CVE-2025-4893
📋 TL;DR
This critical path traversal vulnerability in jammy928 CoinExchange_CryptoExchange_Java allows attackers to write arbitrary files to server directories by manipulating filename parameters in the uploadLocalImage function. Remote attackers can potentially overwrite critical system files or deploy malicious payloads. All deployments using this cryptocurrency exchange software up to commit 8adf508b996020d3efbeeb2473d7235bd01436fa are affected.
💻 Affected Systems
- jammy928 CoinExchange_CryptoExchange_Java
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through arbitrary file write leading to remote code execution, data theft, or system destruction.
Likely Case
Unauthorized file upload to sensitive directories, potentially enabling web shell deployment or configuration file modification.
If Mitigated
Limited impact with proper file permission restrictions and input validation preventing directory traversal.
🎯 Exploit Status
Proof of concept publicly available on GitHub; simple path traversal attack requiring minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - product doesn't use versioning
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Manually fix the uploadLocalImage function in UploadFileUtil.java to validate and sanitize filename inputs before processing.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to reject filename parameters containing path traversal sequences
Implement Java filter to check for '../', '..\\', and other traversal patterns in filename parameter
Web Application Firewall Rule
allBlock requests containing path traversal patterns in filename parameters
WAF rule: deny requests where filename parameter contains '../', '..\\', or absolute paths
🧯 If You Can't Patch
- Disable the file upload endpoint completely if not required
- Implement strict file permission restrictions on server directories
🔍 How to Verify
Check if Vulnerable:
Test by attempting to upload a file with filename parameter containing '../' sequences to the upload endpointCheck Version:
Check git commit hash: git log --oneline -1Verify Fix Applied:
Verify that path traversal attempts are rejected and files cannot be written outside intended directories📡 Detection & Monitoring
Log Indicators:
- HTTP requests with filename parameters containing '../' or '..\\'
- File write operations outside expected upload directories
- Unusual file creation in system directories
Network Indicators:
- POST requests to upload endpoints with suspicious filename parameters
- Multiple failed upload attempts with traversal patterns
SIEM Query:
source="web_logs" AND (filename="*../*" OR filename="*..\\*") AND uri="*/upload*"