Multiple vulnerabilities in Zyxel Armor home routers



Published: 2022-02-23
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-4029
CVE-2021-4030
CWE-ID CWE-78
CWE-79
Exploitation vector Network
Public exploit N/A
Vulnerable software
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NBG6816 (Armor Z1)
Hardware solutions / Firmware

NBG6817 (Armor Z2)
Hardware solutions / Firmware

Vendor ZyXEL Communications Corp.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) OS Command Injection

EUVDB-ID: #VU60816

Risk: Low

CVSSv3.1: 7.3 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-4029

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 local attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A local attacker can execute arbitrary OS commands on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NBG6816 (Armor Z1): All versions

NBG6817 (Armor Z2): before 1.00(ABCS.11)C0

External links

http://www.zyxel.com/support/forgery-vulnerabilities-of-select-Armor-home-routers.shtml


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.

Is there known malware, which exploits this vulnerability?

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

2) Cross-site scripting

EUVDB-ID: #VU60817

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-4030

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the HTTP daemon. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NBG6816 (Armor Z1): All versions

NBG6817 (Armor Z2): before 1.00(ABCS.11)C0

External links

http://www.zyxel.com/support/forgery-vulnerabilities-of-select-Armor-home-routers.shtml


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.



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