CVE-2025-24813: Critical RCE in Apache Tomcat

A high-severity vulnerability has been identified in Apache Tomcat, a widely-used open-source application server. This flaw could allow attackers to bypass security mechanisms, potentially leading to arbitrary code execution.

You Should Know:

1. Update Apache Tomcat:

Always ensure you are running the latest version of Apache Tomcat to mitigate vulnerabilities.
Command to check your current Tomcat version:
```
catalina.sh version
```
Upgrade Tomcat using your package manager (e.g., `apt` for Debian-based systems):
```
sudo apt update
sudo apt upgrade tomcat9
```

2. Temporary Mitigation Steps:

Disable write operations by setting the `readonly` parameter to `true` in conf/web.xml:

<init-param>
<param-name>readonly</param-name>
<param-value>true</param-value>
</init-param>

Disable the `PUT` method by setting `allowPartialPut` to `false` in web.xml:

<init-param>
<param-name>allowPartialPut</param-name>
<param-value>false</param-value>
</init-param>

3. Automate with Scripts:

Use the provided scripts from Vicarius to detect and remediate the vulnerability:
Detection Script: Download Here
Remediation Script: Download Here

4. Verify Changes:

Restart Tomcat to apply changes:
```
sudo systemctl restart tomcat9
```
Check Tomcat logs for errors:
```
tail -f /var/log/tomcat9/catalina.out
```

5. Additional Security Measures:

Use a firewall to restrict access to Tomcat ports (default: 8080):
```
sudo ufw allow 8080/tcp
sudo ufw enable
```
Regularly audit your server for unusual activity:
```
sudo netstat -tuln | grep 8080
```

What Undercode Say:

The CVE-2025-24813 vulnerability in Apache Tomcat is a critical issue that demands immediate attention. By updating your Tomcat installation, applying temporary mitigations, and automating the process with provided scripts, you can significantly reduce the risk of exploitation. Always stay proactive in securing your systems by monitoring logs, restricting access, and keeping your software up to date. For further assistance, refer to the official Apache Tomcat documentation.