Listen to this Post
Threat actors are actively exploiting a critical vulnerability in Apache Tomcat, tracked as CVE-2025-24813, which could enable unauthorized remote code execution (RCE) on vulnerable servers. Attackers leverage a partial PUT method to inject malicious payloads, leading to arbitrary code execution. The root cause lies in how Apache Tomcat handles file paths during partial PUT requests.
🔗 Read more: https://lnkd.in/gZYEwWFN
You Should Know:
1. Verify Your Tomcat Version
Check if your Apache Tomcat is vulnerable by running:
$CATALINA_HOME/bin/version.sh # Linux .\bin\version.bat # Windows
If your version is below 10.1.20, you are at risk.
2. Immediate Mitigation Steps
- Disable PUT and DELETE methods in
web.xml:<security-constraint> <web-resource-collection> <url-pattern>/*</url-pattern> <http-method>PUT</http-method> <http-method>DELETE</http-method> </web-resource-collection> <auth-constraint /> </security-constraint>
- Block suspicious IPs using
iptables:iptables -A INPUT -p tcp --dport 8080 -s <MALICIOUS_IP> -j DROP
3. Patch or Upgrade
- Upgrade to Tomcat 10.1.20+:
wget https://downloads.apache.org/tomcat/tomcat-10/v10.1.20/bin/apache-tomcat-10.1.20.tar.gz tar -xzf apache-tomcat-10.1.20.tar.gz
- Apply backported patches if upgrading isn’t feasible.
4. Monitor Logs for Exploitation Attempts
grep -i "PUT" $CATALINA_HOME/logs/localhost_access_log.*
Look for unusual file uploads (e.g., `.jsp`, `.war`).
5. Enforce Strict File Permissions
chmod -R 750 $CATALINA_HOME/webapps/ chown -R tomcat:tomcat $CATALINA_HOME/
6. Disable AJP Connector (If Unused)
Edit `server.xml` and comment out:
<!-- <Connector protocol="AJP/1.3" ... /> -->
What Undercode Say:
Apache Tomcat remains a prime target due to misconfigurations and delayed patching. Beyond patching:
– Use a WAF (ModSecurity) to block exploit attempts.
– Restrict network access to Tomcat ports (8080, 8009).
– Deploy SIEM rules for anomaly detection (e.g., spikes in PUT requests).
– Test backups—assume compromise if unpatched.
Expected Output:
[+] Tomcat version 10.1.20 installed. [+] PUT/DELETE methods disabled. [+] Malicious IPs blocked via iptables. [+] Log monitoring active for exploit patterns.
Stay vigilant—attackers move faster than patches. 🚨
References:
Reported By: Cybersecurity News – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
