Authentication bypass in MikroTik RouterOS

1) Improper authentication

EUVDB-ID: #VU12140

Risk: Critical

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-14847

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to improper authentication in the exposed by default Winbox interface on port 8291/TCP. A remote attacker can send specially crafted packets to the affected service, bypass authentication, download local database with user accounts and gain full access to the vulnerable device.

Successful exploitation of the vulnerability may result in system compromise.

Note: this vulnerability has being exploited in the wild in April 2018.

Mitigation

Update to version 6.40.8 or 6.42.1.

Vulnerable software versions

MikroTik RouterOS: 6.36.4 - 6.42

External links

http://mikrotik.com/download/changelogs/
http://forum.mikrotik.com/viewtopic.php?f=21&t=133533

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.