Privilege escalation in Cisco Nexus 3000 and 9000 Series Switches

1) Improper Authorization

EUVDB-ID: #VU46099

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3394

CWE-ID: CWE-285 - Improper Authorization

Exploit availability: No

Description

The vulnerability allows a local user to bypass authorization checks.

The vulnerability exists due to a logic error in the implementation of the "enable" command in the Enable Secret feature. A local user can issue the "enable" command and get full administrative privileges on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Nexus 3000 Series Switches: before 9.3.4

Cisco Nexus 9000 Series Switches NX-OS Mode: 9.2.3 - 9.3.3

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3n9k-priv-escal-3QhXJBC

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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