CVE-2025-5509
📋 TL;DR
This critical vulnerability in quequnlong shiyi-blog allows remote attackers to perform path traversal attacks via the /api/file/upload endpoint. By manipulating the file/source parameter, attackers can write files to arbitrary locations on the server. All users running shiyi-blog version 1.2.1 or earlier are affected.
💻 Affected Systems
- quequnlong shiyi-blog
📦 What is this software?
Shiyi Blog by Quequnlong
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Unauthorized file writes to sensitive directories, potentially enabling web shell deployment or data manipulation
If Mitigated
Limited file system access restricted to non-critical directories with proper input validation
🎯 Exploit Status
Public exploit details are available in GitHub repositories, making exploitation straightforward
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider alternative software or implement workarounds.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to reject path traversal sequences in file upload parameters
Implement Java filter to sanitize 'file/source' parameter before processing
Web Application Firewall Rule
allBlock requests containing path traversal patterns to the vulnerable endpoint
WAF rule: Block requests to /api/file/upload containing '../', '..\\', or similar traversal patterns
🧯 If You Can't Patch
- Disable or restrict access to the /api/file/upload endpoint
- Implement strict file upload restrictions and store files outside web root with random names
🔍 How to Verify
Check if Vulnerable:
Test if the /api/file/upload endpoint accepts file paths containing '../' sequences in the file/source parameterCheck Version:
Check application version in configuration files or via application metadataVerify Fix Applied:
Verify that path traversal attempts are rejected with proper error messages and no file writes occur📡 Detection & Monitoring
Log Indicators:
- Multiple failed upload attempts with '../' patterns
- Unusual file write operations to system directories
Network Indicators:
- HTTP POST requests to /api/file/upload with traversal sequences in parameters
SIEM Query:
source="web_logs" AND uri_path="/api/file/upload" AND (param="../" OR param="..\\")🔗 References
- https://github.com/uglory-gll/javasec/blob/main/shiyi-blog.md
- https://github.com/uglory-gll/javasec/blob/main/shiyi-blog.md#1file-path-traversal
- https://vuldb.com/?ctiid.310923
- https://vuldb.com/?id.310923
- https://vuldb.com/?submit.584488
- https://github.com/uglory-gll/javasec/blob/main/shiyi-blog.md
