CVE-2024-55657
📋 TL;DR
CVE-2024-55657 is an arbitrary file read vulnerability in SiYuan personal knowledge management systems. Attackers can exploit the unvalidated path parameter in the /api/template/render endpoint to read sensitive files on the host system. All SiYuan instances running versions before 3.1.16 are affected.
💻 Affected Systems
- SiYuan Personal Knowledge Management System
📦 What is this software?
Siyuan by B3log
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through reading SSH keys, database credentials, configuration files, or other sensitive data leading to lateral movement or data exfiltration.
Likely Case
Unauthorized access to sensitive configuration files, user data, or system files containing credentials or personal information.
If Mitigated
Limited impact with proper network segmentation and file system permissions restricting access to critical files.
🎯 Exploit Status
The vulnerability requires no authentication and exploitation is straightforward via path traversal in the path parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.16
Vendor Advisory: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-xx68-37v4-4596
Restart Required: Yes
Instructions:
1. Stop the SiYuan service
2. Backup your data and configuration
3. Download and install version 3.1.16 from official sources
4. Restart the SiYuan service
5. Verify the update was successful
🔧 Temporary Workarounds
Block Vulnerable Endpoint
allUse web server or firewall rules to block access to the /api/template/render endpoint
# For nginx: location /api/template/render { deny all; }
# For Apache: <Location /api/template/render> Require all denied </Location>
Network Access Control
linuxRestrict network access to SiYuan to trusted IP addresses only
# Example iptables rule: iptables -A INPUT -p tcp --dport [SiYuan_port] -s [trusted_IP] -j ACCEPT
# Then: iptables -A INPUT -p tcp --dport [SiYuan_port] -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate SiYuan from sensitive systems
- Apply file system permissions to restrict access to sensitive files and directories
🔍 How to Verify
Check if Vulnerable:
Check if SiYuan version is below 3.1.16 and test if /api/template/render endpoint accepts path traversal payloadsCheck Version:
Check SiYuan web interface settings or look for version information in application logsVerify Fix Applied:
Confirm version is 3.1.16 or higher and test that path traversal attempts to the /api/template/render endpoint are properly rejected📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to /api/template/render endpoint
- Requests containing path traversal sequences (../, ..\, %2e%2e%2f)
- Access to files outside expected template directories
Network Indicators:
- HTTP requests to /api/template/render with suspicious path parameters
- Unusual file read patterns from the SiYuan server
SIEM Query:
source="siyuan.log" AND (uri_path="/api/template/render" AND (param=".." OR param="%2e%2e"))