Authentication bypass in Arista Metamako Operating System (MOS)

1) Improper Authentication

EUVDB-ID: #VU109361

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-28495

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests in JSON-RPC API. A remote attacker can bypass authentication process and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Arista Metamako Operating System (MOS): before 0.26.7

CPE2.3

• cpe:2.3:o:arista:mos:*:*:*:*:*:*:*:*

External links

https://www.arista.com/en/support/advisories-notices/security-advisories/12914-security-advisory-66

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.