Remote code execution in Cisco NX-OS

1) Files or directories accessible to external parties

EUVDB-ID: #VU50933

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-1361

CWE-ID: CWE-552 - Files or Directories Accessible to External Parties

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to the service at port 9075/tcp is incorrectly configured to listen and respond to external connection requests. A remote non-authenticated attacker can send specially crafted packets to port 9075/tcp and create, delete, or overwrite arbitrary files on the system with root privileges.

Successful exploitation of the vulnerability may results in a complete compromise of the affected system.

Mitigation

Install updates from vendor's website.

This vulnerability affects the following Cisco products if they are running Cisco NX-OS Software Release 9.3(5) or Release 9.3(6):

• Nexus 3000 Series Switches
• Nexus 9000 Series Switches in standalone NX-OS mode

Vulnerable software versions

Cisco NX-OS: 9.3.5 - 9.3.6

Cisco Nexus 3000 Series Switches: All versions

Cisco Nexus 9000 Series Switches NX-OS Mode: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_nx-os:9.3.5:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_nx-os:9.3.6:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_3000_series_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_nexus_9000_series_switches_nx-os_mode:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3000-9000-fileaction-QtLzDRy2
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw89875

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.