Denial of service in MikroTik RouterOS



Published: 2020-09-15 | Updated: 2020-09-21
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-11881
CWE ID CWE-129
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe
MikroTik RouterOS
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor MikroTik

Security Advisory

Updated 21.09.2020

Added fixed version.

1) Improper Validation of Array Index

Risk: Medium

CVSSv3: 6.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-11881

CWE-ID: CWE-129 - Improper Validation of Array Index

Exploit availability: Yes [Search exploit]

Description

The vulnerability allows a remote attacker to perform denial of service attack.

The vulnerability exists due to improper validation of array index when processing setup-requests in a built-in SMB server. A remote non-authenticated attacker can send specially crafted setup-request packets and crash the SMB server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

MikroTik RouterOS: 6.41.3, 6.41.4, 6.42, 6.42.1, 6.42.2, 6.42.3, 6.42.4, 6.42.5, 6.42.6, 6.42.7, 6.42.9, 6.42.10, 6.42.11, 6.42.12, 6.43, 6.43.1, 6.43.2, 6.43.3, 6.43.4, 6.43.5, 6.43.6, 6.43.7, 6.43.8, 6.43.9, 6.43.10, 6.43.11, 6.43.12, 6.43.13, 6.43.14, 6.43.15, 6.43.16, 6.44, 6.44.1, 6.44.2, 6.44.3, 6.44.4, 6.44.5, 6.44.6, 6.45, 6.45.1, 6.45.2, 6.45.3, 6.45.4, 6.45.5, 6.45.6, 6.45.7, 6.45.8, 6.45.9, 6.46, 6.46.1, 6.46.2, 6.46.3, 6.46.4, 6.46.5, 6.46.6, 6.46.7, 6.47, 6.47.1, 6.47.2, 6.47.3

CPE External links

https://github.com/botlabsDev/CVE-2020-11881

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?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.