CVE-2025-27452
📋 TL;DR
This vulnerability affects Apache httpd webservers running the MEAC300-FNADE4 web application with unnecessary modules enabled. It allows directory listing, potentially exposing sensitive files and directory structures. Organizations using the MEAC300-FNADE4 web application with default or insecure Apache configurations are affected.
💻 Affected Systems
- MEAC300-FNADE4 web application
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could enumerate directory contents, discover sensitive files (configuration files, backups, credentials), and potentially access restricted files leading to further exploitation.
Likely Case
Information disclosure through directory listing, exposing file names and directory structures that could aid attackers in planning further attacks.
If Mitigated
Limited information exposure with proper access controls and monitoring in place.
🎯 Exploit Status
Directory listing is a basic web server feature that can be accessed via standard HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://sick.com/psirt
Restart Required: Yes
Instructions:
1. Review Apache httpd configuration for the MEAC300-FNADE4 application
2. Disable unnecessary modules (particularly those enabling directory listing)
3. Restart Apache service
4. Verify directory listing is disabled
🔧 Temporary Workarounds
Disable Directory Listing in Apache
linuxConfigure Apache to prevent directory listing by modifying directory directives
Edit Apache configuration (e.g., /etc/httpd/conf/httpd.conf or site-specific config)
Add or modify: Options -Indexes
Restart Apache: systemctl restart httpd
Disable Unnecessary Modules
allRemove or comment out LoadModule directives for modules not required by MEAC300-FNADE4
Edit Apache configuration
Comment out unnecessary LoadModule lines: #LoadModule autoindex_module modules/mod_autoindex.so
Restart Apache
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block directory listing requests
- Use network segmentation to restrict access to affected systems
🔍 How to Verify
Check if Vulnerable:
Access web application directories without index files and check if directory listing is displayedCheck Version:
httpd -vVerify Fix Applied:
Attempt to access directories without index files and verify '403 Forbidden' or similar error appears instead of directory listing📡 Detection & Monitoring
Log Indicators:
- HTTP 200 responses to directory paths without index files
- Multiple GET requests to directory paths
Network Indicators:
- HTTP requests to directories without file extensions
- Pattern of requests exploring directory structures
SIEM Query:
source="apache_access" status=200 uri="/.*/$"🔗 References
- https://sick.com/psirt
- https://sick.com/psirt
- https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
- https://www.endress.com
- https://www.first.org/cvss/calculator/3.1
- https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.json
- https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0008.pdf
