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MikroTik WinBox Man-in-the-Middle Password Hash Disclosure

Medium

Synopsis

Version 6.43 of RouterOS included a changelog indicating:

!) winbox - improved authentication process excluding man-in-the-middle possibility;

The change involved the RouterOS WinBox interface (port 8291) switching the key agreement algorithm from a Diffie-Hellman implementation to an ECSRP-5 implementation. While the ECSRP-5 implementation is immune to man-in-the-middle attacks, a man in the middle can still downgrade the WinBox client to the Diffie-Hellman implementation. After the DH key exchange the client will send the attacker their username and the their MD5 hashed password (the hash is salted with an attacker defined salt).

A proof of concept has been uploaded to our research GitHub repository.

Solution

As of publication time, no solution currently exists.

Disclosure Timeline

10/15/2019 - Tenable discloses. 90 day is Jan. 14, 2020.
10/17/2019 - MikroTik acknowledges and indicates there is no plan to patch in 90 day time frame.
10/17/2019 - Tenable reiterates disclosure will occur on Jan 14.
10/17/2019 - MikroTik acknowledges.
01/14/2020 - Tenable sends a final reminder.

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Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2019-3981
Tenable Advisory ID: TRA-2020-01
Credit:
Jacob Baines
CVSSv2 Base / Temporal Score:
4.3 / 4.1
CVSSv2 Vector:
AV:N/AC:M/Au:N/C:P/I:N/A:N
Affected Products:
RouterOS 6.43 and above
WinBox 3.20 and below
Risk Factor:
Medium

Advisory Timeline

01/14/2020 - [R1] Initial Release