CVE-2025-47784
📋 TL;DR
Emlog versions 2.5.13 and prior contain a deserialization vulnerability where a user can craft a malicious nickname to cause deserialization failure. This could potentially lead to remote code execution or other security impacts. All Emlog installations using vulnerable versions are affected.
💻 Affected Systems
- Emlog
📦 What is this software?
Emlog by Emlog
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or website defacement.
Likely Case
Denial of service through deserialization failure, potentially disrupting website functionality.
If Mitigated
Limited impact if proper input validation and user privilege controls are implemented.
🎯 Exploit Status
Exploitation requires user account creation or modification privileges to set malicious nickname.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit 9643250802188b791419e3c2188577073256a8a2
Vendor Advisory: https://github.com/emlog/emlog/security/advisories/GHSA-f56g-m99v-mqc3
Restart Required: No
Instructions:
1. Update Emlog to version after commit 9643250802188b791419e3c2188577073256a8a2
2. Apply the patch from the GitHub commit
3. Verify the fix by testing nickname functionality
🔧 Temporary Workarounds
Disable user registration
allPrevent new users from creating accounts with malicious nicknames
Input validation filter
allImplement server-side validation to reject nicknames containing problematic characters
🧯 If You Can't Patch
- Implement strict input validation for nickname fields
- Restrict user registration and nickname modification capabilities
🔍 How to Verify
Check if Vulnerable:
Check Emlog version in admin panel or by examining source files for version markers.Check Version:
Check admin panel or examine emlog version files in installation directoryVerify Fix Applied:
Verify that commit 9643250802188b791419e3c2188577073256a8a2 is present in the installation.📡 Detection & Monitoring
Log Indicators:
- Failed deserialization attempts
- Unusual nickname patterns in user registration logs
Network Indicators:
- HTTP requests with crafted nickname parameters
SIEM Query:
Search for user registration events with unusual nickname patterns or deserialization errors