PT-2021-3959 · Mikrotik · Routeros+1

Cq674350529 + 1 · Published 2021-05-04 · Updated 2021-07-30 · CVE-2020-20262

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mikrotik RouterOs versions prior to 6.47

Description The issue is related to an assertion failure vulnerability in the /ram/pckg/security/nova/bin/ipsec process. An authenticated remote attacker can cause a Denial of Service due to an assertion failure via a crafted packet. The vulnerability is associated with the use of the assert() function or a similar operator, allowing a remote attacker to exploit it and cause a service disruption.

Recommendations For versions prior to 6.47, update to version 6.47 or later to resolve the issue. As a temporary workaround, consider restricting access to the /ram/pckg/security/nova/bin/ipsec process to minimize the risk of exploitation.

Exploit

Fix

DoS

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

BDU:2021-04478

CVE-2020-20262

Affected Products

Mikrotik Routeros

Routeros

References · 6

• 🔥 https://github.com/cq674350529/pocs_slides/blob/master/pocs/MikroTik/vul_ipsec/README.md · Exploit
• 🔥 https://seclists.org/fulldisclosure/2021/May/2 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-20262 · Security Note
• https://bdu.fstec.ru/vul/2021-04478 · Security Note
• https://osv.dev/vulnerability/CVE-2020-20262 · Vendor Advisory
• https://t.me/cvenotify/18351 · Telegram Post