Vulnerability identifier: #VU59129

Vulnerability 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

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
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:

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

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External links
http://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtml

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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.