Zero-day vulnerability in MikroTik RouterOS

Stack-based buffer overflow

Remote code execution exploit was revealed during Vault 7 leak. It is possible, that this vulnerability was used to compromise Mikrotik routers in Slingshot APT campaign.

Known malware:

ChimayRed

Vulnerability details

Advisory: SB2017030703 - Remote code execution in Mikrotik RouterOS HTTP server

Vulnerable component: MikroTik RouterOS

CVE-ID:

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C

CWE-ID: CWE-121 - Stack-based buffer overflow

Description:

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

The vulnerability exists due to a boundary error within the HTTP server component. A remote attacker can send a specially crafted HTTP POST request to the affected device and trigger stack-based buffer overflow.

Successful exploitation of the vulnerability may allow an attacker to execute arbitrary code on the target system.

Note: this vulnerability was disclosed in the "Vault 7" leak by Wikileaks project. The codename of the exploit affecting Mikrotik RouterOS is ChimayRed.

External links:

https://wikileaks.org/ciav7p1/cms/page_16384604.html

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.