PT-2021-2491 · Mikrotik · Mikrotik Routeros

Published 2021-03-18 · Updated 2024-08-03 · CVE-2021-27221

Positive Technologies (AI Summary)

CVSS v2.0

8.5

High

Base vector

AV:N/AC:L/Au:S/C:N/I:C/A:C

Name of the Vulnerable Software and Affected Versions: MikroTik RouterOS version 6.47.9

Description: The issue allows remote authenticated ftp users to create or overwrite arbitrary .rsc files via the /export command. It is noted that the vendor considers this behavior as intended due to how user policies work. The vulnerability may allow a remote attacker to impact the integrity and availability of protected information.

Recommendations: For MikroTik RouterOS version 6.47.9, consider restricting access to the /export command for remote authenticated ftp users as a temporary workaround until the issue is resolved. Additionally, review user policies to ensure they are configured to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Command Injection

Weakness Enumeration

CWE-77

Related Identifiers

BDU:2021-01867

CVE-2021-27221

Affected Products

Mikrotik Routeros

References · 6

• 🔥 https://onovy.medium.com/routeros-user-with-just-ftp-policy-can-write-to-filesystem-cve-2021-27221-e3e45d780dfe · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-27221 · Security Note
• https://bdu.fstec.ru/vul/2021-01867 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27221 · Vendor Advisory
• https://t.me/cibsecurity/25169 · Telegram Post
• https://t.me/cvenotify/11557 · Telegram Post