CVE-2025-62618
📋 TL;DR
This vulnerability in ELOG allows authenticated users to upload HTML files that execute in other users' contexts, potentially stealing credentials. It affects ELOG versions before 3.1.5-20251014. The issue is mitigated in the latest release where HTML files are rendered as plain text.
💻 Affected Systems
- ELOG
📦 What is this software?
Elog by Elog Project
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains administrative access by stealing and cracking password hashes, leading to complete system compromise and data exfiltration.
Likely Case
Attackers steal user credentials through crafted HTML files, enabling unauthorized access to sensitive logs and data.
If Mitigated
With proper access controls and monitoring, impact is limited to isolated credential theft attempts that are detected and contained.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward via HTML file uploads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.5-20251014
Vendor Advisory: https://elog.psi.ch/elog/download/RPMS/?C=M;O=D
Restart Required: Yes
Instructions:
1. Download ELOG version 3.1.5-20251014 from the vendor site. 2. Backup current configuration. 3. Install the update following OS-specific package procedures. 4. Restart the ELOG service.
🔧 Temporary Workarounds
Disable HTML file uploads
allConfigure ELOG to block HTML file uploads via server settings.
Modify elogd.cfg to set 'Allow HTML uploads = 0'
Restrict user upload permissions
allLimit file upload capabilities to trusted users only.
Adjust user permissions in elogd.cfg to restrict 'upload' privileges
🧯 If You Can't Patch
- Implement strict access controls to limit authenticated users who can upload files.
- Deploy web application firewalls (WAF) to block malicious HTML content and monitor for suspicious uploads.
🔍 How to Verify
Check if Vulnerable:
Check ELOG version; if earlier than 3.1.5-20251014 and HTML uploads are allowed, it is vulnerable.Check Version:
elogd --version or check package manager (e.g., rpm -q elog)Verify Fix Applied:
After patching, confirm version is 3.1.5-20251014 and test that uploaded HTML files render as plain text.📡 Detection & Monitoring
Log Indicators:
- Unusual HTML file uploads by authenticated users
- Failed login attempts following uploads
Network Indicators:
- HTTP requests containing username/password hashes to unexpected destinations
SIEM Query:
source="elog" AND (event="file_upload" AND file_type="html")🔗 References
- https://bitbucket.org/ritt/elog/commits/7092ff64f6eb9521f8cc8c52272a020bf3730946
- https://bitbucket.org/ritt/elog/commits/f81e5695c40997322fe2713bfdeba459d9de09dc
- https://elog.psi.ch/elog/download/RPMS/?C=M;O=D
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-304-01.json
- https://www.cve.org/CVERecord?id=CVE-2025-62618
