Multiple vulnerabilities in Moxa TN-5900

Published: 2022-02-07

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-46559 CVE-2021-46560
CWE-ID	CWE-354 CWE-78
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	TN-5900 Hardware solutions / Routers & switches, VoIP, GSM, etc
Vendor	Moxa

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper validation of integrity check value

EUVDB-ID: #VU60349

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-46559

CWE-ID: CWE-354 - Improper Validation of Integrity Check Value

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass integrity checks.

The vulnerability exists due to a weak algorithm. A remote authenticated attacker can upload abritrary code in a crafted firmware image simply by replacing a CRC value in the image header.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

TN-5900: 3.1.0

External links

http://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerabilities

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.

2) OS Command Injection

EUVDB-ID: #VU60350

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-46560

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