CVE-2024-56200
📋 TL;DR
This vulnerability in Altair (a Misskey fork) allows unauthenticated attackers to abuse the image proxy feature to cause denial of service. Attackers can send specially crafted requests that trigger excessive CPU usage and network load, potentially making the server unavailable. All users running affected versions of Altair are at risk.
💻 Affected Systems
- Altair (Misskey fork)
⚠️ 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 unavailability due to resource exhaustion, potentially affecting all services on the same host and causing extended downtime.
Likely Case
Degraded server performance, increased response times, and potential service interruptions during attack periods.
If Mitigated
Minimal impact with proper rate limiting, request validation, and resource monitoring in place.
🎯 Exploit Status
Exploitation requires no authentication and minimal technical skill due to lack of request validation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v12.24Q4.1
Vendor Advisory: https://github.com/nexryai/altair/security/advisories/GHSA-3pfm-hp96-pfgv
Restart Required: Yes
Instructions:
1. Backup your Altair instance and database. 2. Update to v12.24Q4.1 using your package manager or by downloading from the official repository. 3. Restart the Altair service. 4. Verify the update was successful.
🧯 If You Can't Patch
- Implement strict rate limiting on image proxy endpoints
- Deploy a WAF with request validation rules for image processing endpoints
🔍 How to Verify
Check if Vulnerable:
Check if your Altair version is earlier than v12.24Q4.1 by examining the version in your installation directory or configuration files.Check Version:
Check your Altair installation directory for version files or examine package manager output (e.g., 'apt list --installed | grep altair' on Debian-based systems).Verify Fix Applied:
Confirm the version is v12.24Q4.1 or later and test that image proxy requests now require proper authentication and validation.📡 Detection & Monitoring
Log Indicators:
- Unusually high number of image proxy requests from single IPs
- Spikes in CPU usage correlated with image processing requests
- Failed authentication attempts on image proxy endpoints
Network Indicators:
- High volume of requests to /api/proxy/image or similar endpoints
- Unusual patterns in image URL parameters
SIEM Query:
source="altair.logs" AND (uri_path="/api/proxy/image" OR uri_path="/proxy/image") AND request_count > 1000 per src_ip per hour