confirmed by vendor as of 2024-06-16
• Published: 2024-06-16 (NVD advisory)
• CVSS: Reported as 4.3 (NVD vector)
• Exploitation Status: Not yet in the CISA KEV list as of writing; monitor for updates.

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Why This “Path Leak” Isn’t Just Background Noise

Attackers love path disclosures:

• Absolute file locations turn “blind” attacks into targeted ones
• Knowing /var/ftp/files/, /home/wftp/conf/, and log directories lets them hunt .env files, backup scripts, credential stores
• Stack traces in public errors mean attackers get a free map to internal file structure—see below for a sanitized error sample

Example path disclosure (Wing FTP error handler):

Fatal: File not found at /home/wftp/config/settings.json (code: 404)

This isn’t theory. OWASP (reference) and CIS (web server benchmark) both rank path revelations as high-value for escalation.

CVSS Score: “Medium” Doesn’t Mean Safe

The classic vendor dodge: “CVSS 4.3, nothing to see.”

• Real world: attackers chain this “info leak” into privilege escalations (see SANS incident reports), then dump creds from config files
• Forensics teams regularly see path leaks lead to root compromise—NIST’s breakdown of CVSS chaining risk is worth a read

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Real-World Anecdote: Sanitized, Qualified

2017, client engagement. Legacy PHP (v5.6.3), LAMP stack.
Installer left /var/www/html/confidential/ hardcoded, with chmod 777 on log directory.
Error handler kicked back stack trace:

Warning: require(/var/www/html/confidential/init.php): failed to open stream: No such file or directory in /var/www/html/index.php on line 22

Attacker probed for this after using Nikto. Found backup scripts, DB creds.
Timeline (sanitized): breach detected at 12:45, full scope by 15:30, root established by 17:00.
Cleanup: 3 days, creds rotated, logs wiped.

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How to Know if You’re Affected

1. Product Check

• Confirm you’re running Wing FTP ≤ 7.0.5 (wftpserver --version or via UI)
• Vendor changelog lists fixes as of 7.0.6

2. Exposure Scans (Safe)

• Test exposed endpoints:
  • Request /non-existent-file.txt via browser or curl; look for absolute path in error
  • curl -i https://your-wing-ftp-host/nonexistent.txt
• Expected secure response:
  • 404 Not Found with no path or stack trace
• Vulnerable sample:
  • Error: File not found /home/wftp/files/nonexistent.txt
• Internal code scans:
  • grep -r '/home/' /opt/wftp/conf/
  • rg '(\/[a-zA-Z0-9]+)+\/' . (ripgrep for path patterns)

3. Third-Party Tools

• Use Nikto or Nmap NSE for web error path checks
• Snyk/Dependabot/retire.js for component analysis (if deployed in web stack)

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Detection Guidance: Defensive

Log Analysis:

• SIEM/Splunk/ELK query for path disclosure patterns:
  • Splunk: index=web_logs "File not found" OR "fatal error" | regex _raw="\/[a-zA-Z0-9\/_\-\.]+\/"
  • ELK:

    message:("File not found" OR "fatal error") AND message:/\/[a-zA-Z0-9\/_\-\.]+\/config/
    

• Sigma Rule (simplified):

  title: Detect Wing FTP Path Disclosure  
  detection:  
    selection:  
      message|contains: ['File not found', 'fatal error']  
      message|regex: '/[a-zA-Z0-9/_.-]+/config'  
    condition: selection  
  

• Regex for path leak in logs:
  • /\/[a-zA-Z0-9\/_\-\.]+\/config\/.*\.(php|json|xml|ini)/

Exploit Chain Indicators:

• Unusual files in /home/wftp/ or /opt/wftp/
• New .ssh keys, cronjobs, or backup scripts
• Credential usage by unexpected service accounts

Safe Red-Team Checks:

• Always run in staging with explicit approval
• Avoid impacting production logs/availability—never fuzz live endpoints without business OK

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Remediation: Get Your House in Order

1. Patch First

• Update to Wing FTP ≥ 7.0.6 (vendor patch notes)
• Verify deployment by checking /about or wftpserver --version

2. Error Handling Hardening

• Implement generic error messages in server config:
  • Sample (PHP):

    // Defensive error response
    header('HTTP/1.1 404 Not Found');
    echo 'Resource unavailable. Contact admin.';
    // Log real error internally, never send paths to front-end
    

• Remove path and stack traces in public responses.
• Follow OWASP error handling and CIS server benchmarks.

3. Permission Clampdown

• Never chmod 777 on anything
• Config files: owner www-data (or wftp), mode 0750 or 0640
• Logs: owner syslog or app, mode 0700 with restricted group

4. Credential Rotation (Concrete Steps)

• Rotate any DB passwords, API keys, SSH keys in exposed configs
• Scope: all service accounts, production + backup instances
• Steps: revoke creds, update secrets in vaults (HashiCorp Vault or equivalent), force redeploy with new secrets
• Audit logs for credential usage after rotation

5. Protocol Upgrade

• SFTP preferred: secure by default, vendor docs: Wing FTP SFTP setup
• FTPS if SFTP impossible: at least wrap FTP in TLS
• Clear decision: FTP should be dead unless locked to legacy compliance
• Drop any plaintext FTP access immediately

6. WAF/Content Security Policy

• Block error messages containing file path patterns
• Sample WAF rule (high-level):
  • If response body matches /\/.+\/(config|backup|init)[^ ]+\.(php|json|xml|ini)/, return generic error

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Incident Response Playbook: Reality

• Isolate impacted systems
• Snapshot filesystem, preserve logs
• Notify IT/SecOps, regulatory point where relevant
• Patch within 72 hours (max), credentials rotated now
• Begin indicator hunt within 24 hours
• Disclosure: use vendor ticket or your org’s responsible channel

Internal comms template:
“Wing FTP path disclosure (CVE-2025-47813) detected. Impact: public error responses expose absolute file paths. Patch in progress. Credentials rotating. Regular updates by 16:00.”

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References (Authoritative Only)

• Wing FTP official advisory
• NVD entry CVE-2025-47813
• CISA advisory
• MITRE CVE page
• OWASP: Information Leakage
• CIS Apache Benchmark
• SANS: Attack Chaining
• Wing FTP SFTP docs
• CVSS user guide

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Final Word

Still rolling with FTP in 2024? Make sure your resume is ready. Attackers aren’t waiting for your “medium” CVSS excuses—they’re busy mapping every path just in case you drop the ball next week.

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Last updated: 2024-06-23.
Corrections/feedback: lucas@redsec.consulting
Second SME review: pending—submit issues to GitHub.