CVE-2023-39448
📋 TL;DR
This path traversal vulnerability in SHIRASAGI CMS allows authenticated attackers to manipulate server files by exploiting improper path validation. Attackers can create or modify arbitrary files, potentially leading to remote code execution. Organizations running SHIRASAGI versions before 1.18.0 are affected.
💻 Affected Systems
- SHIRASAGI
📦 What is this software?
Shirasagi by Ss Proj
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through arbitrary code execution, data theft, and persistent backdoor installation.
Likely Case
Website defacement, data manipulation, and limited code execution within the application context.
If Mitigated
Attackers can only access files within the intended directory structure if proper input validation is implemented.
🎯 Exploit Status
Exploitation requires authenticated access but path traversal vulnerabilities are typically straightforward to exploit once identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.18.0 and later
Vendor Advisory: https://www.ss-proj.org/support/954.html
Restart Required: Yes
Instructions:
1. Backup your SHIRASAGI installation and database. 2. Download SHIRASAGI v1.18.0 or later from the official repository. 3. Replace the existing installation with the updated version. 4. Restart the web server and application services.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement strict input validation for file path parameters to prevent directory traversal sequences.
# Requires code modification to validate and sanitize file path inputs
Access Restriction
allRestrict authenticated user permissions to minimize file system access.
# Configure application permissions to limit file write operations
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block path traversal patterns
- Restrict network access to SHIRASAGI instances and implement strict authentication controls
🔍 How to Verify
Check if Vulnerable:
Check SHIRASAGI version by examining the application's version file or admin interface.Check Version:
Check the version.txt file in the SHIRASAGI installation directory or use the admin dashboard.Verify Fix Applied:
Confirm installation of v1.18.0 or later and test file upload functionality with traversal attempts.📡 Detection & Monitoring
Log Indicators:
- Unusual file creation/modification patterns
- Multiple failed path traversal attempts in access logs
- Suspicious file paths containing '../' sequences
Network Indicators:
- HTTP requests with path traversal sequences in parameters
- Unexpected file uploads to unusual locations
SIEM Query:
source="web_logs" AND (uri="*../*" OR params="*../*") AND status=200