CVE-2025-27531
📋 TL;DR
This vulnerability allows authenticated attackers to read arbitrary files on Apache InLong servers through a deserialization flaw. It affects Apache InLong versions from 1.13.0 up to (but not including) 2.1.0. Attackers can exploit this by manipulating parameters to access sensitive system files.
💻 Affected Systems
- Apache InLong
📦 What is this software?
Inlong by Apache
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through reading sensitive files like configuration files, credentials, or SSH keys, potentially leading to lateral movement and data exfiltration.
Likely Case
Unauthorized access to sensitive configuration files, database credentials, or application secrets stored on the server.
If Mitigated
Limited impact if proper network segmentation and file permissions are in place, though sensitive data exposure remains possible.
🎯 Exploit Status
Exploitation requires authenticated access and parameter manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.0
Vendor Advisory: https://lists.apache.org/thread/r62lkqrr739wvcb60j6ql6q63rh4bxx5
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download Apache InLong 2.1.0 from official sources. 3. Stop the InLong service. 4. Replace with version 2.1.0. 5. Restart the service. 6. Verify functionality.
🔧 Temporary Workarounds
Restrict File Access Permissions
linuxLimit file system permissions to reduce impact of arbitrary file reads.
chmod 600 sensitive_files
chown root:root sensitive_files
Network Segmentation
allIsolate InLong instances from sensitive systems and limit network access.
🧯 If You Can't Patch
- Implement strict authentication controls and monitor for suspicious parameter manipulation.
- Deploy web application firewall (WAF) rules to detect and block deserialization attempts.
🔍 How to Verify
Check if Vulnerable:
Check Apache InLong version; if between 1.13.0 and 2.0.0 inclusive, it is vulnerable.Check Version:
Check application logs or configuration files for version information, or use 'curl' to query the service if an API endpoint exists.Verify Fix Applied:
Confirm version is 2.1.0 or higher and test parameter manipulation attempts are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual parameter values in requests
- Multiple failed file access attempts
- Authentication logs showing suspicious user activity
Network Indicators:
- HTTP requests with manipulated parameters targeting file paths
- Unusual outbound data transfers
SIEM Query:
source="apache_inlong" AND (param="*..*" OR param="*file*" OR param="*path*")