Denial of service in Cisco Network Services Orchestrator

1) Path traversal

EUVDB-ID: #VU71102

Risk: Medium

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20040

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation in the NETCONF service when uploading packages to device. A remote user can upload a specially crafted package file and write files to arbitrary locations or delete arbitrary files on the system, resulting in a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco Network Services Orchestrator (NSO): before 5.8.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nso-path-trvsl-zjBeMkZg
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCwb11065

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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