Authentication bypass in MikroTik RouterOS

Published: 2018-04-24 15:11:59 | Updated: 2018-05-20 11:04:12
Severity Critical
Patch available YES
Number of vulnerabilities 1
CVE ID N/A
CVSSv3 9.1 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C]
CWE ID CWE-287
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software MikroTik RouterOS
Vulnerable software versions MikroTik RouterOS 6.42
MikroTik RouterOS 6.41.4
MikroTik RouterOS 6.40.7
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Vendor URL MikroTik

Security Advisory

2018-04-25 - The bulletin was updated, added vulnerability details and information about in vulnerability exploitation in the wild, raised severity rating from High to Critical.
2018-05-20 - removed version 6.40.8 from list of vulnerable versions.

1) Improper authentication

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.

Remediation

Update to version 6.40.8 or 6.42.1.

External links

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

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