CVE-2023-31456
📋 TL;DR
This SSRF vulnerability in Fluid Topics allows authenticated users to force the server to make arbitrary HTTP requests to internal and external resources. It affects Fluid Topics versions prior to 4.3, potentially enabling attackers to probe internal networks or interact with internal services.
💻 Affected Systems
- Fluid Topics
⚠️ 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
Attackers could access sensitive internal services, exfiltrate data from internal systems, or chain with other vulnerabilities to achieve remote code execution.
Likely Case
Information disclosure from internal services, reconnaissance of internal network infrastructure, or interaction with cloud metadata services.
If Mitigated
Limited to authenticated users only, with network segmentation preventing access to critical internal systems.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once authenticated
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.3 and later
Vendor Advisory: https://doc.fluidtopics.com/r/Fluid-Topics-Release-Notes/June-10th-2024
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download Fluid Topics version 4.3 or later from official sources. 3. Follow upgrade instructions in release notes. 4. Restart Fluid Topics services. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict outbound network access from Fluid Topics servers to only necessary external resources
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP
Authentication Restriction
allLimit user accounts with access to vulnerable functionality
🧯 If You Can't Patch
- Implement strict network egress filtering to prevent SSRF requests to internal resources
- Apply principle of least privilege to user accounts and monitor for suspicious SSRF patterns
🔍 How to Verify
Check if Vulnerable:
Check Fluid Topics version via admin interface or configuration files. If version is below 4.3, system is vulnerable.Check Version:
Check admin dashboard or review installation documentation for version informationVerify Fix Applied:
Confirm version is 4.3 or higher and test SSRF functionality is blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from Fluid Topics server
- Requests to internal IP addresses or cloud metadata endpoints
Network Indicators:
- HTTP traffic from Fluid Topics server to unexpected internal destinations
- Requests to 169.254.169.254 (AWS metadata) or similar
SIEM Query:
source="fluid-topics" AND (dest_ip=10.* OR dest_ip=172.16.* OR dest_ip=192.168.* OR dest_ip=169.254.169.254)