CVE-2022-47925
📋 TL;DR
CVE-2022-47925 is an insufficient input validation vulnerability in the Secvisogram csaf-validator-service's JSON validation endpoint. Unauthenticated remote attackers can send specially crafted requests with unexpected test names, causing a partial denial-of-service that affects only the attacker's request. Organizations using Secvisogram csaf-validator-service versions below 0.1.0 are affected.
💻 Affected Systems
- Secvisogram csaf-validator-service
📦 What is this software?
Csaf Validator Lib by Csaf Validator Lib Project
⚠️ Risk & Real-World Impact
Worst Case
An attacker could repeatedly send malformed requests to the validate endpoint, causing resource exhaustion and service degradation for legitimate users attempting to validate CSAF documents.
Likely Case
Individual validation requests from attackers fail or timeout, but the overall service remains functional for other users with minimal performance impact.
If Mitigated
With proper input validation and request rate limiting, the service rejects malformed requests gracefully without resource consumption.
🎯 Exploit Status
Exploitation requires sending malformed JSON validation requests with unexpected test names to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.1.0
Vendor Advisory: https://wid.cert-bund.de/.well-known/csaf/white/2022/bsi-2022-0004.json
Restart Required: Yes
Instructions:
1. Stop the csaf-validator-service. 2. Update to version 0.1.0 or later. 3. Restart the service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Implement Input Validation Proxy
allDeploy a reverse proxy or WAF that validates JSON structure before forwarding to the vulnerable endpoint
# Configure nginx or similar proxy with JSON validation rules
Rate Limiting
allImplement request rate limiting on the validation endpoint to prevent DoS attempts
# Use web server or application-level rate limiting
🧯 If You Can't Patch
- Implement network segmentation to restrict access to the validation endpoint
- Deploy monitoring and alerting for repeated failed validation requests
🔍 How to Verify
Check if Vulnerable:
Check the service version; if running version < 0.1.0, it is vulnerable. Test by sending malformed JSON with unexpected test names to the validation endpoint.Check Version:
Check the service documentation or configuration for version information; typically via API endpoint or service logsVerify Fix Applied:
After updating to version 0.1.0+, verify that malformed requests with unexpected test names are properly rejected without causing service disruption.📡 Detection & Monitoring
Log Indicators:
- Multiple failed validation requests with unusual test names
- Increased error rates on /validate endpoint
- Request timeouts on validation operations
Network Indicators:
- Unusual traffic patterns to the validation endpoint
- Repeated POST requests with malformed JSON payloads
SIEM Query:
source="csaf-validator" AND (error OR timeout) AND endpoint="/validate"