Multiple vulnerabilities in Zyxel GS1900, XGS1210 and XGS1250 series switches



Published: 2022-01-03
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-35031
CVE-2021-35032
CWE-ID CWE-78
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe 		GS1900-8
Hardware solutions / Routers & switches, VoIP, GSM, etc

XGS1210-12
Hardware solutions / Routers & switches, VoIP, GSM, etc

XGS1250-12
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-8HP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-10HP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-16
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24E
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24EP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24HP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-24HPv2
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-48
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-48HP
Hardware solutions / Routers & switches, VoIP, GSM, etc

GS1900-48HPv2
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) OS Command Injection

EUVDB-ID: #VU59128

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35031

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 user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the TFTP client. A local user 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 updates from vendor's website.

Vulnerable software versions

GS1900-8: before 2.70

XGS1210-12: before 1.00

XGS1250-12: before 1.00

External links

http://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.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) OS Command Injection

EUVDB-ID: #VU59129

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35032

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 user to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the libsal.so. A local user 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 updates from vendor's website.

Vulnerable software versions

GS1900-8HP: before 2.70

GS1900-10HP: before 2.70

GS1900-16: before 2.70

GS1900-24E: before 2.70

GS1900-24EP: before 2.70

GS1900-24: before 2.70

GS1900-24HP: before 2.70

GS1900-24HPv2: before 2.70

GS1900-48: before 2.70

GS1900-48HP: before 2.70

GS1900-48HPv2: before 2.70

External links

http://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.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.



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