CVE-2025-48388
📋 TL;DR
FreeScout help desk software prior to version 1.8.178 has an input validation vulnerability where special characters like carriage returns, newlines, and tabs can be passed to string formatting functions. This could allow attackers to manipulate application behavior or cause denial of service. All FreeScout instances running vulnerable versions are affected.
💻 Affected Systems
- FreeScout
📦 What is this software?
Freescout by Freescout
⚠️ Risk & Real-World Impact
Worst Case
Attackers could inject malicious content that disrupts application functionality, potentially causing denial of service or manipulating how data is displayed/processed.
Likely Case
Limited manipulation of application output or formatting, potentially causing minor display issues or application errors.
If Mitigated
Proper input validation would prevent any exploitation, resulting in no impact.
🎯 Exploit Status
Exploitation requires user interaction or authenticated access to input fields.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.8.178
Vendor Advisory: https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-c76f-wggm-grcq
Restart Required: Yes
Instructions:
1. Backup your FreeScout installation and database. 2. Download version 1.8.178 from the official repository. 3. Replace the existing installation with the new version. 4. Restart your web server and any related services.
🔧 Temporary Workarounds
Input Validation Filter
allImplement custom input validation to strip or escape special characters before processing.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block requests containing suspicious special character sequences.
- Restrict access to vulnerable endpoints to trusted users only and monitor for unusual input patterns.
🔍 How to Verify
Check if Vulnerable:
Check your FreeScout version via the admin panel or by examining the application files.Check Version:
Check the version in the FreeScout admin interface or look for version information in the application files.Verify Fix Applied:
After updating, verify the version shows 1.8.178 or higher and test input fields with special characters to ensure they're properly handled.📡 Detection & Monitoring
Log Indicators:
- Unusual input patterns containing \r, \n, \t sequences in user-submitted data
- Application errors related to string formatting or input processing
Network Indicators:
- HTTP requests containing unusual special character sequences in POST/PUT data
SIEM Query:
source="web_server_logs" AND (message="*\\r*" OR message="*\\n*" OR message="*\\t*")