CVE-2019-19825 : What You Need to Know

A vulnerability has been identified in certain TOTOLINK Realtek SDK based routers that allows attackers to bypass the CAPTCHA system and perform unauthorized actions on the router.

Understanding CVE-2019-19825

This CVE involves a security flaw in TOTOLINK Realtek SDK based routers that enables attackers to retrieve CAPTCHA text and potentially gain unauthorized access.

What is CVE-2019-19825?

The vulnerability in certain TOTOLINK Realtek SDK based routers allows attackers to bypass the CAPTCHA system by sending a specific POST request, leading to potential unauthorized access.

The Impact of CVE-2019-19825

The vulnerability enables attackers to retrieve CAPTCHA text, bypass the security measure, and perform various actions on affected routers using Basic Authentication.

Technical Details of CVE-2019-19825

This section provides detailed technical information about the vulnerability.

Vulnerability Description

By sending a POST request to the boafrm/formLogin URI with a specific parameter, attackers can retrieve CAPTCHA text, bypassing the security measure.

Affected Systems and Versions

The following TOTOLINK Realtek SDK based router models and firmware versions are affected:

A3002RU (up to version 2.0.0)
A702R (up to version 2.1.3)
N301RT (up to version 2.1.6)
N302R (up to version 3.4.0)
N300RT (up to version 3.4.0)
N200RE (up to version 4.0.0)
N150RT (up to version 3.4.0)
N100RE (up to version 3.4.0)

Exploitation Mechanism

Attackers exploit the vulnerability by sending a POST request to a specific URI, allowing them to retrieve CAPTCHA text and potentially gain unauthorized access.

Mitigation and Prevention

Protecting against and mitigating the CVE-2019-19825 vulnerability is crucial for maintaining the security of affected systems.

Immediate Steps to Take

Update router firmware to the latest version provided by the vendor.
Monitor network traffic for any suspicious activity.
Implement strong and unique passwords for router access.

Long-Term Security Practices

Regularly check for security updates and patches for the router.
Conduct security audits and penetration testing to identify vulnerabilities.
Educate users on best practices for securing their network devices.

Patching and Updates

Regularly check the vendor's website for security advisories and apply patches promptly to mitigate the vulnerability.