OS Command Injection in NEC Storage M Series NAS Gasteway

1) OS Command Injection

EUVDB-ID: #VU54214

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20740

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in Hitachi File Services Manager. A remote authenticated attacker can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

NEC Storage M Series NAS Gasteway Nh4c/Nh8c: before FOS 6.4.3-08(NEC3.4.2)

NEC Storage M Series NAS Gasteway Nh4b/Nh8b: before FOS 6.4.3-08(NEC3.4.2)

NEC Storage M Series NAS Gasteway Nh4a/Nh8a: before FOS 5.5.3-08(NEC2.5.4a)

CPE2.3

• cpe:2.3:h:nec_corporation:nec_storage_m_series_nas_gasteway_nh4c_nh8c:*:*:*:*:*:*:*:*
• cpe:2.3:h:nec_corporation:nec_storage_m_series_nas_gasteway_nh4b_nh8b:*:*:*:*:*:*:*:*
• cpe:2.3:h:nec_corporation:nec_storage_m_series_nas_gasteway_nh4a_nh8a:*:*:*:*:*:*:*:*

External links

https://jvn.jp/en/jp/JVN21298724/index.html
https://jpn.nec.com/security-info/secinfo/nv21-011.html

Q & A

Can this vulnerability be exploited remotely?

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

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.

Is there known malware, which exploits this vulnerability?

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