Zero-Day Advisory

Fortinet Discovers MikroTik RouterOS Authenticated Arbitrary File Deletion Vulnerability

Summary

Fortinet's FortiGuard Labs has discovered an authenticated arbitrary file deletion vulnerability in MikroTik's RouterOS.

RouterOS is an operating system based on the Linux kernel, which implements functionalities normally used by Internet Service Providers (ISPs). RouterOS, supported by MikroTik and its user community, provides a wide variety of configuration examples. RouterOS is embedded in MikroTik's RouterBOARD product line, focused on small- and medium-sized internet access providers that typically provide broadband access in remote areas.

An authenticated arbitrary file deletion vulnerability exists in the MikroTik's RouterOS through 6.44.5 and 6.45.x through 6.45.3. Successful exploitation of this vulnerability would allow a remote authenticated attacker to delete arbitrary file on the system, which could lead to privilege escalation.

Solutions

Users should apply patch provided by MikroTik

Timeline

Fortinet reported the vulnerability to MikroTik on 14 August, 2019.

MikroTik confirmed and fixed the vulnerability on 14 August, 2019.

MikroTik released patch for the vulnerability on 22 August, 2019 in the 6.46beta34 release.

Acknowledgement

This vulnerability was discovered by Tin Duong of Fortinet's FortiGuard Labs

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.