Routeros Authentication Bypass Vulnerability |verified|: Mikrotik

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Shodan query for potentially vulnerable WinBox instances (as of 2024):

This article explores the landscape of RouterOS authentication flaws, analyzes significant CVEs, and provides actionable steps to secure your devices. What is a MikroTik RouterOS Authentication Bypass?

Note: Real exploits require handling fragmentation (multiple packets) for files >4KB.

/ip service set winbox address=192.168.88.0/24 set www address=192.168.88.0/24 Use code with caution. Implement Firewall Filter Rules

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Understanding and Mitigating MikroTik RouterOS Authentication Bypass Vulnerabilities

Perhaps the most alarming aspect of CVE-2018-14847 is that it exposed a secondary, architectural weakness in older versions of RouterOS.

: A critical flaw in the Winbox service allowed remote attackers to bypass authentication and download the user.dat file, which contains the system's user database.

Once the attacker downloaded the user database, they could extract the password hashes (MD5) and crack them offline, or simply reuse the hash in a "pass-the-hash" style attack to log in via Winbox or WebFig.

An authentication bypass vulnerability occurs when a software system fails to properly verify the identity of a user or system attempting to access a service. In the context of , which runs the Winbox , WebFig , SSH , and API services, this means an attacker can bypass the login screen or manipulate network traffic to control the router without a username or password. These vulnerabilities often stem from:

3. CVE-2024-54772: Winbox User Enumeration/Authentication Bypass

One of the most critical authentication bypasses in RouterOS history, CVE-2018-14847

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